Download Inroduction - Geological Sciences, CMU

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Origin and Occurrences of Gemstones
Igneous Origin e.g.
- diamond - bearing kimberlites / lamproites
- corundum-bearing basalts
Metamorphic Origin e.g.
- garnet-bearing mica schists
- jadeite and nephrite
Hydrothermal Origin e.g.
- emerald-bearing calcite veins of Colombia
Pegmatitic Origin e.g.
- gem-bearing pegmatites of Brazil
Etc.
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