| images Front cover top Agate from Germany; bottom Agate from Scotland. Back cover Agate from Germany. Title...Title page Agate from Russian Arctic coast. Distribution NBN International Estover Road Devon PL6 7PY ... Contents Introduction Names of agates What is an agate? Properties of agates Sources of agates Europe...different geological environments. Since the mid-1900s, agate collecting has become very popular in Europe, North...America and the Middle East. There are thousands of _agate_-producing areas on Earth, and in the following pages |
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Pabian, Roger, Jackson, Brian, Tandy, Peter, Cromartie, John (2006) Agates - Treasures of the Earth. Natural History Museum, London. |
Book |
| Images Front cover top Agate from Germany: bottom Agate from Scotland. Back cover Agate from Germany. Title...Title page Agate from Russian Arctic coast. Distribution NBN International Estover Road Devon PL6 ?PY UK...Introduction 4 Names of agates 6 What is an agate? 10 Properties of agates 44 Sources of agates...geological environments. Si nce the mid-1900s, agate collecting has become very popular in Europe, North...America and the M iddle East. There are thousands of _agate_-producing areas on Earth, and in the following pages |
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Schumann, Walter (1998) Minerals of the World. Sterling Publishing Company, Inc., New York. 224pp. |
Book |
| vitreous (glassy), waxy, and resinous as brous, or dendritic minerals, as well as all well as silky, mother-of-pearl...left by a seashell), uneven, smooth, fibrous, dendritic, hook-shaped, splintery, crumbly (like crumbled...Tibet/China; Kashmir/Pakistan/ India; Kazakhstan/USSR; Iran. Similar to: kernite, colemanite, sassolite, soda...cleavage surface silky to mother-of-pearl. Fracture: dendritic, splintery, brittle. Flame test: yellow. Crystals:...crevices. Aggregates: granular, rough, dense, seldom dendritic; found in po- 44 tassium hydroxide salt deposits |
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Schumann, Walter (1998) Minerals of the World. Sterling Publishing Company, Inc., New York. 224pp. |
Book |
| thin the sample might be. Granular, fibrous, or dendritic minerals, as well as all aggregates, are always...left by a seashell), uneven, smooth, fibrous, dendritic, hook-shaped, splintery, or crumbly (like crumbled...Tibet/China; Kashmir/Pakistan/ India; Kazakhstan/USSR; Iran. Similar to: kernite, _colemanite, sassolite, soda...cleavage surface silky to mother-of-pearl. Fracture: dendritic, splintery, brittle. Flame test: yellow Crystals:...crevices. Aggregates: granular, rough, dense, seldom dendritic; found in potassium hydroxide salt deposits, with |
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Schumann, Walter (1998) Minerals of the World. Sterling Publishing Company, Inc., New York. 224pp. |
Book |
| thin the sample might be. Granular, fibrous, or dendritic minerals, as well as all aggregates, are always...Tibet/China; Kashmir/Pakistan/ India; Kazakhstan/USSR; Iran. Similar to: kernite, colemanite, sassolite, soda... Aggregates: granular, rough, dense, seldon1 dendritic; found in potassium hydroxide salt deposits, with...Erfurt/Germany; Galicia and Catalonia/Spain; Urals/USSR; Iran, Libya; Saskatchewan/Canada: New Mexico, Texas,...crystals unknown in nature. Aggregates: granular, dendritic, acicular, as a crust and dusting; present in |
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(2011, April) Gems & Gemology Vol. 47 (1) Gemological Institute of America |
Journal (issue) |
| Vietnam • Gem zektzerite • “Coral Sea” agate • Dendritic agate in doublets and jewelry • Diamond mining...2011 61 SYNTHETICS AND SIMULANTS “Coral Sea” agate. At the AGTA show, Bill Heher (Rare Earth Mining...were marketed as Coral Sea agate (figure 15). Formed of natural lace agate from Oregon on a reconstituted...Figure 16. The profile view of this 16 × 25 mm agate doublet reveals its quartz cap. Composite photo...15. Doublets of lace agate and reconstituted turquoise, sold as Coral Sea agate, often resemble coral |
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Schumann, Walter (1998) Minerals of the World. Sterling Publishing Company, Inc., New York. 224pp. |
Book |
