Amicite (original) (raw)

A valid IMA mineral species

About AmiciteHide

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Formula:

K2Na2Al4Si4O16 · 5H2O

Specific Gravity:

2.06 - 2.23

Crystal System:

Monoclinic

Name:

Named in 1979 for Giovanni Battista Amici (1786-1863), physicist, optician and inventor of the Amici lens.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:199:9

ef2646f8-7973-4f4d-9068-533a22ab5fc5

IMA Classification of AmiciteHide

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IMA Formula:

K2Na2(Al4Si4O16) · 5H2O

Type description reference:

Classification of AmiciteHide

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9.GC.05

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
C : Chains of doubly-connected 4-membered rings

77.1.3.2

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of AmiciteHide

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Density:

2.06 - 2.23 g/cm3 (Measured) 2.16(2) g/cm3 (Calculated)

Optical Data of AmiciteHide

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RI values:

_n_α = 1.485 _n_β = 1.490 _n_γ = 1.494

δ = 0.009

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of AmiciteHide

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Mindat Formula:

K2Na2Al4Si4O16 · 5H2O

Common Impurities:

Fe,Mg,Ca,Sr,Ba

Crystallography of AmiciteHide

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Crystal System:

Monoclinic

Class (H-M):

2 - Sphenoidal

Cell Parameters:

a = 10.22 Å, b = 10.42 Å, c = 9.88 Å
β = 88.32°

Ratio:

a:b:c = 0.981 : 1 : 0.948

Unit Cell V:

1,051.69 ų (Calculated from Unit Cell)

Morphology:

As well-formed pseudotetragonal pyramidal crystals, to 5 mm, showing {011} and {110}, or more rarely {111} and {110}.

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0009695	Amicite	Alberti A, Vezzalini G (1979) The crystal structure of amicite, a zeolite Acta Crystallographica B35 2866-2869		1979	basaltic rock at Howenegg in Hegau, southern West Germany	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Geological Setting:

in natrolite veinlets cutting ijolite-urtite pegmatites and apatite-nepheline rocks (Kola Peninsula, Russia).

Type Occurrence of AmiciteHide

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General Appearance of Type Material:

well-formed pseudotetragonal pyramidal crystals, to 5 mm

Place of Conservation of Type Material:

University of Modena, Modena, Italy; The Natural History Museum, London, England; National Museum of Natural History, Washington, D.C., USA, 145843.

Geological Setting of Type Material:

In veinlets cutting melilite-nephelinite volcanic rocks and pyroclastics

Associated Minerals at Type Locality:

Reference:

Alberti, A., Hentschel, G., Vezzalini, G. (1979) Amicite, a new natural zeolite. Neues Jahrbuch für Mineralogie, Monatshefte: 1979: 481-488.

Synonyms of AmiciteHide

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Other Language Names for AmiciteHide

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Relationship of Amicite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for AmiciteHide

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References for AmiciteHide

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Localities for AmiciteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Germany (TL)
Baden-Württemberg Freiburg Region Tuttlingen Immendingen ⓘ Höwenegg Quarry (Hewenegg Quarry) (TL)	Alberti et al. (1979) +1 other reference
Iceland
Southern Region Vestmannaeyjar Vestmannaeyjar archipelago (Westman islands) Surtsey Island ⓘ Unnamed borehole	Jackson et al. (2019)
Israel
Southern District (HaDarom District) Tamar Regional Council ⓘ Hatrurim Basin	Skrzyńska et al. (2023)
Russia
Murmansk Oblast Khibiny Massif Koashva Mt ⓘ Koashva Open Pit	Pekov et al. (2008)
Kukisvumchorr Mt ⓘ Kirovskii apatite mine	[World of Stones 95:5-6 +1 other reference
Spain
Castile-La Mancha Ciudad Real Ciudad Real ⓘ El Arzollar volcano	Calvo et al. (2013)
USA
Oregon Clatsop County Highway 26 ⓘ Mc Gregor Quarry ?	Zach Capel