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... ing to the variety and impurities, and most of them are dark.
The lightness also varies slightly with the variety, which is the main indicator to distinguish the variety.
The pyroxene group minerals are one of the important rock-forming minerals, which are concentrated in ultrabasic, basic, mesobasic and alkaline igneous rocks, and are also found in some deep metamorphic rocks.
Diopside, calcite, etc. are important alteration-causing minerals.
Among the many pyroxene ...
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