Cascandite Mineral Data

Cascandite Mineral Data

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General Cascandite Information

Chemical Formula:

Ca(Sc,Fe++)Si3O8(OH)

Composition:

Molecular Weight = 317.02 gm

Calcium 12.64 % Ca 17.69 % CaO

Scandium 10.64 % Sc 16.31 % Sc₂O₃

Iron 4.40 % Fe 5.67 % FeO

Silicon 26.58 % Si 56.86 % SiO₂

Hydrogen 0.32 % H 2.84 % H₂O

Oxygen 45.42 % O

______ ______

100.00 % 99.37 % = TOTAL OXIDE

Empirical Formula:

CaSc_0.75Fe²⁺_0.25Si₃O₈(OH)

IMA Status:

Approved IMA 1982

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 17047

PDF 35-541

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Cascandite Crystallography

Axial Ratios:

a:b:c =0.9396:1:0.679

Cell Dimensions:

a = 9.791, b = 10.42, c = 7.076, Z = 4; alpha = 98.91°, beta = 102.63°, gamma = 84.17° V = 692.34 Den(Calc)= 3.04

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: C1

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

By Intensity(I/I_o): 2.821(1), 3.62(0.75), 3.1(0.65),

Crystal Structure:

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Mellini M , Merlino S , American Mineralogist , 67 (1982) p.604-609, The crystal structure of cascandite, CaScSi3O8(OH)

Physical Properties of Cascandite

Cleavage:

[100] Good, [001] Good

Color:

Light pink.

Density:

3.01

Diaphaniety:

Transparent

Hardness:

4.5-5.5 - Near Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Cascandite

Gladstone-Dale:

CI meas= -0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2215,KPDmeas= 0.2238,KC= 0.2177

Optical Data:

Biaxial (?), a=1.663, g=1.684, bire=0.0210

Calculated Properties of Cascandite

Electron Density:

r_electron=3.02 gm/cc
note: r_Cascandite=3.04 gm/cc.

Fermion Index

Fermion Index = 0.01373
Boson Index = 0.98627

Photoelectric:

PE_Cascandite= 5.36 barns/electron
U=PE_Cascandite x r_electron= 16.15 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cascandite is Not Radioactive

Cascandite Classification

Dana Class:

65.2.1.6 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.2)with chains P=3

(65.2.1)Wollastonite group

65.2.1.1a Wollastonite-1A CaSiO3 P1 1

65.2.1.1b Wollastonite-2M* CaSiO3 P 2₁ 2

65.2.1.1c Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

65.2.1.2 Bustamite (Mn,Ca)3Si3O9 P1 1

65.2.1.3 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

65.2.1.4 Pectolite NaCa2Si3O8(OH) P1 1

65.2.1.5 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

65.2.1.6 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

65.2.1.7 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

Strunz Class:

VIII/F.18-50 VIII - Silicates

VIII/F - Inosilicates (chain and band) Triplet chains [Si3O9]6-

VIII/F.18 - Wollastonite-2M - Foshagite series

VIII/F.18-10 Wollastonite-1A CaSiO3 P1 1

VIII/F.18-10* Wollastonite-2M* CaSiO3 P 2₁ 2

VIII/F.18-10** Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

VIII/F.18-30 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

VIII/F.18-40 Bustamite (Mn,Ca)3Si3O9 P1 1

VIII/F.18-50 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

VIII/F.18-60 Pectolite NaCa2Si3O8(OH) P1 1

VIII/F.18-70 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

VIII/F.18-80 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

VIII/F.18-90 Foshagite Ca4Si3O9(OH)2 P 2₁/m 2/m

VIII/F.18-100 Hillebrandite Ca6Si3O9(OH)6 C mc2₁ mm2

Other Cascandite Information

References:

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

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Cascandite

Ca(Sc,Fe++)Si3O8(OH)
Dana No: 65.2.1.6 Strunz No: VIII/F.18-50
Locality:

Notes: