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Silhydrite

A valid IMA mineral species
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About SilhydriteHide

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 IdentifiersHide

Mindat ID:
3658
Long-form identifier:
mindat:1:1:3658:6
GUID
(UUID V4):
c6fd3545-66f8-470f-8978-557789e64a2e

IMA Classification of SilhydriteHide

Classification of SilhydriteHide

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

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
ShyIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of SilhydriteHide

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

Optical Data of SilhydriteHide

Type:
Biaxial
Dispersion:
relatively weak

Chemistry of SilhydriteHide

Mindat Formula:
Si3O6 · H2O

Also written as 3SiO2 · H2O.
Common Impurities:
Ti,Al,Fe,Mg,Ca,Na,K,Cl,C

Crystallography of SilhydriteHide

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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere<0.6
48 : Soil leaching zone minerals<0.6

Type Occurrence of SilhydriteHide

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

Other Language Names for SilhydriteHide

German:Silhydrit
Spanish:Silhydrita

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Silhydrite associated with MagadiiteNa2Si14O29 · 11H2O
2 photos of Silhydrite associated with KenyaiteNa2Si22O41(OH)8 · 6H2O

Related Minerals - Strunz-mindat GroupingHide

4.FM.CharleshatchettiteCaNb4O10(OH)2 · 8H2OMon. 2/m : B2/b
4.FM.Dinilawiite[Pb4O2Al(OH)5]2(S2O3)2 · H2(S2O3)(H2O)5Mon. 2/m
4.FM.Yttrotungstite-(Nd)NdW2O7(OH) · H2OMon. 2/m : P21/m
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 · 9H2OAmor.
4.FM.25Manganbelyankinite(Mn,Ca)(Ti,Nb)5O12 · 9H2O
4.FM.35CuzticiteFe3+2(TeO6) · 3H2OHex.
4.FM.50QatranaiteCaZn2(OH)6(H2O)2Mon. 2/m : P21/b
4.FM.55Hydroplumbite3PbO · H2O

Other InformationHide

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 SilhydriteHide

References 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 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
Abdelouas et al. (1995)
USA
 
  • California
    • Siskiyou County
Rogers et al. (1991)
Onac et al. (2011)
Onac et al. (2011)
Onac et al. (2011)
    • Trinity County
      • Klamath Mountains
        • Trinity Mountains
          • Halls Gulch Mining District
            • Wildcat Peak
Gude et al. (1972)
  • Oregon
    • Malheur County
webmineral.com (n.d.) +1 other reference
  • Washington
    • Pierce County
Rye et al. (2003)
 
Mineral and/or Locality  
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