Armenite Mineral Data + Say ARMENITE

General Armenite Information

Help on Chemical  Formula: Chemical Formula: BaCa2Al6Si9O30·2(H2O)
Help on Composition: 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 % Al2O3
   Silicon   22.02 %  Si   47.10 % SiO2
   Hydrogen   0.35 %  H     3.14 % H2O
   Oxygen    44.59 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: BaCa2Al6Si9O30·2(H2O)
Help on Environment: Environment: Silicate mineral found in Ba-rich hydrothermal veins or fissures.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1939
Help on Locality: Locality: Armen Mine, Kongsberg, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name origin for Armenite is the type locality.
Help on Synonym: Synonym: Calciocelsian
  ICSD 24977
  PDF 37-432
 

Armenite Image

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Armenite

Comments: Translucent, white armenite crystals.
Location: Simplon Pass, Brig, Valais, Switzerland. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Armenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7444:1:1.2969
Help on Cell Dimensions: Cell Dimensions: a = 18.66, b = 10.697, c = 13.874, Z = 4; V = 2,769.33 Den(Calc)= 2.75
Help on Crystal System: Crystal System: Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pnc2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.4(1), 3.86(0.98), 2.91(0.74),
Click Here for Large Armenite Structure Window Crystal Structure:

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Armbruster T , Czank M , American Mineralogist , 77 (1992) p.422-430, H2O ordering and superstructures in armenite, BaCa2Al6Si9O30.2H2O: A, single-crystal X-ray and TEM study, sample from Remigny, Quebec, Canada

View Additional jPOWD Structure files for Armenite
[1]
 

Physical Properties of Armenite

Help on Cleavage: Cleavage: [010] Perfect, [110] Distinct
Help on Color: Color: Colorless, Gray green, White.
Help on Density: Density: 2.76
Help on Diaphaniety: Diaphaniety: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 7.5 - Garnet
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Armenite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density:

relectron=2.68 gm/cc
note: rArmenite =2.75 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.0319
Boson Index = 0.9681
Help on Photoelectric: Photoelectric:

PEArmenite = 51.31 barns/electron
U=PEArmenite x relectron= 137.65 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Armenite is Not Radioactive

 

Armenite Classification

Help on  Dana Class: Dana Class: 63.2.1b.1 (63)Cyclosilicate Condensed Rings
  (63.2)Milarite - Osumilite type (6x2) Double Rings
  (63.2.1b)Milarite - Osumilite group
 
63.2.1b.1 Armenite BaCa2Al6Si9O30·2(H2O) Pnc2 mm2
Help on  Strunz Class: Strunz Class: VIII/E.22-150 VIII - Silicates
  VIII/E - Cyklosilicates, double six rings [Si12O30]12-
  VIII/E.22 - Millarite - Osumilite series
 
VIII/E.22-10 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-20 Milarite K2Ca4Al2Be4Si24O60·(H2O) P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-22 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-25 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-30 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-40 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 63/mmc 6/m 2/m 2/m
 
VIII/E.22-50 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-60 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-70 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m
 
VIII/E.22-80 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-90 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-100 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m
 
VIII/E.22-110 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-120 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m
 
VIII/E.22-125 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-130 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-133 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-135 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-140 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m
 
VIII/E.22-150 Armenite BaCa2Al6Si9O30·2(H2O) Pnc2 mm2
 

Other Armenite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Armenite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - WWW-MINCRYST 15 -École des Mines de Paris

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Print or Cut-and-Paste your Armenite Specimen Label here :

Armenite

BaCa2Al6Si9O30·2(H2O)
Dana No: 63.2.1b.1 Strunz No: VIII/E.22-150
Locality:

 

Notes:

 

 
   
 
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