Rustumite Mineral Data

General Rustumite Information

Chemical Formula:

Ca10(Si2O7)2(SiO4)Cl2(OH)2

Composition:

Molecular Weight = 934.12 gm

Calcium 42.90 % Ca 60.03 % CaO

Silicon 15.03 % Si 32.16 % SiO₂

Hydrogen 0.22 % H 1.93 % H₂O

Chlorine 7.59 % Cl 7.59 % Cl

- % Cl -1.71 % -O=Cl₂

Oxygen 34.26 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₁₀(Si₂O₇)₂(SiO₄)Cl₂(OH)₂

Environment:

In limestones between two ring dikes, formed during a metamorphic period in which H2O:CO2 in the vapor phase was relatively high.

IMA Status:

Approved IMA 1965

Locality:

In Scotland, from near Kilchoan, Ardnamurchan, Argyllshire. Link to MinDat.org Location Data.

Name Origin:

Named for Rustum Roy (1924- ), experimental petrologist and materials scientist, Pennsylvania State University, University Park, Pennsylvania, USA.

Name Pronunciation:

Rustumite + Pronunciation

Synonym:

ICSD 20160

PDF 18-305

Rustumite Image

Images:

Rustumite Dellaite

Comments: White grains of dellaite, intermixed with rustumite.
Location: Queretaro, Zacatecas, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rustumite Crystallography

Axial Ratios:

a:b:c =0.4107:1:0.8361

Cell Dimensions:

a = 7.62, b = 18.55, c = 15.51, Z = 4; beta = 104.33° V = 2,124.14 Den(Calc)= 2.92

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 2.881(1), 3.028(1), 3.189(0.58),

Crystal Structure:

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Nevskii N N , Ilyukhin V V , Khaui R A , Belov N V , Soviet Physics Doklady , 24 (1979) p.812-814, The crystal structure of rustumite

Physical Properties of Rustumite

Cleavage:

{100} Indistinct

Color:

Colorless.

Density:

2.835

Diaphaneity:

Transparent

Streak:

white

Optical Properties of Rustumite

Optical Data:

NCalc= 1.65 - from Gladstone-Dale relationship (KC = 0.2235) where Ncalc=Dcalc*KC+1
NCalc= 1.63 - from Gladstone-Dale relationship (KC = 0.2235) where Ncalc=Dmeas*KC+1

Calculated Properties of Rustumite

Electron Density:

Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Rustumite =2.92 gm/cc.

Fermion Index:

Fermion Index = 0.0077644616
Boson Index = 0.9922355384

Photoelectric:

PE_Rustumite= 6.33 barns/electron
U=PE_Rustumite x rElectron Density= 18.43 barns/cc.

Radioactivity:

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

Rustumite Classification

Dana Class:

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

(58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)

(58.02.05)Dana Group

58.02.05.01 Rustumite Ca10(Si2O7)2(SiO4)Cl2(OH)2 C 2/c 2/m

Strunz Class:

09.BG.30 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;

09.BG.30 Rustumite Ca10(Si2O7)2(SiO4)Cl2(OH)2 C 2/c 2/m

Other Rustumite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Rustumite :
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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Ask about Rustumite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Rustumite

Ca10(Si2O7)2(SiO4)Cl2(OH)2
Dana No: 58.02.05.01 Strunz No: 09.BG.30
Locality:

Notes: