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muscovite An important rock-forming mineral and member of the mica group with composition K 2 Al 4 [Si 3 AlO 10] 2 (OH,F) 4 (see MICAS); when K is replaced by Na the mineral is called paragonite and is related to the phyllosilicates (sheet silicates) lepidolite and zinnwaldite (both lithium-bearing micas); sp. gr. 2.8–2.9; hardness 2.5–3.0 ...



Fuchsite. Modified date: 05/03/2024. Fuchsite, also known as chrome mica or green muscovite, is a variety of muscovite, which is a common form of mica. It gets its green color from the presence of chromium impurities. Fuchsite is often prized for its sparkling, shimmering appearance due to its fine crystal structure.








