Tilleyite Mineral Data

Tilleyite Mineral Data +

General Tilleyite Information

Chemical Formula:

Ca5Si2O7(CO3)2

Composition:

Molecular Weight = 488.58 gm

Calcium 41.02 % Ca 57.39 % CaO

Silicon 11.50 % Si 24.60 % SiO₂

Carbon 4.92 % C 18.02 % CO₂

Oxygen 42.57 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅Si₂O₇(CO₃)₂

Environment:

Metamorphosed limestone

IMA Status:

Valid Species (Pre-IMA) 1933

Locality:

Crestmore quarry, 5 miles NW of Riverside, Riverside County, California. Link to MinDat.org Location Data.

Synonym:

ICSD 14256

PDF 24-184

Tilleyite Image

Images:

Tilleyite

Comments: Opaque white fibrous tilleyite with blue calcite.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tilleyite Crystallography

Axial Ratios:

a:b:c =1.4631:1:0.7428

Cell Dimensions:

a = 15.025, b = 10.269, c = 7.628, Z = 4; beta = 105.833° V = 1,132.29 Den(Calc)= 2.87

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 3.005(1), 3.095(0.85), 2.895(0.65),

Crystal Structure:

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Grice J D , The Canadian Mineralogist , 43 (2005) p.1489-1500, The structure of spurrite, tilleyite and scawtite,, and relationships to other silicate-carbonate minerals, Locality: Cornet Hill, Apuseni Mountains, Romania

View Additional jPOWD Structure files for Tilleyite
[1]

Physical Properties of Tilleyite

Cleavage:

[100] Perfect, [101] Good

Color:

Colorless, White.

Density:

2.84

Diaphaniety:

Transparent to Translucent

Streak:

white

Optical Properties of Tilleyite

Gladstone-Dale:

CI meas= -0.064 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2208,KPDmeas= 0.2231,KC= 0.2097

Optical Data:

Biaxial (+), a=1.612-1.617, b=1.632-1.635, g=1.652-1.654, bire=0.0370-0.0400, 2V(Calc)=88-90, 2V(Meas)=85-90. Dispersion r < v.

Calculated Properties of Tilleyite

Electron Density:

r_electron=2.87 gm/cc
note: r_Tilleyite=2.87 gm/cc.

Fermion Index

Fermion Index = 0.00666
Boson Index = 0.99334

Photoelectric:

PE_Tilleyite= 5.53 barns/electron
U=PE_Tilleyite x r_electron= 15.84 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tilleyite is Not Radioactive

Tilleyite Classification

Dana Class:

56.2.9.1 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.9)Tilleyite - Killalaite group

56.2.9.1 Tilleyite Ca5Si2O7(CO3)2 P 2₁/a 2/m

56.2.9.2 Killalaite 2Ca3Si2O7·(H2O) P 2₁/m 2/m

56.2.9.3 Foshallasite Ca3Si2O7·3(H2O) Mono

Strunz Class:

VIII/C.09-20 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.09 - Tilleyite - Foshallasite series

VIII/C.09-20 Tilleyite Ca5Si2O7(CO3)2 P 2₁/a 2/m

VIII/C.09-30 Jaffeite Ca4(Si3O7)(OH)6 P 3 3

VIII/C.09-40 Suolunite Ca2Si2O5(OH)2·(H2O) F dd2 mm2

VIII/C.09-50 Killalaite 2Ca3Si2O7·(H2O) P 2₁/m 2/m

VIII/C.09-60 Foshallasite Ca3Si2O7·3(H2O) Mono

Other Tilleyite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Tilleyite

Ca5Si2O7(CO3)2
Dana No: 56.2.9.1 Strunz No: VIII/C.09-20
Locality:

Notes: