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Farallonite

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Formula:
2MgO · W2O5 · SiO2 · nH2O?
Colour:
Sky blue to white.
Lustre:
Greasy
Crystal System:
Monoclinic
Name:
After the type locality, the Farellon (or Farallon) mine.
An inadequately described mineral that allegedly forms seasonally (summer rainy season) on wolframite-bearing outcrops.
Originally reported from Farallon Mine (Farellon mine), Cerro Tazna, Atocha-Quechisla District, Nor Chichas Province, Potosí Department, Bolivia.


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Unique IdentifiersHide

Mindat ID:
31313
Long-form identifier:
mindat:1:1:31313:1

Similar NamesHide

Classification of FaralloniteHide

Strunz-mindat (2026):
9.HC.30

9 : SILICATES (Germanates)
H : Unclassified silicates
C : With Mn, Fe

Physical Properties of FaralloniteHide

Lustre:
Greasy
Colour:
Sky blue to white.
Fracture:
Conchoidal

Chemistry of FaralloniteHide

Mindat Formula:
2MgO · W2O5 · SiO2 · nH2O?
Element Weights:
Element% weight
W60.635 %
O26.385 %
Mg8.016 %
Si4.632 %
H0.332 %

Calculated from ideal end-member formula.
Elements listed:
H, Mg, O, Si, W - search for minerals with similar chemistry

Crystallography of FaralloniteHide

Crystal System:
Monoclinic

Synonyms of FaralloniteHide

Other Language Names for FaralloniteHide

Spanish:Farallonita

Related Minerals - Strunz-mindat GroupingHide

9.HC.05Erlianite(Fe,Mg)4(Fe,V)2Si6O15(OH,O)8Orth.
9.HC.10BostwickiteCaMn3+6Si3O16 · 7H2OOrth.
9.HC.20'Almbosite'Fe2+5Fe3+4V6+4Si3O27
9.HC.25'Aquacreptite (of Shepard)'Mg4Fe2Si6O19 · 8H2O with some Al2O3, or near
9.HC.35HokoiteMn2+Mn3+2SiO6 · H2O
9.HC.40'Polyhydrite'

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.

Internet Links for FaralloniteHide

References for FaralloniteHide

Localities for FaralloniteHide

Showing 2 localities.

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.
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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
 
  • La Paz
    • Pedro Domingo Murillo Province
Federico Ahlfeld y Jorge Muñoz Reyes (1955)
  • Potosí
    • Nor Chichas Province
      • Cotagaita Municipality
        • Cerro Tazna
Kohanowski (1953)
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