There are three axes, each of different lengths. Two are at right angles to each other and the third is inclined. Based on a parallelogram inner structure.
Crystal shapes include:
- Basal pinacoids and prisms with inclined end faces
Common Monoclinic Crystals:
- Azurite, Chrysocolla, Diopside
- Epidote, Gypsum, Hiddenite
- Howlite, Kunzite, Lazulite
- Moonstone, Muscovite (Mica), Petalite
- Serpentine, Spodumene, Staurolite
- Vivianite
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