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)

Environment:

In miarolitic cavities in granite.

IMA Status:

Approved IMA 1982

Locality:

From the Diverio quarry, Mt. Mottarone, near Baveno, Piedmont, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for CAlcium and SCANDium in the composition.

Synonym:

ICSD 17047

PDF 35-541

Cascandite Image

Images:

Cascandite Jervisite

Comments: White, acicular jervisite crystals and pink cascandite crystals.
Location: Seula min,, Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy. Scale: Crystal Size 1 mm.
© Sergio Varvello / Mineral Service

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

Diaphaneity:

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= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2223,KPDmeas= 0.2238,KC= 0.2177
Ncalc = 1.66

Optical Data:

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

Calculated Properties of Cascandite

Electron Density:

Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Cascandite =3.03 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Cascandite= 5.36 barns/electron
U=PE_Cascandite x rElectron Density= 16.10 barns/cc.

Radioactivity:

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

Cascandite Classification

Dana Class:

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

(65.02)with chains P=3

(65.02.01)Wollastonite group

65.02.01.01a Wollastonite-1A CaSiO3 P1 1

65.02.01.01b Wollastonite-2M* CaSiO3 P 2₁ 2

65.02.01.01c Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

65.02.01.02 Bustamite (Mn,Ca)3Si3O9 P1 1

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

65.02.01.04 Pectolite NaCa2Si3O8(OH) P1 1

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

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

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

65.02.01.08 Tanohataite! LiMn2Si3O8(OH) P1 1

Strunz Class:

09.DG.07 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DG -Inosilicates with 3-periodic single and multiple chains

09.DG.07 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

Other Cascandite Information

References:

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

See Also:

Links to other databases for Cascandite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Cascandite

Ca(Sc,Fe++)Si3O8(OH)
Dana No: 65.02.01.06 Strunz No: 09.DG.07
Locality:

Notes: