Holtstamite Mineral Data


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General Holtstamite Information

Help on Chemical  Formula: Chemical Formula: Ca3(Al,Mn+++)2(SiO4)2(OH)4
Help on Composition: Composition: Molecular Weight = 440.37 gm
   Calcium    27.30 %  Ca   38.20 % CaO
   Manganese   6.24 %  Mn    8.96 % Mn2O3
   Aluminum    9.19 %  Al   17.37 % Al2O3
   Silicon    12.76 %  Si   27.29 % SiO2
   Hydrogen    0.92 %  H     8.18 % H2O
   Oxygen     43.60 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Al1.5Mn3+0.5(SiO4)2(OH)4
Help on Environment: Environment: Garnet group, Al-dominant analogue to henritermierite.
Help on IMA Status: IMA Status: Proposed IMA 2003 (Dana # Added)
Help on Locality: Locality: Wessels mine, Kalahari Mn field, Kuruman Hill, Cape Province, South Africa Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Commission on New Minerals and Mineral Names (CNMMN)
Help on Synonym: Synonym: IMA2003-047
 

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Holtstamite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.967
Help on Cell Dimensions: Cell Dimensions: a = 12.337, c = 11.93, Z = 8; V = 1,815.77 Den(Calc)= 3.22
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 41/acd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.743(1), 1.614(0.56), 2.757(0.55),2.685(0.54), 2.501(0.47), 2.978(0.45), 3.08(0.44),
Click Here for Large Holtstamite Structure Window Crystal Structure:

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Halenius U , Haussermann U , Harryson H , European Journal of Mineralogy , 17 (2005) p.375-382, Holtstamite, Ca3(Al,Mn3+)2(SiO4)3-x(H4O4)x, a new tetragonal hydrogarnet, from Wessels Mine, South Africa, Locality: Wessels Mine, South Africa

 

Physical Properties of Holtstamite

Help on Color: Color: Brownish yellow.
Help on Diaphaniety: Diaphaniety: Transparent
Help on Luster: Luster: Vitreous (Glassy)
 

Optical Properties of Holtstamite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2273,KC= 0.2277
Help on Optical Data: Optical Data: Uniaxial (+), w=1.718, e=1.746, bire=0.0280.
 

Calculated Properties of Holtstamite

Help on Electron Density: Electron Density:

relectron=3.22 gm/cc
note: rHoltstamite =3.22 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00653
Boson Index = 0.99347
Help on Photoelectric: Photoelectric:

PEHoltstamite = 5.67 barns/electron
U=PEHoltstamite x relectron= 18.24 barns/cc.

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

Holtstamite is Not Radioactive

 

Holtstamite Classification

Help on  Dana Class: Dana Class: 51.4.4.2 (51)Nesosilicate Insular SiO4 Groups Only
  (51.4)with cations in [6] and >[6] coordination
  (51.4.4)Dana Group
 
51.4.4.1 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m
 
51.4.4.2 Holtstamite ! Ca3(Al,Mn)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: VIII/AX.00-00 VIII - Silicates
  VIII/AX - Unclassified Strunz Nesosilicates
  VIII/AX.00 - Garnet group
 

Other Holtstamite Information

Help on See Also: See Also: Links to other databases for Holtstamite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Holtstamite Specimen Label here :

Holtstamite

Ca3(Al,Mn+++)2(SiO4)2(OH)4
Dana No: 51.4.4.2 Strunz No: VIII/AX.00-00
Locality:

 

Notes:

 

 
   
 
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