Anthophyllite

Formula : Mg7Si8O22(OH)2

Family: 
Space group: 
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Dana class: 
66.1.2.2 (66) Inosilicate Double-Width Unbranched Chains, W=2 (66.1) Dana Type (66.1.2) Group 1, the Mg-Fe-Mn-Li amphiboles (Orthorhombic)
High temperature: 
Anthophyllite is stable from 200C to about 700C.
Geological context: 
Occurs from medium- or high-grade metamorphism, in amphibolites, gneisses, metaquartzites, iron formations, granulites, and schists derived from argillaceous sediments, ultramafic, or mafic igneous rocks; also a retrograde reaction product.

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

T(°C) 0 25 60 100 150 200 250 300
log10K 82.84 73.78 62.89 52.87 43.05 35.23 28.64 22.62