Armenite Mineral Data

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 % 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

Empirical Formula:

BaCa₂Al₆Si₉O₃₀·2(H₂O)

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.

Synonym:

Calciocelsian

ICSD 24977

PDF 37-432

Armenite Image

Images:

Armenite

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

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 - PyramidalH-M Symbol (mm2) Space Group: Pnc2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.4(1), 3.86(0.98), 2.91(0.74),

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

Cleavage:

[010] Perfect, [110] Distinct

Color:

Colorless, Gray green, White.

Density:

2.76

Diaphaniety:

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

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:

r_electron=2.68 gm/cc
note: r_Armenite=2.75 gm/cc.

Fermion Index

Fermion Index = 0.0319
Boson Index = 0.9681

Photoelectric:

PE_Armenite= 51.31 barns/electron
U=PE_Armenite x r_electron= 137.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Armenite is Not Radioactive

Armenite Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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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: