| spinels from Paigutan in Nepal, Kiswila and Ipanko in Tanzania, Pamreso in Kenya, Mogok in Myanmar, and...in Tajikistan, Myanmar, Vietnam (Fig. 1A), and Tanzania (Yavorskyy & Hughes 2010). Occurrences are known...forsterite, clinohumite, apatite, margarite, pargasite, chlorite (sheridanite-clinochlore; Garnier et...dolomite (Dol), forsterite (Fo), clinohumite (Chu), pargasite, phlogopite (Phl), and chlorite (Fig. 1B). Hauzenberger...with calcite, dolomite, diopside, chondrodite, pargasite, clinohumite, forsterite, phlogopite, apatite |
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(2019, Summer) InColor 43. International Colored Gemstones Association |
Journal (issue) |
| Spinels from Sri Lanka 54 The Spinels of Mahenge, Tanzania In Search of Cobalt Blue Spinel in Vietnam...InColor Summer 2019 A 7.13-ct spinel from Mahenge, Tanzania. Cover image: Prangpak Ruahong, Nomads. 40...million and China's Hong Kong Special Administrative Region (SAR) with US$30.8 million, said the ministry's...ancient Kingdom of Balascia, related to Badakhshan, a region spanning parts of present-day Afghanistan and Tajikistan...are found in Tajikistan, Myanmar, Vietnam and Tanzania (Yavorskyy and Hughes, 2010; Giuliani et al., |
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Wu, Jinlin, Sun, Xueying, Ma, Hong, Ning, Peiying, Tang, Na, Ding, Ting, Li, Huihuang, Zhang, Tianyang, Ma, Ying (2023) Purple-Violet Gem Spinel from Tanzania and Myanmar: Inclusion, Spectroscopy, Chemistry, and Color. Minerals, 13 (2) 226 doi:10.3390/min13020226 |
Journal (article/letter/editorial) |
| minerals Article Purple-Violet Gem Spinel from Tanzania and Myanmar: Inclusion, Spectroscopy, Chemistry...com.cn Abstract: Purple-violet gem spinels from Tanzania and Myanmar have been investigated for their gemological...hue angle and lightless of purple spinels from Tanzania. However, due to the relatively stable content...study are of a limited number of samples from Tanzania and Myanmar. Citation: Wu, J.; Sun, X.; Ma, H...Keywords: purple-violet spinel; inclusion; chemistry; Tanzania; Myanmar Ning, P.; Tang, N.; Ding, T.; Li, H |
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Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 |
Journal (article/letter/editorial) |
| Vatomandry; (2) Andriba; (Antsirabe-Antanifotsy region, Soamiakatra-Ambohimandroso; Ambohibary); (3) Zazafotsy;...Zazafotsy; Ankaratra (Antsirabe-Antanifotsy region, Soamiakatra-Ambohimandroso; Ambohibary); (3)IlakakaZazafotsy;...John Saul mine; Penny Lane; Aqua, Hard Rock). Tanzania: (10) Umba (9) Mangare (Rockland-formerly John...John Saul mine; Penny Lane; Aqua, Hard Rock). Tanzania: (10) Umba valley; (11) Longido, Lossogonoi; (12)...(12) Winza; Loolera (Kibuko); (13) Morogoro (Mwalazi; Visakazi; valley; (11) Longido, Lossogonoi; (12) Winza; |
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(2011) Facette 18. Swiss Gemmological Institute SSEF |
Journal (issue) |
| Council. Vibrant red spinel of 38 ct from Mahenge, Tanzania. Spinel of 110 ct from Tajikistan certified...is derived from the name Badakhshan, a historic region comprising parts of what is now northeastern Afghanistan...spinels from Tanzania are found near Mahenge in the Morogoro Province in central Tanzania. These vibrant...Further spinels are found at Matombo (central Tanzania) and further in the south in Tunduru. Origin determination...possibility to visit the Ipanko spinel deposit near Mahenge in central Tanzania. The Ipanko mining zone itself |
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Sutherland, Frederick Lin, Zaw, Khin (2020) Mineralogy and Geochemistry of Ruby. MDPI. doi:10.3390/books978-3-03943-616-3 |
Book |
| the Australasian region. He works closely with his counterparts from the SE Asia region. He leads industry-CODES-funded...deposits from Montepeluez, Mozambique; Winza, Tanzania; Andilamena/Zahmena and Ampanihy/Toliara, Madagascar...Luc Yen, Vietnam; Jegdalek, Afghanistan; Morogoro, Tanzania. Metamorphic blue sapphire deposits included...triangular figure, it separated fields from Winza, Tanzania, Namehaca, Mozambique and Ampanihy and Zahmena...and Fe vs. V could roughly divide Myanmar and Morogoro area rubies, while ternary diagrams for Fe/Mg |
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(2015, Spring) Gems & Gemology Vol. 51 (1) Gemological Institute of America |