| thin the sample migh t be. Granular, fibrous, or dendritic minerals, as well as all aggregates, are always...left by a seashell), uneven, smooth, fibrous , dendritic, hook-shaped, splintery, or crumbly (like crumbled...Tibet/China; Kashmir/Pakistan/ India; Kazakhstan/USSR; Iran. Similar to: kernite, colemanite, sassolite, soda...cleavage surface silky to mother-of-pearl. Fracture: dendritic, splintery, brittle. Flame test: yellow. Crystals:...crevices. Aggregates: granular, rough, dense, seldom dendritic; found in potassium hydroxide salt deposits, with |
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Mason, Anita (1976) The World of Rocks and Minerals. Larousse & Co., Inc., New York. |
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| 53 Barytes Chalcedony 54 Wulfenite Agate 55 Moss agate 56 Chrysoprase Cornelian Jasper 57 58...Such druses are in particular a rich source of agate and amethyst. Another rich source of minerals is...Common form Coarse to fine wiry; platy or scaly; dendritic; massive; rarely in cubic, octahedral or dodecahedral...golden-yellow. Opaque. Metallic. Wiry; platy or scaly; dendritic; small grains or nodules, occasionally large nuggets;...minerals described on pages 55 to 61. 54 Name Agate. Chemical composition Silicon dioxide. (Variety |
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Schumann, Walter (2009) Gemstones of the World (4th ed.) Sterling Publishing Co., Inc., New York. |
Book (edition) |
| 69 Engraving on Stones 70 Cutting and Polishing Agate 71 Cutting and Polishing Colored Stones Cabochon...Lazuli 144 190 Sodalite 144 Dendritic Agate 146 114 Chrysoberyl Moss Agate 146 116 Spinel Layer Stones...Stones g 190 Azurite 192 Malachite Agate 148 Ti 176 180 Feldspar Group Chrysoprase Precious Beryl...for its green color), their place of discovery (“_agate_” for a river in Sicily), or mysterious powers (“amethyst”...Thaumasite Vanadinite Wurizite Zincite trigonal Agate Achroite Amethyst Amethyst Quartz Ametrine Ankerite |
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Schumann, Walter (1999) Gemstones of the World (2nd ed.) Sterling Publishing Co., Inc., New York. |
Book (edition) |
| Properties of Gemstones Cutting and Polishing Agate 60 Hardness 19 Cutting and Polishing Colored Stones...Chrysoprase 128 Heliotrope 128 Dendritic Agate 130 Moss Agate 130 Agate 132 Jasper 146 Fossilized Wood...term colored stones all precious stones except agate and diamond. Colored Precious Stone (also for ...for its green color), their place of discovery ("agate" for a river in Sicily), or mysterious powers ("amethyst"...Staurolite Kornerupine Titanite Pyrope Senarmontite Agate Amethyst Lithiophilite Tremolite Manganotanitalite |
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Schumann, Walter (2006) Gemstones of the World (3rd ed.) Sterling Publishing Co., Inc., New York. |
Book (edition) |
| Production of Gemstones oS 70 Cutting and Polishing Agate 71 Cutting and Polishing Colored Stones _ Cabochon...Rhodochrosite Dendritic Agate 146 184 Rhodonite Pyrope 120 Kimandite 120 Moss Agate 146 Agate 148 : 186...for its green color), their place of discovery (“_agate_” for a river in Sicily), or mysterious powers (“amethyst”...Thaumasite Vanadinite Wurizite Zincite trigonal Agate Achroite Amethyst Amethyst Quartz Ametrine Ankerite...Chrysoprase Citrine Cinnabar Corundum Davidite Dendritic Agate Dioptase Dolomite Dravite Elbaite Eudialyte |
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(1999) Essential Colored Stone Reference Guide. Gemological Institute of America (GIA), Carlsbad, CA. |
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| Reprinted 2005 Table of Contents Introduction Agate Alexandrite Almandite Amber Amethyst Aquamarine...GIA. All rights reserved. 1 Agate Agate/Chalcedony Carved agate Agate is a fine-grained chalcedony...beautiful cameos. The characteristic that sets agate apart from other chalcedonies is its appearance:...cabochons, beads, and carvings. Fire agate is a relative newcomer to the agate family, discovered in the 1940s...Eye agate, orbicular agate Landscape agate Fire agate Dendritic agate, scenic agate Iris agate Banded |
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Schumann, Walter, Schumann, Walter (1977) Gemstones of the World (1st ed.) Sterling Publishing Co., Inc. |
Book (edition) |
