Mining Terms Glossary

Welcome to the Mineral and precious stone glossary



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J

Japanese twin

Form of contact twinning where two single Quartz crystals are joined by the their base at an angle near 90°.


Jet

Coal that can be polished and used for ornamental purposes.


Jewel

A gem, whether cut or uncut, capable of being used as an ornament.


Jeweler

Individual whose trade is to buy and sell jewels and gemstones.


Jewelry

Jewels worn as ornaments.