Armenite Mineral Data
General Armenite Information
Chemical Formula:
BaCa2Al6Si9O30•2(H2O)
Composition:
Molecular Weight = 1,148.15 gm
Barium 11.96 % Ba 13.35 % BaO
Calcium 6.98 % Ca 9.77 % CaO
Aluminum 14.10 % Al 26.64 % Al2 O3
Silicon 22.02 % Si 47.10 % SiO2
Hydrogen 0.35 % H 3.14 % H2 O
Oxygen 44.59 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
BaCa2 Al6 Si9 O30 •2(H2 O)
Environment:
Silicate mineral found in Ba-rich hydrothermal veins or fissures.
IMA Status:
Valid Species (Pre-IMA) 1939
Locality:
Armen Mine, Kongsberg, Norway. Link to MinDat.org Location Data.
Name Origin:
The name origin for Armenite is the type locality.
Name Pronunciation:
Armenite
Synonym:
Calciocelsian
ICSD 24977
PDF 37-432
Armenite Image
Images:
Armenite Crystallography
Axial Ratios:
a:b:c =1.7444:1:1.2969
Cell Dimensions:
a = 18.66, b = 10.697, c = 13.874, Z = 4; V = 2,769.33 Den(Calc)= 2.75
Crystal System:
Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Pnc2
X Ray Diffraction:
By Intensity(I/Io ): 3.4(1), 3.86(0.98), 2.91(0.74),
Physical Properties of Armenite
Cleavage:
{010} Perfect, {110} Distinct
Color:
Colorless, Gray green, White.
Density:
2.76
Diaphaneity:
Translucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Hardness:
7.5 - Garnet
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Armenite
Gladstone-Dale:
CI meas = 0.006 (Superior) - where the CI = (1-KPDmeas /KC ) CI calc = 0.002 (Superior) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.201,KPDmeas = 0.2002,KC = 0.2014 Ncalc = 1.55 - 1.56
Optical Data:
Biaxial (-), a=1.55, b=1.552, g=1.556, bire=0.0060, 2V(Calc)=72, 2V(Meas)=59.9-60.
Calculated Properties of Armenite
Electron Density:
Bulk Density (Electron Density)=2.68 gm/cc note: Specific Gravity of Armenite =2.75 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEArmenite = 51.31 barns/electronU=PEArmenite x r Electron Density= 137.65 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Armenite is Not Radioactive
Armenite Classification
Dana Class:
63.02.01b.01 (63) Cyclosilicate Condensed Rings
(63.02) 6-membered rings
(63.02.01b) Milarite - Osumilite group
63.02.01b.01 Armenite BaCa2Al6Si9O30•2(H2O) Pnc2 mm2
Strunz Class:
09.CM.05 09 - SILICATES (Germanates)
09.C - Cyclosilicates
09.CM -[Si6O18]12- 6-membered double rings (sechser-Doppelringe)
09.CM.05 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m
09.CM.05 Armenite BaCa2Al6Si9O30•2(H2O) Pnc2 mm2
09.CM.05 Berezanskite ! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m
09.CM.05 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m
09.CM.05 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m
09.CM.05 Shibkovite ! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m
09.CM.05 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m
09.CM.05 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m
09.CM.05 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m
09.CM.05 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 63 /mmc 6/m 2/m 2/m
09.CM.05 Milarite K2Ca4Al2Be4Si24O60•(H2O) P 6/mcc 6/m 2/m 2/m
09.CM.05 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m
09.CM.05 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m
09.CM.05 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m
09.CM.05 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m
09.CM.05 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m
09.CM.05 Oftedalite ! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m
09.CM.05 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m
09.CM.05 Trattnerite ! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m
09.CM.05 Almarudite ! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m
Other Armenite Information
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Armenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Armenite Specimen Label here :
Armenite
BaCa2Al6Si9O30•2(H2O)
Dana No: 63.02.01b.01 Strunz No: 09.CM.05
Locality:
Notes:
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