| Engraving on stones 54 Cutting and polishing agate 55 Cutting and polishing colored stones Cutting...its green color), to their place of discovery ("agate" after a river in Sicily), and lastly to their alleged...malachite and azurite Hessonite garnet Pyrope garnet Agate pseudomorphous after coral Cracked rock crystal...aventurine quartz Cinnamon stone Colorado ruby Coral agate Craquelees Cross stone Cymophane Danburite Daourite...starstone Greens tone Hawaiite Heliocite Iceland agate Imperial jade Inca stone Indian jade J2 Commercial |
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Polk, Patti (2010) Collecting Rocks, Gems and Minerals: Identification, Values and Lapidary Uses (1st ed.) Krause Publications. |
Book (edition) |
| holding a shiny crystal or an expertly polished agate in their hands. It is even more gratifying to actually...The search for a lustrous crystal or a colorful agate is truly a worthwhile and satisfying recreational...lonely journeys to find that ever-elusive next agate, jasper, or mineral specimen that will be the most...within the field of the lapidary arts. A rough agate as found in the field weighing about three pounds...pounds. A silver ring set with a freeform agate cabochon hand collected, cut, and polished by the author |
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(2011, July) Sussex Mineral and Lapidary Society Journal 232. SMLS |
Journal (issue) |
| countries including Chile, Brazil, Sweden, Russia, Iran and Mongolia. He collects minerals so he has had...foreign (Botswana and America) rhodonite, dendritic agate and jasper, which all had great colour and...listing of all the entries but they ranged from agate nodules from Ayrshire (submitted by Donald Barratt...made up from two different minerals (French Tarn Agate and Sussex fossiliferous flint) cut as interlocking |
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(2014) Mineral Collections in Texas (A Supplement to the Sept-Oct issue) The Mineralogical Record Vol. 45 (5.1) The Mineralogical Record, Inc. |
Journal (issue) |
| tracking down different species from areas across Iran. Copper (spinel-law twin), 5.4 cm, from the ltauz...Province, Iran. Joe Budd photo. Cerussite, 3.5 cm, from the Nakhlak mine, Esfahan Province, Iran. Joe Budd...Province, Iran. Joe Budd photo. Mimetite, 6.2 cm, from the Chah Mileh mine, Esfahan Province, Iran. Joe Budd...every interesting piece of rock I could find from agate to obsidian . This interest led me into geology...Fernando Brugos collection; Joe Budd photo. Laguna agate, 5 cm, from Ojo Laguna, Chihuahua, Mexico. Bruce |
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White, John Sampson (1991) Minerals and Gems - The Smithsonian Treasury. Smithsonian Institution Press, Washington, D. C. |
Book |
| apart as granules are, of course, granular. A dendritic habit describes minerals whose crystals branch...one. Pyrite that looks like sand dollars and dendritic, or treelike, manganese oxide minerals are more...dissolved nutrients to permit the crystals to grow. Dendritic crystals of the mineral Solenhofen, Bavaria, Germany...the swan was carved in Germany in banded, dyed agate. 51 THE WORLD OF GEMSTONES The pendant dazzling...amethyst, citrine, spodumene, garnet, rose quartz, and agate. In addition, Brazil is also known for opal, emerald |
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White, John Sampson (1991) Minerals and Gems - The Smithsonian Treasury. Smithsonian Institution Press, Washington, D. C. |
Book |
| apart as granules are, of course, granular. A dendritic habit describes minerals whose crystals branch...one. Pyrite that looks like sand dollars and dendritic, or treelike, manganese oxide minerals are more...dissolved nutrients co permit the crystals to grow. Dendritic crystals of the mineral psilomelane, from Solenhofen...the swan was carved in Germany in banded, dyed agate. 51 THE WORLD OF GEMSTONES The dazzling pendant...amethyst, citrine, spodumene, garnet, rose quartz, and agate. In addition, Brazil is also known for opal, emerald |
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Shipley, Robert M. (1974) Dictionary of Gems and Gemology (6th ed.) Gemological Institute of America, Los Angeles. |
Book (edition) |
