Gillespite
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About Gillespite
Formula:
BaFe2+Si4O10
Hardness:
4
Crystal System:
Tetragonal
Member of:
Name:
Named in 1922 by Waldemar T. Schaller in honor of Mr. Frank Gillespie of Richardson, Alaska who collected the type specimen from a moraine near a claim he had staked.
Type Locality:
This page provides mineralogical data about Gillespite.
Classification of Gillespite
Approved, 'Grandfathered' (first described prior to 1959)
8/H.02-40
9.EA.05
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
71.2.3.2
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
14.7.7
14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn
Pronounciation of Gillespite
Pronounciation:
Play | Recorded by | Country |
---|---|---|
Jolyon & Katya Ralph | United Kingdom |
Physical Properties of Gillespite
Hardness:
4 on Mohs scale
Optical Data of Gillespite
Type:
Uniaxial (-)
RI values:
nω = 1.621 nε = 1.619
Max Birefringence:
δ = 0.002

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:
Moderate
Chemical Properties of Gillespite
Formula:
BaFe2+Si4O10
Elements listed:
Common Impurities:
Al,Mn
Crystallography of Gillespite
Crystal System:
Tetragonal
Cell Parameters:
a = 7.49 Å, c = 16.05 Å
Ratio:
a:c = 1 : 2.143
Unit Cell V:
900.41 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Image Loading
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Type Occurrence of Gillespite
Other Language Names for Gillespite
Relationship of Gillespite to other Species
Member of:
Other Members of this group:
Cuprorivaite | CaCuSi4O10 | Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc |
Effenbergerite | BaCuSi4O10 | Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc |
Wesselsite | SrCuSi4O10 | Tet. |
Common Associates
Associated Minerals Based on Photo Data:
Sanbornite | 43 photos of Gillespite associated with Sanbornite on mindat.org. |
Celsian | 5 photos of Gillespite associated with Celsian on mindat.org. |
Pellyite | 4 photos of Gillespite associated with Pellyite on mindat.org. |
Taramellite | 3 photos of Gillespite associated with Taramellite on mindat.org. |
Titantaramellite | 3 photos of Gillespite associated with Titantaramellite on mindat.org. |
Quartz | 3 photos of Gillespite associated with Quartz on mindat.org. |
Alforsite | 2 photos of Gillespite associated with Alforsite on mindat.org. |
Sulphur | 2 photos of Gillespite associated with Sulphur on mindat.org. |
Anandite | 1 photo of Gillespite associated with Anandite on mindat.org. |
Related Minerals - Nickel-Strunz Grouping
9.EA.05 | Cuprorivaite | CaCuSi4O10 | Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc |
9.EA.05 | Effenbergerite | BaCuSi4O10 | Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc |
9.EA.05 | Wesselsite | SrCuSi4O10 | Tet. |
9.EA.10 | Ekanite | Ca2ThSi8O20 | Tet. 4 2 2 : I4 2 2 |
9.EA.15 | Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O | Tet. 4/mmm (4/m 2/m 2/m) : P4/mnc |
9.EA.15 | Hydroxyapophyllite-(K) | KCa4(Si8O20)(OH,F) · 8H2O | Tet. |
9.EA.15 | Fluorapophyllite-(Na) | NaCa4(Si8O20)F · 8H2O | Orth. |
9.EA.20 | Magadiite | Na2Si14O29 · 11H2O | Mon. |
9.EA.25 | Dalyite | K2ZrSi6O15 | Tric. |
9.EA.25 | Davanite | K2TiSi6O15 | Tric. |
9.EA.30 | Sazhinite-(Ce) | Na2CeSi6O14•6H2O | |
9.EA.30 | Sazhinite-(La) | Na3La[Si6O15] · 2H2O | Orth. mm2 : Pmm2 |
9.EA.35 | Armstrongite | CaZr[Si6O15] · 3H2O | Mon. |
9.EA.40 | Okenite | Ca10Si18O46 · 18H2O | Tric. 1 : P1 |
9.EA.45 | Nekoite | Ca3Si6O15·7H2O | Tric. 1 : P1 |
9.EA.50 | Cavansite | Ca(VO)Si4O10 · 4H2O | Orth. mmm (2/m 2/m 2/m) |
9.EA.55 | Pentagonite | Ca(VO)Si4O10 · 4H2O | Orth. mm2 |
9.EA.60 | Penkvilksite | Na4Ti2Si8O22 · 4H2O | Orth. mmm (2/m 2/m 2/m) : Pbcn |
9.EA.60 | Tumchaite | Na2Zr(Si4O11) · 2H2O | Mon. |
9.EA.65 | Nabesite | Na2BeSi4O10 · 4H2O | Orth. 2 2 2 : P21 21 21 |
9.EA.70 | Ajoite | (K,Na)Cu7AlSi9O24(OH)6 · 3H2O | Tric. |
9.EA.75 | Zeravshanite | Na2Cs4Zr3[Si18O45]*2H2O | Mon. 2/m : B2/b |
9.EA.80 | Bussyite-(Ce) | (Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4 | Mon. 2/m : B2/b |
9.EA.85 | Plumbophyllite | Pb2Si4O10 · H2O | Orth. mmm (2/m 2/m 2/m) : Pbcn |
Related Minerals - Dana Grouping (8th Ed.)