Journal (issue) |
| sequence. B lue spinels are mined in Sri Lanka, Tanzania, Myanmar, Pakistan, and Vietnam (Shigley and Stockton...is often associated with calcite, forsterite, pargasite (sodi-calcic amphibole), sulfides, and chlorites... The major additional phases are olivine and pargasite (figure 6). Several accessory phases were identified...always associated with olivine (forsterite) and pargasite in calcite matrix. Clinochlore surrounds all main...clinochlore, Gph = graphite, Ol = olivine, Pg = pargasite, Pyr = pyrrhotite, Sp = spinel. Photomicrographs |
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(2015, October 15th) The Rainbow of Africa Gem & Mineral Collection. Heritage Nature & Science Auction 5236. Heritage Auctions |
Catalog/List |
| the Tsumeb Mine (as well as other mines of the region) were still in production in the 1970s. You will...Azurite Level 8, Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia If the attachment point on the back of...Spitzkopje, Spitzkopje Area, Karibib District, Erongo Region, Namibia Klein Spitzkopje in Afrikaans means: the...Pseudomorph after Azurite Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Some of the best things to come from the...Epimorph on Cerussite Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia The multiple stages of mineralizing fluids |
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(2020) The Journal of Gemmology Vol. 37 (4) Gem-A |
Journal (issue) |
| west of Sakoany village in the Mahajanga (Majunga) region on the north-western coast of Madagascar, near...(605 nm) was somewhat shifted towards the blue region and it lacked Figure 1: This 4.22 ct celestine...inclusions in the ruby permitted the features in this region to be fully resolved. Corundum is anhydrous and...Because vesuvianite absorbs strongly in the mid-IR region of the spectrum, even minute inclusions can give...vesuvianite showed total absorption corresponded to the region of the compound band structure in the 2.19 ct ruby |
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Belley, Philippe M., Groat, Lee A. (2019) Metacarbonate-hosted Spinel On Baffin Island, Nunavut, Canada: Insights Into the Origin of Gem Spinel and Cobalt-Blue Spinel. The Canadian Mineralogist, 57 (2) 147-200 doi:10.3749/canmin.1800060 |
Journal (article/letter/editorial) |
| assemblage include calcite, dolomite, phlogopite, pargasite, diopside, humite, forsterite, scapolite, anorthite...(2) marble-hosted and eluvial deposits near Ipanko, Tanzania (Pardieu 2008); (3) marble-hosted and contiguous...MINERALOGIST TABLE 1. SPINEL OCCURRENCES UNDER STUDY Region Locality Markham Bay ‘‘Spinel’’ island Unnamed...medium-grained carbonate with subordinate forsterite and pargasite, and trace graphite and apatite. A 1–3 cm layer...forsterite, pargasite, and trace diopside. Forsterite grain boundaries are embayed by pargasite and diopside |
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(2019, Winter) Gems & Gemology Vol. 55 (4) Gemological Institute of America |
Journal (issue) |
| exceptional 4.10 ct concavefacet ruby from Winza, Tanzania, courtesy of Mark Gronlund. Photo by Robert Weldon/GIA...Kenya (612 ± 6 Ma; Simonet, 2000), Longido in Tanzania (610 ± 6 Ma; Le Goff et al., 2010), and the Vohibory...Ndoto (SN), Longido and Lonsogonoi (LL), Mahenge and Morogoro (MM), Kalalani and Umba (K), Songea (S)...and Sahambano (ZS), deposits from the Vohibory region (Vo), Ambatomena (Am), Andranondambo (An), Andilamena...sapphires from the Ambondromifehy placers, Antsiranana region, Madagascar; photo by G. Giuliani. B: Sapphire |
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(2022) The Journal of Gemmology Vol. 38 (2) Gem-A |
Journal (issue) |
| Zircon Inclusions in Emeralds from Lake Manyara, Tanzania | Large Euclase, Reportedly from Zimbabwe |
Chromiumbearing...Emeralds from Lake Manyara, Tanzania Emeralds were discovered at Lake Manyara, Tanzania, around the end of the...partially polished emerald from Lake Manyara, Tanzania, are doubly terminated and prismatic in shape...occurrence from Kruta Balka, western Peri-Azovian region, Ukraine: Implications for understanding the crystal...Manyara alexandrite-emerald deposit in northern Tanzania. Journal of Gemmology, 32(5), 179–209, https://doi |
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