| from India, ground for use as Agate. achates. Ancient name for agate. Free achromatic from color;...green tourmaline. See African emerald. Moss agate. agate (ageg’-it). One of the many varieties of chalcedony...(onyx) and in a translucent form with dendritic inclusions (moss agate). It is found in virtually all colors...translucent to semitransparent. Most gray-banded agate is African emerald. Emerald from the Transvaal...Trade dyed to onyx, moss agate and improve its color. See agate. jasper. Mixture of jasper chalcedony |
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MacFall, Russell P. (1969) Gem Hunter's Guide (4th ed.) Thomas Y. Crowell Company, New York. |
Book (edition) |
| Chrysocolla, Turquoise LJ Emerald, Beryl ^"^ Agate ** Jade Amethyst nq -* % Gem Hunter's...color, as in emeralds; their pattern, as in moss agate; or their play of eral color, as in opals. Fashion... such as agate and jasper, are described as cryptocrystal- line. For example, an agate nodule may...cat's- more but inexhaustibly various patterns of agate and jasper. So typical are their patterns that.../ 13 tion (with angular, banded structure), dendritic (mossy), poppy (red spotted), or show banded, |
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Arem, Joel (1973) Rocks and Minerals. Geoscience Press, Inc. |
Book (edition) |
| desert regions of the U.S. Loc: Chile; Italy; Egypt; Iran; India; Spain; U.S.S.R. BORATES The boron atom...Siberia; France (Montebras); Chile (Chuquicamata); Iran; New Mexico; Arizona; Virginia (Lynch Station)—crystals...as carnelian (red), chrysoprase (apple-green), agate (banded or with moss-like inclusions), chalcedony...Uses of quartz include 100 Above: Dendritic Agate (I. top); Agate (I. bottom); Quartz (Amethyst). ...pyrite and other silicates. Fine material comes from Iran and Chile. LEUCITE forms characteristic isometric |
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Arem, Joel (1973) Rocks and Minerals. Bantam. |
Book (edition) |
| desert regions of the U.S. Loc: Chile; Italy; Egypt; Iran; India; Spain; U.S.S.R. BORATES The boron atom...(Montebras); Chile (Chuquicamata); Station)—crystals. Iran; New Mexico; Arizona; Virginia (Lynch VARISCITE...materials, such as carchrysoprase (apple-green), agate (banded or with moss-like chalcedony (fibrous and...Uses of quartz include 100 Above: Dendritic Agate (I. top); Agate (I. bottom); Quartz (Amethyst). Opposite:...always associated with pyrite and other silicates. Iran and Chile. Fine material comes from LEUCITE forms |
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Newman, Renée (2001) Gem & Jewelry Pocket Guide. |
Book |
| quality. gemstones like lapis lazuli, chalcedony and agate don’t surface cracks to accept dye. They are naturally...chalcedony species include: AGATE: Dealers tend to apply the term agate to any patterned chalcedony that...Opaque to the naked eye. In a more Strict usage, agate is a chalcedony with curved or angular bands (layers)...processing center for agate is Idar-Oberstein in Germany, where a lot of agate used to be mined. Now...there from Brazil and Madagascar. Other sources of agate are Uruguay, Mexico, the U.S., Russia and India |
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Shipley, Robert M. (1945) Dictionary of Gems and Gemology (2nd ed.) Gemological Institute of America, Los Angeles. |
Book (edition) |
| adamantine spar. Achat (German). Agate, achates. Ancient name for agate, ac.hirite. Same as dioptase. ...stone. agate. agaphite. A vitl'eOUS variety of Per¬ sian turquoise. agata musgo (Port, Moss agate. and...agatize. To change into, or cause to resemble an agate. agatized wood. A variety of silicified wood which...which resembles any Span.). variety of agate. (ag' at). One of the many varieties of chalcedony. Multi¬...with inclu¬ sions of other minerals (as in moss agate). Bands are usually irregular and sometimes con¬ |
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Crowe, Judith (2006) The Jeweler's Directory of Gemstones. Firefly Books, Buffalo, NY. |
Book |
| turquoise, malachite, rnodochrosite, amethyst and agate. Opal forms from a silica gel, replacing bones and...forming growth features such as color banding in agate or uneven color zoning, for example in sapphire...of gemstone types, : from ruby and emerald to agate and quartz, can be found in cabochon form, including...ball pendant was made in 1930 using natural green agate cabochons. Double a YY yO slab Buff top Buff...Crystalline drusy surfaces from the linings of agate geodes, grapelike botryoidal crusts and pyrite layers |
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