Mineral Gallery - THE TWINNED MINERALS - Amethyst GalleriesTwinned minerals have their own following in the mineral collecting hobby. There are collectors that are only interested in twinned minerals. Twins can add a fascinating side to otherwise boring minerals or can add yet another dimension to an already complex mineral such as calcite. There are several minerals that form.twinning of minerals,Twinning - Minerals Glossary of TermsTwinning glossary term at minerals educational reference guide.Penetration Twinning - Minerals Glossary of TermsPenetration Twinning glossary term at minerals educational reference guide.
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