Gillespite Mineral Data

[Localities] [Carat Weight] [Special Collections] [Diamond Lots] [Ordering Info]
See Also: [Excalibur Minerals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Special Collections of Rough Diamonds for Researchers and Collectors
Unparalled diversity of specimens from different locations

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

Environment:

In a glacial moraine (Dry Delta, Alaska, USA); probably from a contact metamorphic zone (Trumbull Peak, California, USA).

IMA Status:

Valid Species (Pre-IMA) 1922

Locality:

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

Name Origin:

Named for Frank Gillespie, of Richardson, Alaska, USA, who discovered the first specimen.

Name Pronunciation:

Gillespite + Pronunciation

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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, {110} Poor

Color:

Red.

Density:

3.33

Diaphaneity:

Transparent to translucent

Fracture:

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

Habit:

Aggregates - Made of numerous individual crystals or clusters.

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
Ncalc = 1.59 - 1.61

Optical Data:

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

Calculated Properties of Gillespite

Electron Density:

Bulk Density (Electron Density)=3.18 gm/cc
note: Specific Gravity of Gillespite =3.40 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Gillespite= 130.95 barns/electron
U=PE_Gillespite x rElectron Density= 417.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gillespite is Not Radioactive

Gillespite Classification

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

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Gillespite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Gillespite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Gillespite Mineral Data :

Ask about Gillespite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: