Vermiculite(K)

Formula : K0.86Mg3.00Si3.14Al0.86O10(OH)2

Space group: 
Monoclinic - Prismatic HM symbol (2/m) Space Group: C 2/m
Dana class: 
71.3.1b.2VIII- 71 Phyllosilicate Minerals ; 71.3 Phyllosilicates Phyllosilicate Sheets of Six-Membered Rings with 2:1 clays ; 71.3.1b Smectite group (Trioctahedral Smectites)
High temperature: 
Low temperature mineral. At higher temperatures(> 500C), detachment of (OH) ions takes place.
Geological context: 
An alteration product of biotite or phlogopite, by weathering or hydrothermal action. Formed at the contact between felsic and ma_c or ultrama_c rocks such as pyroxenites and dunites; in carbonatites and metamorphosed limestones; a clayey constituent of soils.

Dernière mise à jour le 25.01.2021

THERMODYNAMICS

Individual properties (298.15 K)
T(°C) 0 25 60 100 150 200 250 300
log10K 42.60 37.46 31.36 25.79 20.34 16.00 12.33 8.97