Garnet is found in metamorphic rocks and pegmatites as cubic crystals, rounded grains and granular masses. It is brittle, glassy, and occurs in many hues; some varieties (particularly the red form) are important as gemstones. Being hard it is also used as an abrasive. Hardness 6.5–7.5, relative density 4. It is popularly the birthstone for January.
Related category• GEOLOGY AND PLANETARY SCIENCE
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