Cascandite Mineral Data

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 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 - 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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