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Mineralpedia Details for Amesite

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Amesite

Amesite

Named to honor mine owner James Ames. Amesite is a rare mineral that is the result of the low-grade metamorphism of aluminum and magnesium rich rocks. It can be found in localities in the United States, Canada, Antarctica, South Africa, Russia, Sweden, and Poland, among several others. Assocaited minerals include vesuvianite, chlorite, magnetite, rutile, diaspore, grossular, calcite, diopside, and clinozoisite.

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

Formula
Mg2Al(SiAl)O5(OH)4 
Crystal System
Triclinic 
Crystal Habit
Micaceous, Foliated, Pseudo Hexagonal 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
white, light green 
Streak
pale green 
Class
Triclinic - Pedial 
Hardness
2.5-3 
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Amesite (chromian) from Saranovskii mine, Urals Region, Russia

Amesite (chromian)
            from Saranovskii mine, Urals Region, Russia

It is a phyllosilicate and a member of the serpentine group. In this case it is colored purple by chromium, which is non-essential to the chemical composition. The crystals are pseudo-hexagonal and somewhat tapering like a tornado. The fun thing about this occurence is that the Amesite is color-changing. In sun-light it is a dull grey, but in incandescent lighting it is a beautiful purple.

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