Epidote in fluorapatite

Article Abstract:

Epidote is a calcium iron silicate hydroxide which is sometimes found as long, thin and greenish inclusions in fluorapatite. Epidote oftentimes occur in metamorphic rocks and shows a very distinct pleochroism. They are sharp, needlelike, striated and very conspicuous in fluorapatite.

Crystals, Rocks, Metamorphic, Metamorphic rocks, Inclusions, Epidote

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Chromite in williamsite

Article Abstract:

Chromite is an iron chromium oxide crystal typically black and opaque with an iridiscent tarnish. It may be found as an inclusion in williamsite, a variety of the serpentine group found at the Line Pit Chrome mine on the Maryland-Pennsylvania state border.

Analysis, Chromite, Serpentinite

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Copper in labradorite

Article Abstract:

Copper inclusions are characteristic of labradorites called Oregon sunstones These inclusions were probably a result of copper impurities being exsolved after being exposed to extremely high temperatures.

Composition, Plagioclase, Precious stones

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