Asbecasite Mineral Data + Say ASBECASITE


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General Asbecasite Information

Help on Chemical  Formula: Chemical Formula: Ca3(Ti,Sn)As+++6Si2Be2O20
Help on Composition: Composition: Molecular Weight = 1,057.85 gm
   Calcium    10.23 %  Ca   14.31 % CaO
   Titanium    3.17 %  Ti    5.29 % TiO2
   Beryllium   1.70 %  Be    4.73 % BeO
   Aluminum    0.77 %  Al    1.45 % Al2O3
   Silicon     5.31 %  Si   11.36 % SiO2
   Tin         1.12 %  Sn    1.42 % SnO2
   Arsenic    47.45 %  As   62.65 % As2O3
   Oxygen     30.25 %  O
             ______        ______ 
             100.00 %      101.21 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2.7Ti0.7Sn0.1As6.7Si2Al0.3Be2O20
Help on Environment: Environment: On cleft faces in orthogneiss.
Help on IMA Status: IMA Status: Approved IMA 1966
Help on Locality: Locality: East flank of Pizzo Cervandone, Alpe Devero, Val d'Aosta, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name origin for Asbecasite is the main elements: As,Be,Ca,Si.
Help on Synonym: Synonym: ICSD 74290
  PDF 19-87
 

Asbecasite Image

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Asbecasite

Comments: Brownish yellow asbecasite prismatic crystal.
Location: Cervandone, Val d'Ossola, Lombardy, Italy. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Asbecasite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.83014
Help on Cell Dimensions: Cell Dimensions: a = 8.36, c = 15.3, Z = 2; V = 926.05 Den(Calc)= 3.79
Help on Crystal System: Crystal System: Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.23(1), 1.153(0.7), 1.57(0.7),
Click Here for Large Asbecasite Structure Window Crystal Structure:

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Help on Above


Sacerdoti M , Parodi G C , Mottana A , Maras A , Ventura G D , Mineralogical Magazine , 57 (1993) p.315-322, Asbecasite: crystal structure refinement and crystal chemistry

 

Physical Properties of Asbecasite

Help on Cleavage: Cleavage: [1010] Good, [1010] Good, [1010] Good
Help on Color: Color: Lemon, Brownish.
Help on Density: Density: 3.7
Help on Diaphaniety: Diaphaniety: Transparent
Help on Habit: Habit: Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Help on Hardness: Hardness: 6.5-7 - Pyrite-Quartz
Help on Luster: Luster: Vitreous (Glassy)
 

Optical Properties of Asbecasite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.041 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.063 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.223,KPDmeas= 0.2284,KC= 0.2381
Help on Optical Data: Optical Data: Uniaxial (-), e=1.83, w=1.86, bire=0.0300.
 

Calculated Properties of Asbecasite

Help on Electron Density: Electron Density:

relectron=3.47 gm/cc
note: rAsbecasite =3.70 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.02576
Boson Index = 0.97424
Help on Photoelectric: Photoelectric:

PEAsbecasite = 38.17 barns/electron
U=PEAsbecasite x relectron= 132.28 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Asbecasite is Not Radioactive

 

Asbecasite Classification

Help on  Dana Class: Dana Class: 45.1.3.1 (45)Acid and normal Antimonites, Arsenites and Phosphites
  (45.1)with miscellaneous formulae
  (45.1.3)Dana Group
 
45.1.3.1 Asbecasite Ca3(Ti,Sn)As6Si2Be2O20 P 3c 3m
Help on  Strunz Class: Strunz Class: VIII/B.11-40 VIII - Silicates
  VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]
  VIII/B.11 - Dixenite - Kraisslite series
 
VIII/B.11-10 Dixenite CuMn14Fe(AsO3)5(SiO4)2(AsO4)(OH)6 R 3 3
 
VIII/B.11-15 Turtmannite! (Mn,Mg)25.5[(V,As)O4]3(SiO4)3[AsO3]xO5-5x(OH)20x R 3c 3 2/m
 
VIII/B.11-20 Mcgovernite Mn9Mg4Zn2As2Si2O17(OH)14 R 3c 3 2/m
 
VIII/B.11-30 Kraisslite (Mn,Mg)24Zn3Fe(AsO3)2(AsO4)3(SiO4)6(OH)18 P 6322 6 2 2
 
VIII/B.11-40 Asbecasite Ca3(Ti,Sn)As6Si2Be2O20 P 3c 3m
 

Other Asbecasite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Asbecasite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Asbecasite

Ca3(Ti,Sn)As+++6Si2Be2O20
Dana No: 45.1.3.1 Strunz No: VIII/B.11-40
Locality:

 

Notes:

 

 
   
 
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