Bigcreekite
A valid IMA mineral species
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About Bigcreekite
Eckhard D. Stuart at the Esquire No.7
Esquire No. 7 claim, Big Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA
Esquire No. 7 claim, Big Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA
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.
Unique Identifiers
Mindat ID:
7083
Long-form identifier:
mindat:1:1:7083:2
GUID
(UUID V4):
(UUID V4):
2fcd2e2a-de0c-4270-b045-f7b6af697e3c
IMA Classification of Bigcreekite
Classification of Bigcreekite
9.DF.30
9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
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 |
|---|---|---|
| Big | 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 Bigcreekite
Vitreous, Pearly
Colour:
White to colourless
Streak:
White
Hardness:
2 - 3 on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Perfect
{010} and {001}
{010} and {001}
Fracture:
Irregular/Uneven
Density:
2.66 g/cm3 (Measured) 2.76 g/cm3 (Calculated)
Optical Data of Bigcreekite
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.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r < v moderate
Pleochroism:
Non-pleochroic
Chemistry of Bigcreekite
Mindat Formula:
BaSi2O5 · 4H2O
Elements listed:
Common Impurities:
Ca,Sr,Na
Crystallography of Bigcreekite
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
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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CIF File Best | x | y | z | a | b | c
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005718 | Bigcreekite | 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 |  | 2001 | Fresno County, California, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.068 Å | (100) |
| 4.054 Å | (85) |
| 2.257 Å | (75) |
| 2.706 Å | (60) |
| 2.974 Å | (45) |
| 2.327 Å | (40) |
| 9.19 Å | (30) |
Comments:
Big Creek, California, USA. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] |
Type Occurrence of Bigcreekite
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 Bigcreekite
Other Language Names for Bigcreekite
German:Bigcreekit
Russian:Бигкрикит
Simplified Chinese:水硅钡石
Spanish:Bigcreekita
Traditional Chinese:水矽鋇石
Common Associates
Associated Minerals Based on Photo Data:
| 2 photos of Bigcreekite associated with Quartz | SiO2 |
| 1 photo of Bigcreekite associated with Sanbornite | Ba2(Si4O10) |
Related Minerals - Strunz-mindat Grouping
| 9.DF. | Bohseite | Ca4Be3+xAl1-xSi9O25-x(OH)3+x |
| 9.DF.05 | Chesterite | (Mg,Fe)17Si20O54(OH)6 |
| 9.DF.05 | Clinojimthompsonite | (Mg,Fe)5Si6O16(OH)2 |
| 9.DF.05 | Jimthompsonite | (Mg,Fe)5Si6O16(OH)2 |
| 9.DF.15 | Ershovite | Na4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2O |
| 9.DF.15 | Paraershovite | Na3K3Fe3+2Si8O20(OH)4 · 4H2O |
| 9.DF.20 | Tvedalite | (Ca,Mn)4Be3Si6O17(OH)4 · 3H2O |
| 9.DF.25 | Bavenite | Ca4Be2Al2Si9O26(OH)2 |
Fluorescence of Bigcreekite
None
Other Information
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 Bigcreekite
mindat.org URL:
https://www.mindat.org/min-7083.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Bigcreekite
Reference List:
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 (3) 761-768 doi:10.2113/gscanmin.39.3.761
Localities for Bigcreekite
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
USA (TL) | |
| Walstrom (n.d.) +2 other references |
| Walstrom (n.d.) |
| Roberts et al. (2001) |
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Esquire No. 7 claim, Big Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA