Staurolite

Formula : Fe2Al9Si4O23(OH)

Space group: 
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Dana class: 
52.2.3.1 (52) Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O (52.2) with cations in [4] and >[4] coordination (52.2.3) Dana Group
High temperature: 
Its stability ranges from 500 to 700C and depends on the chemistry of rocks, on pressure and on fugacity of the water.
Geological context: 
Common in pelitic schists, gneisses, and argillaceous rocks regionally metamorphosed to amphibolite grade.

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Reaction properties
T(°C) 0 25 60 100 150 200 250 300
log10K 247.44 216.34 180.10 146.64 113.13 85.81 62.48 41.59