Gillespite Mineral Data

Gillespite Mineral Data +

General Gillespite Information

Chemical Formula:

BaFe++Si4O10

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

Empirical Formula:

BaFe²⁺Si₄O₁₀

IMA Status:

Valid Species (Pre-IMA) 1922

Locality:

Dry Delta, Alaska Range, Alaska, USA. Link to MinDat.org Location Data.

Gillespite Image

Images:

Gillespite Anandite

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

Images:

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

Images:

Gillespite Bigcreekite 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

Axial Ratios:

a:c = 1:2.13889

Cell Dimensions:

a = 7.5164, c = 16.0768, Z = 4; V = 908.28 Den(Calc)= 3.40

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/ncc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.39(1), 3.22(0.7), 4.41(0.7),

Crystal Structure:

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Pabst A , American Mineralogist , 28 (1943) p.372-390, Crystal structure of gillespite, BaFeSi4O10

View Additional jPOWD Structure files for Gillespite
[1] [10] [11] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Gillespite

Cleavage:

[001] Good, [100] Good

Color:

Red.

Density:

3.33

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Optical Properties of Gillespite

Dichroism (e):

red.

Dichroism (w):

colorless.

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

Optical Data:

Uniaxial (-), e=1.619, w=1.621, bire=0.0020.

Calculated Properties of Gillespite

Electron Density:

r_electron=3.18 gm/cc
note: r_Gillespite=3.40 gm/cc.

Fermion Index

Fermion Index = 0.06655
Boson Index = 0.93345

Photoelectric:

PE_Gillespite= 130.95 barns/electron
U=PE_Gillespite x r_electron= 417.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gillespite is Not Radioactive

Gillespite Classification

Dana Class:

71.2.3.2 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.3)Cuprorivaite group

71.2.3.1 Cuprorivaite CaCuSi4O10 P 4/nnc 4/m 2/m 2/m

71.2.3.2 Gillespite BaFeSi4O10 P 4/ncc 4/m 2/m 2/m

71.2.3.3 Effenbergerite BaCuSi4O10 P 4/nnc 4/m 2/m 2/m

71.2.3.4 Wesselsite! SrCuSi4O10 P 4/ncc 4/m 2/m 2/m

Strunz Class:

VIII/H.02-40 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.02 - Davanite - Dalyite series

VIII/H.02-10 Cuprorivaite CaCuSi4O10 P 4/nnc 4/m 2/m 2/m

VIII/H.02-20 Wesselsite! SrCuSi4O10 P 4/ncc 4/m 2/m 2/m

VIII/H.02-30 Effenbergerite BaCuSi4O10 P 4/nnc 4/m 2/m 2/m

VIII/H.02-40 Gillespite BaFeSi4O10 P 4/ncc 4/m 2/m 2/m

VIII/H.02-50 Sanbornite BaSi2O5 Pmnb 2/m 2/m 2/m

VIII/H.02-60 Bigcreekite! BaSi2O5·4(H2O) P nma 2/m 2/m 2/m

Other Gillespite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Gillespite

BaFe++Si4O10
Dana No: 71.2.3.2 Strunz No: VIII/H.02-40
Locality:

Notes: