Classification of Holtstamite |
| IMA status: | Approved 2003 |
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| Nickel-Strunz 10th (pending) edition ID: | 9.AD.25
9 : SILICATES (Germanates) A : Nesosilicates D : Nesosilicates without additional anions; cations in [6] and/or greater coordination |
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| mindat.org URL: | http://www.mindat.org/min-27532.html Please feel free to link to this page. |
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Type Occurrence of Holtstamite |
| Type Locality: | Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa |
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| Geological Setting of type material: | Calc-silicate skarn. |
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| Associated Minerals at type locality: | |
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Physical Properties of Holtstamite |
| Lustre: | Vitreous |
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| Diaphaneity (Transparency): | Transparent |
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| Colour: | Brownish-yellow |
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Crystallography of Holtstamite |
| Crystal System: | Tetragonal |
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| Class (H-M): | 4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal |
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| Space Group: | I41/acd {I41/a 2/c 2/d} |
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| Cell Parameters: | a = 12.337Å, c = 11.93Å
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| Ratio: | a:c = 1 : 0.967 |
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| Unit Cell Volume: | V 1,815.76 ų (Calculated from Unit Cell) |
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| X-Ray Powder Diffraction: | | d-spacing | | Intensity | | 3.08 | | (44) | | 2.978 | | (45) | | 2.757 | | (55) | | 2.743 | | (100) | | 2.685 | | (54) | | 2.501 | | (47) | | 1.614 | | (56) |
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Optical Data of Holtstamite |
| Type: | Uniaxial (+) |
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| RI values: | nω = 1.718 nε = 1.746 |
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| Maximum Birefringence: | δ = 0.028
 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | High |
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Chemical Properties of Holtstamite |
| Formula: | |
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| All elements listed in formula: | Al, Ca, H, Mn, O, Si |
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Relationship of Holtstamite to other Species |
Related Minerals - Nickel-Strunz Grouping):
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Other Names for Holtstamite |
| Synonyms: | |
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| Other Languages: | |
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Other Information |
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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References for Holtstamite |
Reference List:
- + | Halenius, U., Haeussermann, U., and Harryson, H. (2005) Holtstamite, Ca3(Al,Mn 3+)2(SiO4)3-x(H4O4)x, a new tetragonal hydrogarnet from Wessels Mine, South Africa. European Journal of Mineralogy: 17(2): 375-382.
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Internet Links for Holtstamite |
| Search Engines: |
Look for Holtstamite on Google
Look for Holtstamite images on Google |
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| External Links: | Look for Holtstamite on WebmineralLook for Holtstamite on Athena MineralogyLook for Holtstamite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure Database |
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| Jobs: | Mining & Geology Jobs |
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Localities for Holtstamite |
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the  symbol to view information about a locality.
The  symbol next to localities in the list
can be used to jump to that position on the map.
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