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Holtstamite Mineral Data
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General Holtstamite Information
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 Chemical Formula: |
Ca3(Al,Mn+++)2(SiO4)2(OH)4 |
| Composition: |
Molecular Weight = 455.40 gm |
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Calcium 26.40 % Ca 36.94 % CaO |
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Manganese 8.20 % Mn 11.79 % Mn2O3 |
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Aluminum 5.63 % Al 10.63 % Al2O3 |
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Iron 4.54 % Fe 6.49 % Fe2O3 |
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Silicon 12.33 % Si 26.39 % SiO2 |
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Hydrogen 0.88 % H 7.83 % H2O |
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Oxygen 42.02 % O |
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______ ______ |
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100.00 % 100.07 % = TOTAL OXIDE |
| Empirical Formula: |
Ca3Al0.95Mn3+0.68Fe3+0.37(SiO4)20.99(H4O4) |
| Environment: |
Scarce, rounded grains within vesuvianite. Garnet group, Al-dominant analogue to henritermierite. |
| IMA Status: |
Approved IMA 2003 (Dana # Added) |
| Locality: |
Wessels mine, Kalahari Mn field, Kuruman Hill, Cape Province, South Africa Link to MinDat.org Location Data. |
| 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�ngban type. |
| Synonym: |
IMA2003-047 |
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Holtstamite Crystallography
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| Axial Ratios: |
a:c = 1:0.967 |
| Cell Dimensions: |
a = 12.337, c = 11.93, Z = 8; V = 1,815.77 Den(Calc)= 3.33 |
| Crystal System: |
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/acd |
| 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), |
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Physical Properties of Holtstamite
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| Cleavage: |
None |
| Color: |
Brownish yellow. |
| Diaphaneity: |
Transparent |
| Fracture: |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Hardness: |
6 - Orthoclase |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties of Holtstamite
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| Gladstone-Dale: |
CI calc= 0.073 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2198,KC= 0.237
Ncalc = 1.79 |
| Optical Data: |
Uniaxial (+), w=1.718, e=1.746, bire=0.0280. |
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Calculated Properties of Holtstamite
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| Electron Density: |
Bulk Density (Electron Density)=3.31 gm/cc
note: Specific Gravity of Holtstamite =3.33 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0072814926
Boson Index = 0.9927185074 |
| Photoelectric: |
PEHoltstamite = 7.28 barns/electron
U=PEHoltstamite x rElectron Density= 24.11 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Holtstamite is Not Radioactive |
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Holtstamite Classification
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| Dana Class: |
51.04.04.02 (51)Nesosilicate Insular SiO4 Groups Only |
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(51.04)with cations in [6] and >[6] coordination |
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(51.04.04)Garnet group (Tetragonal Hydrogarnet) |
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51.04.04.01 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m |
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51.04.04.02 Holtstamite! Ca3(Al,Mn)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m |
| Strunz Class: |
09.AD.25 09 - SILICATES (Germanates) |
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09.A - Nesosilicates |
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09.AD -Nesosilicates without additional anions; |
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09.AD.25 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m |
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09.AD.25 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m |
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09.AD.25 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m |
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09.AD.25 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m |
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09.AD.25 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m |
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09.AD.25 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m |
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09.AD.25 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m |
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09.AD.25 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m |
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09.AD.25 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m |
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09.AD.25 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m |
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09.AD.25 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m |
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09.AD.25 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m |
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09.AD.25 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m |
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09.AD.25 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m |
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09.AD.25 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m |
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09.AD.25 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m |
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09.AD.25 Wadalite Ca6Al5Si2O16Cl3 I 43d 4 3m |
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09.AD.25 Holtstamite! Ca3(Al,Mn)2(SiO4)2(OH)4 I 41/acd 4/m 2/m 2/m |
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Other Holtstamite Information
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| References: |
NAME( AmMin, v90, p1946) PHYS. PROP.(AmMin, v90, p1946) OPTIC PROP.(AmMin, v90, p1946) |
| 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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Print or Cut-and-Paste your Holtstamite Specimen Label here :
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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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