Some important gems in the monoclinic system are Feldspar (which includes orthoclase, I.e. moonstone, and labradorite), Jadeite and Nephrite.
As Jadeite and Nephrite are polycrystalline materials, we are not able to see the single crystals without high magnification. However in this video, you can see the white mineral embedded in the matrix. That white material is felspar and the monoclinic Crystal habit can be clearly seen. In this case, they are twin crystals where the crystals changed in its direction of growth during formation.
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Негізгі бет Monoclinic Crystal System - Feldspar
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