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Bigcreekite

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About BigcreekiteHide

Formula:
BaSi2O5 · 4H2O
Colour:
White to colourless
Lustre:
Vitreous, Pearly
Hardness:
2 - 3
Specific Gravity:
2.66
Crystal System:
Orthorhombic
Name:
For the type locality at the Esquire No. 7 claim, Big Creek, Fresno County, California, USA.
This page provides mineralogical data about Bigcreekite.


Classification of BigcreekiteHide

Approved
Approval Year:
1999
First Published:
2001
9.DF.30

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains

Physical Properties of BigcreekiteHide

Vitreous, Pearly
Colour:
White to colourless
Streak:
White
Hardness:
2 - 3 on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Perfect
{010} and {001}
Fracture:
Irregular/Uneven
Density:
2.66 g/cm3 (Measured)    2.76 g/cm3 (Calculated)

Optical Data of BigcreekiteHide

Type:
Biaxial (+)
RI values:
nα = 1.537 nβ = 1.538 nγ = 1.541
2V:
Measured: 59° , Calculated: 62°
Max Birefringence:
δ = 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v moderate
Pleochroism:
Non-pleochroic

Chemical Properties of BigcreekiteHide

Formula:
BaSi2O5 · 4H2O
Common Impurities:
Ca,Sr,Na

Crystallography of BigcreekiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 5.038 Å, b = 9.024 Å, c = 18.321 Å
Ratio:
a:b:c = 0.558 : 1 : 2.03
Unit Cell V:
833 ų
Z:
4
Twinning:
None mentioned

Type Occurrence of BigcreekiteHide

Place of Conservation of Type Material:
M.Y. Williams Museum at the University of British Columbia, Vancouver, British Columbia.
Geological Setting of Type Material:
In fractures in gneissic rocks.
Associated Minerals at Type Locality:

Synonyms of BigcreekiteHide

Other Language Names for BigcreekiteHide

German:Bigcreekit
Simplified Chinese:水硅钡石
Spanish:Bigcreekita
Traditional Chinese:水矽鋇石

Related Minerals - Nickel-Strunz GroupingHide

9.DF.05Chesterite(Mg,Fe)17Si20O54(OH)6Orth.
9.DF.05Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2Mon.
9.DF.05Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca
9.DF.15ErshoviteNa4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2OTric.
9.DF.15ParaershoviteNa3K3Fe3+2Si8O20(OH)4 · 4H2OTric. 1 : P1
9.DF.20Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2OOrth.
9.DF.25BaveniteCa4Be2Al2Si9O26(OH)2Orth. mm2

Fluorescence of BigcreekiteHide

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 BigcreekiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Basciano, L.C., Groat, L.A., Roberts, A.C., Gault, R.A., Dunning, G.E., Walstrom, R.E. (2001) Bigcreekite: a new barium silicate mineral species from Fresno County, California. The Canadian Mineralogist: 39: 761-768.
Jambor, J.L., Roberts, A.C. (2002) New mineral names. American Mineralogist: 87: 355-358.
Mandarino, J.A. (2002) New minerals. The Canadian Mineralogist: 40: 1001-1020.

Internet Links for BigcreekiteHide

Localities for BigcreekiteHide

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
    • Fresno Co.
      • Big Creek-Rush Creek District
        • Rush Creek deposit
          • Big Creek
[Canadian Mineralogist(2001) 39, 761-768; MinRec 33:161]
          • Rush Creek
    • Mariposa Co.
      • East Belt
        • Clearing House District
          • Clearing House
            • Trumbull Peak
Canadian Mineralogist39:1059-1064
Mineral and/or Locality  
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