Mineralpedia Details for 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 

WebMineral

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Mindat

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