Mineralogy Database

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 = 455.40 gm
   Calcium    26.40 %  Ca   36.94 % CaO
   Manganese   8.20 %  Mn   11.79 % Mn2O3
   Aluminum    5.63 %  Al   10.63 % Al2O3
   Iron        4.54 %  Fe    6.49 % Fe2O3
   Silicon    12.33 %  Si   26.39 % SiO2
   Hydrogen    0.88 %  H     7.83 % H2O
   Oxygen     42.02 %  O
             ______        ______ 
             100.00 %      100.07 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Al0.95Mn3+0.68Fe3+0.37(SiO4)20.99(H4O4)
Help on Environment: Environment: Scarce, rounded grains within vesuvianite. Garnet group, Al-dominant analogue to henritermierite.
Help on IMA Status: IMA Status: Approved 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: Named after Dr. Dan Holtstam (b. 1963) in honor of his contributions to Swedish mineralogy and specifically of Mn-deposits of the L´┐Żngban type.
Help on Synonym: Synonym: IMA2003-047
 

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)= 3.33
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-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)(402), 1.614(0.56)(426), 2.757(0.55)(420),2.685(0.54)(204), 2.501(0.47)(422), 2.978(0.45)(004), 3.082(0.44)(400), 1.633(0.39)(624), 1.671(0.37)(406),
 

Physical Properties of Holtstamite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish yellow.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Holtstamite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.073 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2198,KC= 0.237
Ncalc = 1.79
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: Bulk Density (Electron Density)=3.31 gm/cc
note: Specific Gravity of Holtstamite =3.33 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0072814926
Boson Index = 0.9927185074
Help on Photoelectric: Photoelectric: PEHoltstamite = 7.28 barns/electron
U=PEHoltstamite x rElectron Density= 24.11 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: 51.04.04.02 (51)Nesosilicate Insular SiO4 Groups Only
  (51.04)with cations in [6] and >[6] coordination
  (51.04.04)Garnet group (Tetragonal Hydrogarnet)
 
51.04.04.01 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m
 
51.04.04.02 Holtstamite! Ca3(Al,Mn)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AD.25 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AD -Nesosilicates without additional anions;
 
09.AD.25 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m
 
09.AD.25 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m
 
09.AD.25 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m
 
09.AD.25 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m
 
09.AD.25 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m
 
09.AD.25 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m
 
09.AD.25 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m
 
09.AD.25 Wadalite Ca6Al5Si2O16Cl3 I 43d 4 3m
 
09.AD.25 Holtstamite! Ca3(Al,Mn)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m
 

Other Holtstamite Information

Help on References: References: NAME( AmMin, v90, p1946) PHYS. PROP.(AmMin, v90, p1946) OPTIC PROP.(AmMin, v90, p1946)
Help on See Also: See Also: Links to other databases for Holtstamite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Holtstamite

Ca3(Al,Mn+++)2(SiO4)2(OH)4
Dana No: 51.04.04.02 Strunz No: 09.AD.25
Locality:

 

Notes:

 

 
   
 


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