Mineralogy Database

Gillespite Mineral Data

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General Gillespite Information

Help on Chemical  Formula: Chemical Formula: BaFe++Si4O10
Help on Composition: Composition: Molecular Weight = 465.51 gm
   Barium   29.50 %  Ba   32.94 % BaO
   Iron     12.00 %  Fe   15.43 % FeO
   Silicon  24.13 %  Si   51.63 % SiO2
   Oxygen   34.37 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: BaFe2+Si4O10
Help on Environment: Environment: In a glacial moraine (Dry Delta, Alaska, USA); probably from a contact metamorphic zone (Trumbull Peak, California, USA).
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1922
Help on Locality: Locality: Dry Delta, Alaska Range, Alaska, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Frank Gillespie, of Richardson, Alaska, USA, who discovered the first specimen.
Help on Name Pronunciation: Name Pronunciation: Gillespite + Pronunciation Say GILLESPITE
 

Gillespite Image

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  Anandite   Gillespite

Comments: Black micaceous anandite with dark red gillespite.
Location: Esquire No. 7 Claim, Big Creek, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Gillespite   Pellyite

Comments: Red crystalline gillespite with yellow pellyite rock matrix.
Location: GUN claims, Itsi Mountains, MacMillan Pass Area, Yukon Territory, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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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

Gillespite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.13889
Help on Cell Dimensions: Cell Dimensions: a = 7.5164, c = 16.0768, Z = 4; V = 908.28 Den(Calc)= 3.40
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/ncc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.39(1), 3.22(0.7), 4.41(0.7),
 

Physical Properties of Gillespite

Help on Cleavage: Cleavage: {001} Good, {100} Good, {110} Poor
Help on Color: Color: Red.
Help on Density: Density: 3.33
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
 

Optical Properties of Gillespite

Help on Dichroism (e): Dichroism (e): red.
Help on Dichroism (w): Dichroism (w): colorless.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1824,KPDmeas= 0.1862,KC= 0.1786
Ncalc = 1.59 - 1.61
Help on Optical Data: Optical Data: Uniaxial (-), e=1.619, w=1.621, bire=0.0020.
 

Calculated Properties of Gillespite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.18 gm/cc
note: Specific Gravity of Gillespite =3.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEGillespite = 130.95 barns/electron
U=PEGillespite x rElectron Density= 417.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gillespite is Not Radioactive
 

Gillespite Classification

Help on  Dana Class: Dana Class: 71.02.03.02 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.02)with 2:1 Layers
  (71.02.03)Cuprorivaite group
 
71.02.03.01 Cuprorivaite CaCuSi4O10 P 4/nnc 4/m 2/m 2/m
 
71.02.03.02 Gillespite BaFeSi4O10 P 4/ncc 4/m 2/m 2/m
 
71.02.03.03 Effenbergerite BaCuSi4O10 P 4/nnc 4/m 2/m 2/m
 
71.02.03.04 Wesselsite! SrCuSi4O10 P 4/ncc 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.EA.05 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
 
09.EA.05 Cuprorivaite CaCuSi4O10 P 4/nnc 4/m 2/m 2/m
 
09.EA.05 Effenbergerite BaCuSi4O10 P 4/nnc 4/m 2/m 2/m
 
09.EA.05 Gillespite BaFeSi4O10 P 4/ncc 4/m 2/m 2/m
 
09.EA.05 Wesselsite! SrCuSi4O10 P 4/ncc 4/m 2/m 2/m
 

Other Gillespite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Gillespite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Gillespite

BaFe++Si4O10
Dana No: 71.02.03.02 Strunz No: 09.EA.05
Locality:

 

Notes:

 

 
   
 


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