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Silhydrite

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Formula:
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.


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Classification of SilhydriteHide

Approved
Approval Year:
1970
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

Physical Properties of SilhydriteHide

Transparency:
Transparent
Colour:
White
Hardness:
Fracture:
Sub-Conchoidal
Density:
2.141 g/cm3 (Measured)    2.116 g/cm3 (Calculated)

Optical Data of SilhydriteHide

Type:
Biaxial
Dispersion:
relatively weak

Chemical Properties of SilhydriteHide

Formula:
3SiO2 · H2O
IMA Formula:
Si3O6 · H2O
Common Impurities:
Ti,Al,Fe,Mg,Ca,Na,K,Cl,C

Crystallography of SilhydriteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 14.51 Å, b = 18.8 Å, c = 15.93 Å
Ratio:
a:b:c = 0.772 : 1 : 0.847
Unit Cell V:
4,345.51 ų (Calculated from Unit Cell)

Type Occurrence of SilhydriteHide

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.
Place of Conservation of Type Material:
Smithsonian, 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:

Synonyms of SilhydriteHide

Other Language Names for SilhydriteHide

German:Silhydrit
Spanish:Silhydrita

Related Minerals - Nickel-Strunz GroupingHide

4.FM.15FranconiteNa(Nb2O5)(OH) · 3H2OMon.
4.FM.15Hochelagaite(Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2OMon.
4.FM.15Ternovite(Mg,Ca)Nb4O11 · nH2OMon.
4.FM.25BelyankiniteCa1-2(Ti,Nb)5O12 · 9H2O (?)Amor.
4.FM.25Gerasimovskite(Mn,Ca)(Nb,Ti)5O12 · 9H2O
4.FM.25Manganbelyankinite(Mn,Ca)(Ti,Nb)5O12 · 9H2O
4.FM.35CuzticiteFe3+2(TeO6) · 3H2OHex.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.8.1QuartzSiO2Trig. 3 2 : P31 2 1
7.8.2CoesiteSiO2Mon. 2/m : B2/b
7.8.3TridymiteSiO2Tric. 1
7.8.4StishoviteSiO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
7.8.5CristobaliteSiO2Tet. 4 2 2 : P41 21 2
7.8.6LechatelieriteSiO2
7.8.8OpalSiO2 · nH2O
7.8.9MogániteSiO2Mon.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for SilhydriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Gude, A.J., Sheppard, R.A. (1972) Silhydrite, 3SiO2•H2O, a new mineral from Trinity County, California. American Mineralogist: 57: 1053-1065.

Internet Links for SilhydriteHide

Localities for SilhydriteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • California
    • Trinity Co.
      • Klamath Mts
        • Trinity Mts
          • Halls Gulch District
            • Wildcat Peak
Gude, A.J. and Sheppard, R.A. (1972) Silhydrite, 3SiO2 •H2O, a new mineral from Trinity County, California. American Mineralogist: 57: 1053-1065; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 357-358; www.mineralsocal.org.
Mineral and/or Locality  
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