Silhydrite (original) (raw)
A valid IMA mineral species
About SilhydriteHide
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Also written as 3SiO2 · H2O.
Crystal System:
Orthorhombic
Name:
Named for its composition: silicon plus water.
This page provides mineralogical data about Silhydrite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:3658:6
c6fd3545-66f8-470f-8978-557789e64a2e
IMA Classification of SilhydriteHide
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Type description reference:
Classification of SilhydriteHide
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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
75.2.4.1
75 : TECTOSILICATES Si Tetrahedral Frameworks
2 : Si Tetrahedral Frameworks - SiO2 with H2O and organics
7.8.7
7 : Oxides and Hydroxides
8 : Oxides of Si
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Shy | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of SilhydriteHide
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Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
2.141 g/cm3 (Measured) 2.116 g/cm3 (Calculated)
Optical Data of SilhydriteHide
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Dispersion:
relatively weak
Chemistry of SilhydriteHide
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Mindat Formula:
Si3O6 · H2O
Also written as 3SiO2 · H2O.
Common Impurities:
Ti,Al,Fe,Mg,Ca,Na,K,Cl,C
Crystallography of SilhydriteHide
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Crystal System:
Orthorhombic
Cell Parameters:
a = 14.519(5) Å, b = 18.80(1) Å, c = 15.98(4) Å
Ratio:
a:b:c = 0.772 : 1 : 0.85
Unit Cell V:
4,361.86 ų (Calculated from Unit Cell)
Comment:
Point Group: n.d.; Space Group: n.d.
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 14.50 Å | (100) |
| 3.424 Å | (82) |
| 3.143 Å | (35) |
| 3.627 Å | (27) |
| 3.540 Å | (25) |
| 7.31 Å | (22) |
| 7.07 Å | (21) |
Geological EnvironmentHide
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Type Occurrence of SilhydriteHide
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General Appearance of Type Material:
White, soft, microcrystalline massive material. Material is porous and will float on water briefly when dry (0.65 bulk density). Crystals less than 4 microns in size.
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 125042.
USGS Denver Colorado.
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.
Associated Minerals at Type Locality:
Reference:
Gude, A.J., Sheppard, R.A. (1972) Silhydrite, 3SiO2•H2O, a new mineral from Trinity County, California. American Mineralogist: 57: 1053-1065.
Synonyms of SilhydriteHide
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Other Language Names for SilhydriteHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 4.FM. | Charleshatchettite | CaNb4O10(OH)2 · 8H2O | Mon. 2/m : _B_2/b |
|---|---|---|---|
| 4.FM. | Dinilawiite | [Pb4O2Al(OH)5]2(S2O3)2 · H2(S2O3)(H2O)5 | Mon. 2/m |
| 4.FM. | Yttrotungstite-(Nd) | NdW2O7(OH) · H2O | Mon. 2/m : _P_21/m |
| 4.FM.15 | Franconite | Na(Nb2O5)(OH) · 3H2O | Mon. |
| 4.FM.15 | Hochelagaite | (Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2O | Mon. |
| 4.FM.15 | Ternovite | (Mg,Ca)Nb4O11 · nH2O | Mon. |
| 4.FM.25 | Belyankinite | Ca1-2(Ti,Nb)5O12 · 9H2O (?) | Amor. |
| 4.FM.25 | Gerasimovskite | (Mn,Ca)(Nb,Ti)5O12 · 9H2O | Amor. |
| 4.FM.25 | Manganbelyankinite | (Mn,Ca)(Ti,Nb)5O12 · 9H2O | |
| 4.FM.35 | Cuzticite | Fe3+2(TeO6) · 3H2O | Hex. |
| 4.FM.50 | Qatranaite | CaZn2(OH)6(H2O)2 | Mon. 2/m : _P_21/b |
| 4.FM.55 | Hydroplumbite | 3PbO · H2O |
Other InformationHide
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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for SilhydriteHide
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References for SilhydriteHide
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Localities for SilhydriteHide
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This 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.
Locality ListHide
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 
- Good crystals or important locality for species. 
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
| Bolivia | |
|---|---|
| Potosí Nor Lípez Province San Juan ⓘ Cachilaguna (Cachi Laguna; Laguna Cachi) | Abdelouas et al. (1995) |
| USA | |
| California Siskiyou County ⓘ Lava Beds National Monument | Rogers et al. (1991) |
| ⓘ Gaping Hole/Arch Sink Cave | Onac et al. (2011) |
| ⓘ Mammoth Cave | Onac et al. (2011) |
| ⓘ Table Mountain Cave | Onac et al. (2011) |
| Trinity County Klamath Mountains Trinity Mountains Halls Gulch Mining District Wildcat Peak ⓘ Trinity Mining claim (TL) | Gude et al. (1972) |
| Oregon Malheur County ⓘ Rome | webmineral.com (n.d.) +1 other reference |
| Washington Pierce County ⓘ West Side debris flows | Rye et al. (2003) |