Chlorite

Chlorite is a relatively common green mineral – a member of the Mica group. It is often found as foliated sheets, surface growths, or as an inclusion in other materials.

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Appearance, Uses and History

Chlorite is actually a group of minerals – however, it can be extremely difficult to differentiate between them and the specific chlorite minerals are little known. The most common are clinochlore and chamosite.

Locales

Mineralogy

Chemistry
Colours and Variations
Usually green to dark green, almost black.
Streak
Very pale green to grey.
Luster
Vitreous, dull
Fracture
Transparency
Crystal habit
Mohs hardness
2 – 2.5
Specific Gravity
2.6 – 3.3
Fluorescence
N/A
Easiest testing method
Common Treatments
None.

Photos of Chlorite

Hazards and Warnings

Almost all rocks, minerals (and, frankly, almost all other substances on earth) can produce toxic dust when cutting, which can cause serious respiratory conditions including silicosis.

When cutting or polishing rocks, minerals, shells, etc, all work should be done wet to minimise the dust, and a suitable respirator or extraction system should be used.

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Further Reading / External Links