Kilchoanite Mineral Data

General Kilchoanite Information

Chemical Formula:

Ca3Si2O7

Composition:

Molecular Weight = 288.40 gm

Calcium 41.69 % Ca 58.33 % CaO

Silicon 19.48 % Si 41.67 % SiO₂

Oxygen 38.83 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃(Si₂O₇)

Environment:

Retrograde replacement of rankinite.

IMA Status:

Approved IMA 1961

Locality:

Kilchoan, Ardnamurchan, Scotland. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Kilchoanite + Pronunciation

Synonym:

ICSD 63499

PDF 29-370

Kilchoanite Crystallography

Axial Ratios:

a:b:c =2.2436:1:4.3123

Cell Dimensions:

a = 11.42, b = 5.09, c = 21.95, Z = 8; V = 1,275.91 Den(Calc)= 3.00

Crystal System:

Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: I2cm

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

By Intensity(I/I_o): 2.89(1), 2.68(0.95), 3.07(0.9),

Physical Properties of Kilchoanite

Cleavage:

None

Color:

Colorless.

Density:

2.99

Diaphaneity:

Transparent

Streak:

white

Optical Properties of Kilchoanite

Gladstone-Dale:

CI meas= -0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2162,KPDmeas= 0.2169,KC= 0.2092
Ncalc = 1.63

Optical Data:

Biaxial (+), a=1.647, b=1.649, g=1.65, bire=0.0030, 2V(Calc)=70, 2V(Meas)=60. Dispersion r > v.

Pleochroism (x):

anomalous.

Pleochroism (y):

anomalous.

Pleochroism (z):

anomalous.

Calculated Properties of Kilchoanite

Electron Density:

Bulk Density (Electron Density)=3.00 gm/cc
note: Specific Gravity of Kilchoanite =3.00 gm/cc.

Fermion Index:

Fermion Index = 0.0098448395
Boson Index = 0.9901551605

Photoelectric:

PE_Kilchoanite= 5.85 barns/electron
U=PE_Kilchoanite x rElectron Density= 17.53 barns/cc.

Radioactivity:

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

Kilchoanite Classification

Dana Class:

58.03.02.01 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.03)with insular single and triple groups (n=1,3)

(58.03.02)Dana Group

58.03.02.01 Kilchoanite Ca3Si2O7 I2cm mm2

Strunz Class:

09.BJ.45 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BJ -Sorosilicates with Si3O10, Si4O11, etc

09.BJ.45 Kilchoanite Ca3Si2O7 I2cm mm2

Other Kilchoanite Information

References:

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

See Also:

Links to other databases for Kilchoanite :
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
15 - WWW-MINCRYST

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

Kilchoanite

Ca3Si2O7
Dana No: 58.03.02.01 Strunz No: 09.BJ.45
Locality:

Notes:

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