Kamaishilite Mineral Data

General Kamaishilite Information

Chemical Formula:

Ca2Al2SiO6(OH)2

Composition:

Molecular Weight = 292.22 gm

Calcium 27.43 % Ca 38.38 % CaO

Aluminum 18.47 % Al 34.89 % Al₂O₃

Silicon 9.61 % Si 20.56 % SiO₂

Hydrogen 0.69 % H 6.17 % H₂O

Oxygen 43.80 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Al₂SiO₆(OH)₂

Environment:

Vesuvianite skarn. Dimorphous with bicchulite.

IMA Status:

Approved IMA 1981

Locality:

Kamaishi mine, Kamaishi, Iwate Prefecture, Honshu, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Kamaishilite + Pronunciation

Kamaishilite Image

Images:

Kamaishilite

Comments: Colorless crystalline massive kamaishilite.
Location: Kamaishi mine, Iwate Prefecture, Tohoku Region, Honshu Island, Japan. Scale: See Image.
© Rruff Database

Kamaishilite Crystallography

Axial Ratios:

a:c = 1:0.99096

Cell Dimensions:

a = 8.85, c = 8.77, Z = 4; V = 686.89 Den(Calc)= 2.83

Crystal System:

Tetragonal Space Group: I-lattice

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

By Intensity(I/I_o): 3.607(1), 2.799(0.85), 2.777(0.4),

Physical Properties of Kamaishilite

Cleavage:

None

Color:

Colorless.

Density:

2.83

Diaphaneity:

Transparent

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Kamaishilite

Gladstone-Dale:

CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2223,KPDmeas= 0.2223,KC= 0.2166
Ncalc = 1.61

Optical Data:

Uniaxial (-), e=1.629, w=1.629, bire=0.0000.

Calculated Properties of Kamaishilite

Electron Density:

Bulk Density (Electron Density)=2.83 gm/cc
note: Specific Gravity of Kamaishilite =2.83 gm/cc.

Fermion Index:

Fermion Index = 0.0050700347
Boson Index = 0.9949299653

Photoelectric:

PE_Kamaishilite= 4.28 barns/electron
U=PE_Kamaishilite x rElectron Density= 12.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kamaishilite is Not Radioactive

Kamaishilite Classification

Dana Class:

76.02.03.06 (76)Tectosilicate Al-Si Framework

(76.02)Feldspathoids and related species

(76.02.03)Sodalite group

76.02.03.01 Sodalite Na8Al6Si6O24Cl2 P 43n 4 3m

76.02.03.02 Nosean Na8Al6Si6O24(SO4) P 43m 4 3m

76.02.03.03 Hauyne (Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2 P 43n 4 3m

76.02.03.04 Lazurite Na3Ca(Al3Si3O12)S P 43n 4 3m

76.02.03.05 Bicchulite Ca2Al2SiO6(OH)2 I 43m 4 3m

76.02.03.06 Kamaishilite Ca2Al2SiO6(OH)2 I-lattice Tetra

76.02.03.07 Tugtupite Na4AlBeSi4O12Cl I 4 4

76.02.03.08 Tsaregorodtsevite N(CH3)4AlSi5O12 I 222 2 2 2

Strunz Class:

09.FB.10 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FB -Tektosilicates with additional anions

09.FB.10 Bicchulite Ca2Al2SiO6(OH)2 I 43m 4 3m

09.FB.10 Danalite Fe4Be3(SiO4)3S P 43n 4 3m

09.FB.10 Hauyne (Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2 P 43n 4 3m

09.FB.10 Genthelvite Zn4Be3(SiO4)3S P 43n 4 3m

09.FB.10 Helvite Mn4Be3(SiO4)3S P 43n 4 3m

09.FB.10 Lazurite Na3Ca(Al3Si3O12)S P 43n 4 3m

09.FB.10 Kamaishilite Ca2Al2SiO6(OH)2 I-lattice Tetra

09.FB.10 Nosean Na8Al6Si6O24(SO4) P 43m 4 3m

09.FB.10 Sodalite Na8Al6Si6O24Cl2 P 43n 4 3m

09.FB.10 Tugtupite Na4AlBeSi4O12Cl I 4 4

09.FB.10 Tsaregorodtsevite N(CH3)4AlSi5O12 I 222 2 2 2

Other Kamaishilite Information

References:

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

See Also:

Links to other databases for Kamaishilite :
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

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Kamaishilite

Ca2Al2SiO6(OH)2
Dana No: 76.02.03.06 Strunz No: 09.FB.10
Locality:

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