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Mineralpedia Details for Gillespite

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Gillespite

Gillespite

Named after Frank Gillespie of Alaska, USA who discovered the first specimen. Gillespite is a rare mineral that occues in glacial moraines and from contact metamorphic zones in localities in Alaska and California in the USA, in Yukon Territory, Canada, and in Baja California, Mexico. Associated minerals include celsian, hedenbergite, quartz, sanbornite, diopside, tourmaline, pyrrhotite, pellyite, taramellite, fresnoite, muirite, and baryte.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/gillespite.pdf

Formula
BaFe2+Si4O10 
Crystal System
Tetragonal 
Crystal Habit
Aggregates 
Cleavage
Good, Good, Poor 
Luster
Vitreous (Glassy) 
Color
red 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Brittle 
Hardness
WebMineral
View Gillespite 
Mindat
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Gillespite from Gun Claims, MacMillian Pass, Itsy Mountains, Yukon Territory, Canada

Gillespite
            from Gun Claims, MacMillian Pass, Itsy Mountains, Yukon Territory, Canada

Deep red, large cleavages of crystals to over 3cm embedded in matrix.

Click thumbnail images for larger view.

Gillespite from Big Creek, Fresno Co., California, United States

Gillespite
            from Big Creek, Fresno Co., California, United States
Special Info
Phillips Collection

Deep red, platy cleavages to 3cm in Quartz matrix. 

Click thumbnail images for larger view.

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