Svyatoslavite Mineral Data

Svyatoslavite Mineral Data +

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General Svyatoslavite Information

Chemical Formula:

CaAl2Si2O8

Composition:

Molecular Weight = 278.21 gm

Calcium 14.41 % Ca 20.16 % CaO

Aluminum 19.40 % Al 36.65 % Al₂O₃

Silicon 20.19 % Si 43.19 % SiO₂

Oxygen 46.01 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaAl₂Si₂O₈

IMA Status:

Approved IMA 1989

Locality:

Link to MinDat.org Location Data.

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Svyatoslavite Crystallography

Axial Ratios:

a:b:c =0.9544:1:0.5599

Cell Dimensions:

a = 8.228, b = 8.621, c = 4.827, Z = 2; beta = 90° V = 342.40 Den(Calc)= 2.70

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 3.22(1), 2.09(0.8), 4.16(0.8),

Physical Properties of Svyatoslavite

Cleavage:

[100] Indistinct

Color:

Colorless.

Density:

2.695

Diaphaniety:

Transparent

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Svyatoslavite

Gladstone-Dale:

CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2112,KPDmeas= 0.2116,KC= 0.208

Optical Data:

Biaxial (-), a=1.552, b=1.578, g=1.581, bire=0.0290, 2V(Calc)=36, 2V(Meas)=37.08.

Calculated Properties of Svyatoslavite

Electron Density:

r_electron=2.68 gm/cc
note: r_{Svyatoslavite}=2.70 gm/cc.

Fermion Index

Fermion Index = 0.00984
Boson Index = 0.99016

Photoelectric:

PE_{Svyatoslavite}= 3.12 barns/electron
U=PE_{Svyatoslavite} x r_electron= 8.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Svyatoslavite is Not Radioactive

Svyatoslavite Classification

Dana Class:

76.1.6.4 (76)Tectosilicate Al-Si Framework

(76.1)with Al-Si frameworks

(76.1.6)Banalsite group

76.1.6.1 Banalsite BaNa2Al4Si4O16 I bam 2/m 2/m 2/m

76.1.6.2 Stronalsite SrNa2Al4Si4O16 I bam,Iba2 Ortho

76.1.6.3 Lisetite Na2CaAl4Si4O16 Pbc2 mm2

76.1.6.4 Svyatoslavite CaAl2Si2O8 P 2₁ 2

Strunz Class:

VIII/J.07-80 VIII - Silicates

VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders

VIII/J.07 - Feldspar group, Anorthoclase - Anorthite - Banalcite series

VIII/J.07-10 Anorthoclase (Na,K)AlSi3O8 C1 1

VIII/J.07-20 Albite NaAlSi3O8 C1 1

VIII/J.07-30 Oligoclase (Na,Ca)(Si,Al)4O8 C1 1

VIII/J.07-40 Andesine* (Na,Ca)(Si,Al)4O8 C1 1

VIII/J.07-50 Labradorite* (Ca,Na)(Si,Al)4O8 C1 1

VIII/J.07-60 Bytownite* (Ca,Na)(Si,Al)4O8 C1 1

VIII/J.07-70 Anorthite CaAl2Si2O8 P1,I1 1

VIII/J.07-75 Dmisteinbergite CaAl2Si2O8 P 6/mmm 6/m 2/m 2/m

VIII/J.07-80 Svyatoslavite CaAl2Si2O8 P 2₁ 2

VIII/J.07-90 Stronalsite SrNa2Al4Si4O16 I bam,Iba2 Ortho

VIII/J.07-100 Banalsite BaNa2Al4Si4O16 I bam 2/m 2/m 2/m

VIII/J.07-110 Filatovite! K[(Al,Zn)2(As,Si)2O8] I2/c 2/m

Other Svyatoslavite Information

References:

PHYS. PROP.(Am.Min.,Vol.76,p300,1996) OPTIC PROP.(Am.Min.,Vol.76,p300,1996)

See Also:

Links to other databases for Svyatoslavite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 - Mineral and Gemstone Kingdom 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Svyatoslavite

CaAl2Si2O8
Dana No: 76.1.6.4 Strunz No: VIII/J.07-80
Locality:

Notes: