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|Name:||Named after the type locality, the Armen Mine, Kongsberg, Norway.|
The type specimen was collected already in 1877 by cand. min. O.A. Corneliussen. He labelled the sample as "Epidote?". It was kept in the collection of the University of Oslo until February 1939 when it was rediscovered by Henrich Neumann, who also recognized it as a new mineral.
This page provides mineralogical data about Armenite.
Classification of Armenite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/E.22-150|
|Nickel-Strunz 10th (pending) edition ID:||9.CM.05|
9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
|Dana 8th edition ID:||63.2.1b.1|
63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
|Hey's CIM Ref.:||16.12.12|
16 : Silicates Containing Aluminum and other Metals
12 : Aluminosilicates of Sr, Ba and Zn
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Type Occurrence of Armenite
|Type Locality:||Armen Mine, Overberget Mining Field, Kongsberg Silver Mining District, Kongsberg, Buskerud, Norway|
|Year of Discovery:||1939|
Physical Properties of Armenite
Crystallography of Armenite
|Cell Parameters:||a = 13.87Å, b = 18.66Å, c = 10.69Å|
|Ratio:||a:b:c = 0.743 : 1 : 0.573|
|Unit Cell Volume:||V 2,766.72 Å³ (Calculated from Unit Cell)|
Optical Data of Armenite
|RI values:||nα = 1.550 nβ = 1.552 nγ = 1.556|
|2V:||Measured: 59° to 60°, Calculated: 72°|
|Maximum Birefringence:||δ = 0.006|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r < v strong|
Chemical Properties of Armenite
|Essential elements:||Al, Ba, Ca, H, O, Si|
|All elements listed in formula:||Al, Ba, Ca, H, O, Si|
Relationship of Armenite to other Species
|Member of:||Osumilite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Armenite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Armenite
- Neumann, H. (1939): Armenite, a new mineral. Preliminary note. Norsk Geologisk Tidskrift. 19, 21-22
- Neumann, H. (1941): Armenite, a water-bearing barium-calcium-alumo-silicate. Norsk Geologisk Tidskrift. 21, 19-24
American Mineralogist: 26: 235.
Gaston Pouliot, Pierre Trudel, Guy Valiquette, and Paul N. Samson (1984): Armenite-thulite-albite veins at Remigny, Quebec; the second occurrence of armenite. Can. Mineral. 22, 453-464.
Armbruster, T. & Czank, M. (1992): H2O ordering and superstructures in armenite, BaCa2Al6Si9O30.2H2O: A single-crystal X-ray and TEM study. American Mineralogist 77, 422-430, 1119.
Geiger, C.A., Gatta, G.D., Xue, X., McIntyre, G.J. (2012): A neutron/X-Ray diffraction, IR, and 1H/29Si NMR Spectroscopic investigation of armenite: behavior of extra framework Ca cations and H2O molecules in microporous silicates. Zeitschrift für Kristallographie, 227, 411-426.
Internet Links for Armenite
Localities for Armenite
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Channing Uranium trench, Dickinson Co., Michigan, USAFrom Paul Brandes, 12th Dec 2013 20:39:26