71.2.3.1 | Cuprorivaite | CaCuSi4O10 | Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc |
71.2.3.3 | Effenbergerite | BaCuSi4O10 | Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc |
71.2.3.4 | Chromphyllite | K(Cr,Al)2(AlSi3O10)(OH,F)2 | Mon. 2/m : B2/b |
Related Minerals - Hey's Chemical Index of Minerals Grouping
14.7.1 | Sanbornite | Ba2(Si4O10) | Orth. |
14.7.2 | Krauskopfite | BaSi2O5 · 3H2O | Mon. |
14.7.3 | Walstromite | BaCa2(Si3O9) | Tric. |
14.7.4 | Macdonaldite | BaCa4Si16O36(OH)2 · 10H2O | Orth. |
14.7.5 | Ericssonite | BaMn2+2Fe3+(Si2O7)O(OH) | Mon. 2/m : B2/m |
14.7.6 | Ericssonite-2O | BaMn2+2Fe3+(Si2O7)O(OH) | Orth. |
14.7.8 | Andrémeyerite | BaFe2+2(Si2O7) | Mon. |
14.7.9 | Pellyite | Ba2Ca(Fe,Mg)2Si6O17 | Orth. |
14.7.10 | Taikanite | Sr3BaMn2+2(Si4O12)O2 | Mon. |
14.7.11 | Willemite | Zn2SiO4 | Trig. 3 : R3 |
14.7.12 | Hemimorphite | Zn4Si2O7(OH)2 · H2O | Orth. mm2 : Imm2 |
14.7.13 | Zincsilite | Zn3(Si4O10)(OH)2 · 4H2O | Mon. |
14.7.14 | Hardystonite | Ca2Zn(Si2O7) | Tet. 4 2m : P4 21m |
14.7.15 | Petedunnite | Ca(Zn,Mn2+,Mg,Fe2+)Si2O6 | Mon. |
14.7.16 | Clinohedrite | CaZn(SiO4) · H2O | Mon. m : Bb |
14.7.17 | Junitoite | CaZn2Si2O7 · H2O | Orth. mm2 |
14.7.18 | Larsenite | PbZnSiO4 | Orth. mm2 : Pna21 |
14.7.19 | Esperite | PbCa2Zn3(SiO4)3 | Mon. 2/m : P21/b |
14.7.20 | Hodgkinsonite | Mn2+Zn2(SiO4)(OH)2 | Mon. |
14.7.21 | Gerstmannite | MnMgZn(SiO4)(OH)2 | Orth. |
14.7.22 | Gageite | Mn21(Si4O12)2O3(OH)20 | Mon. 2/m |
14.7.23 | Franklinfurnaceite | Ca2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8 | Mon. 2 : B2 |
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.
References for Gillespite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Schaller, W.T. (1922) Gillespite, a new mineral. Journal of the Washington Academy of Sciences: 12: 7-8.
Schaller, W.T. (1929) The properties and associated minerals of gillespite. American Mineralogist: 14: 319-322.
Pabst, Adolf (1942), The unit cell and space group of gillespite: Am. Min.: 28: 372-390; …(abstract): American Mineralogist: 26: 199 (1941).
Pabst, Adolf (1958), The structure of leached gillespite: American Mineralogist: 43: 970-980.
Hazen, R.M. & C.W. Burnham (1974), The crystal structure of gillespite I and II: a structure determination at high pressure: American Mineralogist: 59: 1166-1174.
Hazen, R.M. (1977), Mechanisms of transformation and twinning in gillespite at high pressure: American Mineralogist: 62: 528-533.
Internet Links for Gillespite
mindat.org URL:
https://www.mindat.org/min-1693.html
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Localities for Gillespite
Locality List




All localities listed without proper references should be considered as questionable.
Canada | |
| Canadian Mineralogist:11:444; Canadian Mineralogist22:653-658; Alfors, J.T. & Pabst, A. (1984): Titanian taramellites in western North America, American Mineralogist, 69, 358-373. |
Mexico | |
| |
No reference listed | |
| American Mineralogist, Volume 69, pages 358-373, 1984 |
USA (TL) | |
| J.Washington Acad.Sci.(1922) 12, 7-8; Amer. Mineral (1929) 14:319-322 |
| Anonymous (1963), Core drilling at Rush Creek completed: California Division Mines, Mineral Information Service: 16(1): 11; Stinson, Melvin Clarence & J.T. Alfors (1964), New minerals from Fresno County – I: California Division Mines & Geology Mineral Information Service.: 17: 235-238; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 359, 381. |
Mineralogical Record (2002): 33: 161.; Canadian Mineralogist (2001): 39:1053-1058.; Kampf, A.R., Rossman, G.R., Steele, I.M., Pluth, J.J., Dunning, G.E., Walstrom, R.E. (2010): Devitoite, a new heterophyllosilicate with astrophyllite-like layers from eastern Fresno County, California. The Canadian Mineralogist: 48: 29-40. | |
Bob Walstrom, p.c. | |
| Rogers, A.F. (1932) Sanbornite, a new barium silicate mineral from Maricopa County, California. American Mineralogist: 17: 171.; Murdoch, J. and Webb, R.W. (1966) Minerals of California, Centennial Volume (1866-1966). California Division Mines & Geology Bulletin 189: 359, 385.; American Mineralogist (1981) 66: 1050-1053.; Canadian Mineralogist (1984) 22: 653-658.; Dunning, G.E. and Cooper, J.F. (1999) Barium silicate minerals from Trumbull Peak, Mariposa County, California. Mineralogical Record: 30(6): 411-417.; Jambor, J.L. and Roberts, A.C. (2002) New mineral names. American Mineralogist: 87: 765-768. |
| Pabst, Adolf (1978) Zur morphologie des taramellits. Tschermaks Mineralogische und Petrographische Mitteilungen: 25: 248; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 464, 466. |
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El Rosario, Mun. de Ensenada, Baja California, Mexico