Kamaishilite Mineral Data

Kamaishilite Mineral Data +

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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.

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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:

TetragonalSpace 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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Kamaishilite

Electron Density:

r_electron=2.83 gm/cc
note: r_Kamaishilite=2.83 gm/cc.

Fermion Index

Fermion Index = 0.00507
Boson Index = 0.99493

Photoelectric:

PE_Kamaishilite= 4.28 barns/electron
U=PE_Kamaishilite x r_electron= 12.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kamaishilite is Not Radioactive

Kamaishilite Classification

Dana Class:

76.2.3.6 (76)Tectosilicate Al-Si Framework

(76.2)Feldspathoids and related species

(76.2.3)Sodalite group

76.2.3.1 Sodalite Na8Al6Si6O24Cl2 P 43n 4 3m

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

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

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

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

76.2.3.6 Kamaishilite Ca2Al2SiO6(OH)2 I-lattice Tetra

76.2.3.7 Tugtupite Na4AlBeSi4O12Cl I 4 4

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

Strunz Class:

VIII/J.11-60 VIII - Silicates

VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders

VIII/J.11 - Sodalite group, Tsaregorodtsevite - Wadalite series

VIII/J.11-05 Tsaregorodtsevite N(CH3)4AlSi5O12 I 222 2 2 2

VIII/J.11-10 Sodalite Na8Al6Si6O24Cl2 P 43n 4 3m

VIII/J.11-20 Nosean Na8Al6Si6O24(SO4) P 43m 4 3m

VIII/J.11-30 Hauyne (Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2 P 43n 4 3m

VIII/J.11-40 Lazurite Na3Ca(Al3Si3O12)S P 43n 4 3m

VIII/J.11-50 Tugtupite Na4AlBeSi4O12Cl I 4 4

VIII/J.11-60 Kamaishilite Ca2Al2SiO6(OH)2 I-lattice Tetra

VIII/J.11-70 Bicchulite Ca2Al2SiO6(OH)2 I 43m 4 3m

VIII/J.11-80 Wadalite Ca6Al5Si2O16Cl3 I 43d 4 3m

Other Kamaishilite Information

References:

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

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Kamaishilite

Ca2Al2SiO6(OH)2
Dana No: 76.2.3.6 Strunz No: VIII/J.11-60
Locality:

Notes: