Minerals & Gemstone 480x104
Minerals & Gemstone 480x104
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Glossary of Terms
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Spinel twin
Form of contact twinning, in which two octahedral crystals twin at the base. Named after the mineral Spinel, which often exhibits this form of twinning.
3D Animated Illustration of a Spinel Twin
Crystals kindly provided by Smorf

 




Classic Spinel-law Twin



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