Classification of Silhydrite |
| IMA status: | Approved 1970 |
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| Strunz 8th edition ID: | 8/H.39-10
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| Nickel-Strunz 10th (pending) edition ID: | 4.FM.30
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates) F : Hydroxides (without V or U) M : Hydroxides with H2O +- (OH); unclassified |
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| Dana 8th edition ID: | 75.2.4.1
75 : TECTOSILICATES Si Tetrahedral Frameworks 2 : Si Tetrahedral Frameworks - SiO2 with H2O and organics |
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| Hey's CIM Ref.: | 7.8.7
7 : Oxides and Hydroxides 8 : Oxides of Si |
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| mindat.org URL: | http://www.mindat.org/min-3658.html Please feel free to link to this page. |
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Type Occurrence of Silhydrite |
| Type Locality: | Trinite Mining Claim, Trinity Center, Trinity Co., California, USA |
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| General Appearance of Type Material: | White, soft, microcrystalline massive material. Material is punky and will float on water when dry (0.65 bulk density). Crystals less than 4 microns in size. |
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| Place of Conservation of Type Material: | Smithsonian, USGS Denver Colorado |
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| Year of Discovery: | 1972 |
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| Geological Setting of type material: | Spring deposit. Formed by leaching of sodium from magadiite from a cold, highly alkaline brine spring.
Also found in caves. |
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| Associated Minerals at type locality: | |
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Physical Properties of Silhydrite |
| Diaphaneity (Transparency): | Transparent |
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| Colour: | White |
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| Hardness (Mohs): | 1 |
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| Fracture: | Sub-Conchoidal |
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| Density (measured): | 2.141 g/cm3 |
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| Density (calculated): | 2.116 g/cm3 |
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Crystallography of Silhydrite |
| Crystal System: | Orthorhombic |
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| Cell Parameters: | a = 14.51Å, b = 18.8Å, c = 15.93Å
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| Ratio: | a:b:c = 0.772 : 1 : 0.847 |
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| Unit Cell Volume: | V 4,345.51 ų (Calculated from Unit Cell) |
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Optical Data of Silhydrite |
| Type: | Biaxial |
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| Dispersion: | relatively weak |
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Chemical Properties of Silhydrite |
| Formula: | |
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| Essential elements: | H, O, Si |
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| All elements listed in formula: | H, O, Si |
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| Common Impurities: | Ti,Al,Fe,Mg,Ca,Na,K,Cl,C |
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Relationship of Silhydrite to other Species |
Related Minerals - Nickel-Strunz Grouping):
- + | |
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Related Minerals - Hey's Index Grouping:
- + | |
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Other Names for Silhydrite |
| 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 Silhydrite |
| Reference List: | Gude, A.J. & R.A. Sheppard (1972), Silhydrite, 3SiO2•H2O, a new mineral from Trinity County, California: American Mineralogist: 57: 1053-1065.
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Internet Links for Silhydrite |
| Search Engines: |
Look for Silhydrite on Google
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| External Links: | Look for Silhydrite on WebmineralLook for Silhydrite on Athena MineralogyLook for Silhydrite on WikipediaLook for Silhydrite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Silhydrite in the Natural History Museum (London) online catalogueSilhydrite details from Handbook of Mineralogy (PDF) |
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| Jobs: | Mining & Geology Jobs |
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Localities for Silhydrite |
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
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