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Antigorite
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Antigorite is a lamellated, monoclinic mineral in the phyllosilicate serpentine subgroup with the ideal chemical formula of 3Si2O54. It is the high-pressure polymorph of serpentine and is commonly fou
Antigorite crystals in serpentinite from Poland
Antigorite crystals in serpentinite from Poland
Polished antigorite
Polished antigorite
Simplified crystal structure of antigorite looking down the b axis. Blue triangles indicate SiO4 tetrahedra, green layers indicate Mg octahedra. Red l
Simplified crystal structure of antigorite looking down the b axis. Blue triangles indicate SiO4 tetrahedra, green layers indicate Mg octahedra. Red line indicates polarity reversal. In this case, m = 17.
Serpentinite
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Serpentinite is a metamorphic rock composed predominantly of serpentine group minerals formed by serpentinization of mafic or ultramafic rocks. The ancient origin of the name is uncertain; it may be f
Antigorite
…subgroup with the ideal chemical formula of (Mg,Fe2+)3Si2O5(OH)4. It is the high-pressure polymorph of serpentine and is commonly found in metamorphosed serpentinites. Antigorite, and its serpentine polymorphs, play an important role in subduction zone dynamics due to their relative weakness and high weight percent…
Serpentinite from the Maurienne valley, Savoie, French Alps
Serpentinite from the Maurienne valley, Savoie, French Alps
Sample of serpentinite from the Golden Gate National Recreation Area, California, United States
Sample of serpentinite from the Golden Gate National Recreation Area, California, United States
Chromitic serpentinite (7.9 cm (3.1 in) across), Styria Province, Austria. Protolith was a Proterozoic-Early Paleozoic upper mantle dunite peridotite
Chromitic serpentinite (7.9 cm (3.1 in) across), Styria Province, Austria. Protolith was a Proterozoic-Early Paleozoic upper mantle dunite peridotite that has been multiply metamorphosed during the Devonian, Permian, and Mesozoic.
Tightly folded serpentinite from the Tux Alps, Austria. Closeup view about 30 cm × 20 cm (12 in × 8 in).
Tightly folded serpentinite from the Tux Alps, Austria. Closeup view about 30 cm × 20 cm (12 in × 8 in).