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Crystal System:
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.
This page provides mineralogical data about Gillespite.

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Classification of GillespiteHide

Approved, 'Grandfathered' (first described prior to 1959)

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers

14 : Silicates not Containing Aluminum
7 : Silicates of Ba, Sr and Zn

Pronounciation of GillespiteHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of GillespiteHide


Optical Data of GillespiteHide

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.
Surface Relief:

Chemical Properties of GillespiteHide

Common Impurities:

Crystallography of GillespiteHide

Crystal System:
Cell Parameters:
a = 7.49 Å, c = 16.05 Å
a:c = 1 : 2.143
Unit Cell V:
900.41 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of GillespiteHide

Other Language Names for GillespiteHide

Relationship of Gillespite to other SpeciesHide

Other Members of this group:
CuprorivaiteCaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
EffenbergeriteBaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc

Common AssociatesHide

Associated Minerals Based on Photo Data:
Sanbornite43 photos of Gillespite associated with Sanbornite on
Celsian5 photos of Gillespite associated with Celsian on
Pellyite4 photos of Gillespite associated with Pellyite on
Taramellite3 photos of Gillespite associated with Taramellite on
Titantaramellite3 photos of Gillespite associated with Titantaramellite on
Quartz3 photos of Gillespite associated with Quartz on
Alforsite2 photos of Gillespite associated with Alforsite on
Sulphur2 photos of Gillespite associated with Sulphur on
Anandite1 photo of Gillespite associated with Anandite on

Related Minerals - Nickel-Strunz GroupingHide

9.EA.05CuprorivaiteCaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05EffenbergeriteBaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.10EkaniteCa2ThSi8O20Tet. 4 2 2 : I4 2 2
9.EA.15Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mnc
9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2OTet.
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2OOrth.
9.EA.20MagadiiteNa2Si14O29 · 11H2OMon.
9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2OOrth. mm2 : Pmm2
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2OMon.
9.EA.40OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
9.EA.45NekoiteCa3Si6O15·7H2OTric. 1 : P1
9.EA.50CavansiteCa(VO)Si4O10 · 4H2OOrth. mmm (2/m 2/m 2/m)
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2OOrth. mm2
9.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2OMon.
9.EA.65NabesiteNa2BeSi4O10 · 4H2OOrth. 2 2 2 : P21 21 21
9.EA.70Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2OTric.
9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2OMon. 2/m : B2/b
9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4Mon. 2/m : B2/b
9.EA.85PlumbophyllitePb2Si4O10 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn

Related Minerals - Dana Grouping (8th Ed.)Hide 4/mmm (4/m 2/m 2/m) : P4/ncc 4/mmm (4/m 2/m 2/m) : P4/ncc,Al)2(AlSi3O10)(OH,F)2Mon. 2/m : B2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.7.2KrauskopfiteBaSi2O5 · 3H2OMon.
14.7.4MacdonalditeBaCa4Si16O36(OH)2 · 10H2OOrth.
14.7.5EricssoniteBaMn2+2Fe3+(Si2O7)O(OH)Mon. 2/m : B2/m
14.7.11WillemiteZn2SiO4Trig. 3 : R3
14.7.12HemimorphiteZn4Si2O7(OH)2 · H2OOrth. mm2 : Imm2
14.7.13ZincsiliteZn3(Si4O10)(OH)2 · 4H2OMon.
14.7.14HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
14.7.16ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
14.7.17JunitoiteCaZn2Si2O7 · H2OOrth. mm2
14.7.18LarsenitePbZnSiO4Orth. mm2 : Pna21
14.7.19EsperitePbCa2Zn3(SiO4)3Mon. 2/m : P21/b
14.7.22GageiteMn21(Si4O12)2O3(OH)20Mon. 2/m
14.7.23FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8Mon. 2 : B2

Other InformationHide

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 GillespiteHide

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 GillespiteHide

Localities for GillespiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Yukon
    • Watson Lake Mining District
      • Itsi Mt.
        • Wilson Lake
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.
  • Baja California (Baja California Norte; BC Norte)
    • Mun. de Ensenada
No reference listed
    • Tres Pozos
American Mineralogist, Volume 69, pages 358-373, 1984
  • Alaska
    • Yukon-Koyukuk Borough
      • Alaska Range
J.Washington Acad.Sci.(1922) 12, 7-8; Amer. Mineral (1929) 14:319-322
  • California
    • Fresno Co.
      • Big Creek-Rush Creek District
        • Rush Creek deposit
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.
    • Mariposa Co.
      • East Belt
        • Clearing House District
          • Clearing House
            • Trumbull Peak
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.
    • Tulare Co.
      • Dumtah
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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