Mineralogy Database

Bigcreekite Mineral Data

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General Bigcreekite Information

Help on Chemical  Formula: Chemical Formula: BaSi2O5•4(H2O)
Help on Composition: Composition: Molecular Weight = 345.56 gm
   Barium    39.74 %  Ba   44.37 % BaO
   Silicon   16.26 %  Si   34.78 % SiO2
   Hydrogen   2.33 %  H    20.85 % H2O
   Oxygen    41.67 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: BaSi2O5•4(H2O)
Help on Environment: Environment: Found in fractures in a sanborite-quartz gneiss. Double-chain silicate; structure.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Esquire no. 7 claim, along Big Creek, Fresno County, California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA1999-015
 

Bigcreekite Image

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  Bigcreekite   Gillespite   Sanbornite

Comments: Tiny white, spherical patterns, halo-like crystals of bigcreekite to about 0.5mm and reddish gillespite in a matrix of pale yellowish sanbornite.
Location: Trumbull Peak, Mariposa Co., California, United States. Scale: 2.5 x 2 x 2cm.
© Tom Loomis / Dakota Matrix

Bigcreekite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5582:1:2.0302
Help on Cell Dimensions: Cell Dimensions: a = 5.038, b = 9.024, c = 18.321, Z = 4; V = 832.93 Den(Calc)= 2.76
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.068(1)(013), 4.054(0.85)(022), 2.257(0.75)(126),2.706(0.6)(124), 2.974(0.45)(031), 2.327(0.4)(035), 9.19(0.3),
 

Physical Properties of Bigcreekite

Help on Cleavage: Cleavage: {001} Perfect, {010} Perfect
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.66
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Bigcreekite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1952,KPDmeas= 0.2025,KC= 0.2
Ncalc = 1.53 - 1.55
Help on Optical Data: Optical Data: Biaxial (+), a=1.537, b=1.538, g=1.541, bire=0.0040, 2V(Calc)=62, 2V(Meas)=59.2. Dispersion r < v moderate.
 

Calculated Properties of Bigcreekite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.52 gm/cc
note: Specific Gravity of Bigcreekite =2.66 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEBigcreekite = 168.55 barns/electron
U=PEBigcreekite x rElectron Density= 425.58 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bigcreekite is Not Radioactive
 

Bigcreekite Classification

Help on  Dana Class: Dana Class: 66.02.01.02 (66)Inosilicate Double-Width Unbranched Chains, W=2
  (66.02)with P=2 non-amphibole configuration
  (66.02.01)Plancheite Group
 
66.02.01.01 Plancheite Cu8Si8O22(OH)4•(H2O) Pcnb 2/m 2/m 2/m
 
66.02.01.02 Bigcreekite! BaSi2O5•4(H2O) P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.DF.30 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DF -Inosilicates with 2-periodic multiple chains
 
09.DF.30 Bigcreekite! BaSi2O5•4(H2O) P nma 2/m 2/m 2/m
 

Other Bigcreekite Information

Help on References: References: NAME( AmMin, Vol 87, p 355) PHYS. PROP.(AmMin, Vol 87, p 355) OPTIC PROP.(AmMin, Vol 87, p 355)
Help on See Also: See Also: Links to other databases for Bigcreekite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Bigcreekite Specimen Label here :

Bigcreekite

BaSi2O5•4(H2O)
Dana No: 66.02.01.02 Strunz No: 09.DF.30
Locality:

 

Notes:

 

 
   
 


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