Silhydrite
A valid IMA mineral species
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About Silhydrite
Formula:
Si3O6 · H2O
Also written as 3SiO2 · H2O.
Colour:
White
Hardness:
1
Specific Gravity:
2.141
Crystal System:
Orthorhombic
Name:
Named for its composition: silicon plus water.
This page provides mineralogical data about Silhydrite.
Unique Identifiers
Mindat ID:
3658
Long-form identifier:
mindat:1:1:3658:6
GUID
(UUID V4):
(UUID V4):
c6fd3545-66f8-470f-8978-557789e64a2e
IMA Classification of Silhydrite
Approved
Approval year:
1970
First published:
1972
Classification of Silhydrite
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
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
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
7 : Oxides and Hydroxides
8 : Oxides of Si
Mineral Symbols
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 Silhydrite
Transparency:
Transparent
Colour:
White
Streak:
White
Hardness:
1 on Mohs scale
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
2.141 g/cm3 (Measured) 2.116 g/cm3 (Calculated)
Optical Data of Silhydrite
Type:
Biaxial
Dispersion:
relatively weak
Chemistry of Silhydrite
Mindat Formula:
Si3O6 · H2O
Also written as 3SiO2 · H2O.
Also written as 3SiO2 · H2O.
Elements listed:
Common Impurities:
Ti,Al,Fe,Mg,Ca,Na,K,Cl,C
Crystallography of Silhydrite
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)
Z:
28
Comment:
Point Group: n.d.; Space Group: n.d.
X-Ray Powder Diffraction
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
48 : Soil leaching zone minerals | <0.6 |
Type Occurrence of Silhydrite
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.
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 Silhydrite
Other Language Names for Silhydrite
German:Silhydrit
Spanish:Silhydrita
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
4.FM. | Charleshatchettite | CaNb4O10(OH)2 · 8H2O |
4.FM. | Dinilawiite | [Pb4O2Al(OH)5]2(S2O3)2 · H2(S2O3)(H2O)5 |
4.FM. | Yttrotungstite-(Nd) | NdW2O7(OH) · H2O |
4.FM.15 | Franconite | Na(Nb2O5)(OH) · 3H2O |
4.FM.15 | Hochelagaite | (Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2O |
4.FM.15 | Ternovite | (Mg,Ca)Nb4O11 · nH2O |
4.FM.25 | Belyankinite | Ca1-2(Ti,Nb)5O12 · 9H2O (?) |
4.FM.25 | Gerasimovskite | (Mn,Ca)(Nb,Ti)5O12 · 9H2O |
4.FM.25 | Manganbelyankinite | (Mn,Ca)(Ti,Nb)5O12 · 9H2O |
4.FM.35 | Cuzticite | Fe3+2(TeO6) · 3H2O |
4.FM.50 | Qatranaite | CaZn2(OH)6(H2O)2 |
4.FM.55 | Hydroplumbite | 3PbO · H2O |
Other Information
Notes:
Insoluble in water
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 Silhydrite
mindat.org URL:
https://www.mindat.org/min-3658.html
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Please feel free to link to this page.
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References for Silhydrite
Reference List:
Localities for Silhydrite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Bolivia | |
| Abdelouas et al. (1995) |
USA | |
| Rogers et al. (1991) |
Onac et al. (2011) | |
Onac et al. (2011) | |
Onac et al. (2011) | |
| Gude et al. (1972) |
| webmineral.com (n.d.) +1 other reference |
| Rye et al. (2003) |
Quick NavTopAbout SilhydriteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Trinity County, California, USA