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Mineralpedia Details for Magnesiohastingsite

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Magnesiohastingsite

Magnesiohastingsite

Named for the magnesium content in the composition and for its relationship to hastingsite. Magnesiohastingsite is an uncommon mineral that is found in alkaline basalts, in andesites, latites, tephrites, and tuffs, and in carbonatites. Localities include Austria, the Czech Republic, Germany, Sweden, Russia, Greenland, Canada, the United States, and Zimbabwe.

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

Formula
NaCa2(Mg4Fe3+)Si6Al2O22(OH)2 
Crystal System
Monoclinic 
Cleavage
Good, Perfect, None 
Luster
Vitreous (Glassy) 
Color
green 
Class
Monoclinic - Prismatic 
Hardness
5-6 
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Magnesiohastingsite from Långban, Filipstad, Värmland, Sweden

Magnesiohastingsite
            from Långban, Filipstad, Värmland, Sweden

Reddish brown bladed crystals to 2cm composing the entire matrix. 

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