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Serpentine group minerals have a Mohs hardness of 2.5 to 3.5, so serpentinite is easily carved. [26] Grades of serpentinite higher in calcite , along with the verd antique ( breccia form of serpentinite), have historically been used as decorative stones for their marble-like qualities.
Serpentine subgroup (part of the kaolinite-serpentine group in the category of phyllosilicates) [1] are greenish, brownish, or spotted minerals commonly found in serpentinite. They are used as a source of magnesium and asbestos , and as decorative stone. [ 5 ]
Lizardite is a mineral from the serpentine subgroup [3] with formula Mg 3 (Si 2 O 5)(OH) 4, and the most common type of mineral in the subgroup. [4] It is also a member of the kaolinite-serpentine group. [5] Lizardite may form a solid-solution series with the nickel-bearing népouite (pure end-member: Ni 3 (Si 2 O 5)(OH) 4).
Serpentine soil is an uncommon soil type produced by weathered ultramafic rock such as peridotite and its metamorphic derivatives such as serpentinite.
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Benitoite typically occurs with an unusual set of minerals, along with minerals that make up its host rock. Frequently associated minerals include: natrolite, neptunite, joaquinite, serpentine and albite. Benitoite is a rare mineral found in very few locations including San Benito County, California, Japan and Arkansas.
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