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Mineralpedia Details for Gobbinsite

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Gobbinsite

Gobbinsite

Named for the type locality at Hills Port in Gobbins on Island Magee in Northern Ireland. Gobbinsite is a rare mineral that occurs as a secondary mineral in basalts, and in cavities in sodalite syenite. Localities for Gobbinsite include, additionally, in Canada, as well as newer localities in the United States, Russia, New Zealand, Japan, and Hungary.

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

Formula
Na5(Si11Al5)O32ยท11H2
Crystal System
Orthorhombic 
Crystal Habit
Aggregates, Lath 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
lemon white, chalky white, light brown 
Streak
white 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle 
Hardness
WebMineral
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Mindat
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Gobbinsite from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Gobbinsite
            from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Clear striated crystals to 1mm.

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