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Mineralpedia Details for Diopside

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Diopside

Diopside

Named for the Greek dyo, from which the prefix di- gets its origin to represent “two,” and opsi, meaning “face,” in reference to the two possible orientations of the vertical prism. Diopside is a relatively common mineral that can be found of fine quality in localities in Austria, Italy, Finland, Russia, Canada, the United States, Madagascar, China, Afghanistan, India, and Pakistan, among many other general localities. It occurs commonly in skarn, calcium and magnesium rich gneiss and schist, kimberlites, and peridotites and is typical of metamorphosed silicious calcium and magnesium rich rocks in the pyroxene-hornfels and epidote-amphibolite facies. Less commonly, Diopside can be found in alkaline olivine basalt and andesite.

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

Formula
CaMgSi2O6 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Blocky, Granular 
Cleavage
Good, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
blue, brown, colorless, green, gray 
Streak
white green 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
WebMineral
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Mindat
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Diopside from Azrat Syed, Kokcha Valley, Badakhshan, Afghanistan

Diopside
            from Azrat Syed, Kokcha Valley, Badakhshan, Afghanistan

A single, deep green, translucent, terminated crystal to 1.3cm with the typical vitreous luster in which a lot of Dioside seems to have.

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Diopside from Outokumpu, Finland

Diopside
            from Outokumpu, Finland

Deep, rich green prismatic chromian Diopside crystals to 2cm, terminated on the front side and longer crystals showing on the back side. Excellent showy specimen.

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Diopside from Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States

Diopside
            from Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States

Once called zinc Schefferite, later redescribed and found to be just a variety of Diopside with a platy reddish color and habit. Also Rhodonite and Andradite in this matreix.

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Diopside from Betroka dist., Anosy, Tuléar prov., Madagascar

Diopside
            from Betroka dist., Anosy, Tuléar prov., Madagascar

An excellent well-formed crystal showing good green color. Ex. Karl & Anne Vossbrinck collection (see prov. tab).

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