Greenish single specimen of magnesiocarpholite from the TL in France (Vanoise, Savoie, Auvergne-Rhône-Alpes, France). Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Magnesiocarpholite
The magnesium member of the carpholite group — silky acicular crystals in high-pressure metamorphic rocks.
Intro adapted from Wikipedia (CC BY-SA).
Magnesiocarpholite is an IMA-recognized mineral species in the silicate class, with the chemical formula MgAl₂Si₂O₆(OH)₄.
It crystallizes in the orthorhombic crystal system (space group Ccca). It is a member of the Carpholite structural group.
IMA symbol Mcar, IMA status: approved, named in 1973.
Found in veins and in schist, quartzite, and metabauxite developed during high-pressure, low-temperature metamorphism (Vanoise, France).
It is found associated with Chloritoid, pyrophyllite, paragonite, muscovite, diaspore, chlorite, hematite, quartz.
As the magnesium analog of carpholite.