Formula : Fe3Si4O10(OH)2

Space group: 
Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: C1
Dana class: (71) Phyllosilicate Sheets of Six-Membered Rings (71.2) with 2:1 Layers (71.2.1) Pyrophyllite-talc group
High temperature: 
Minnesotaite would be stable over a wide range of pressure temperature conditions, ranging from a minimum of that determined for talc (90C or less) to maximal conditions of those associated with the transition from the biotite to garnet zones, as shown b
Geological context: 
banded iron formations of northern Minnesota in association with quartz, siderite, stilpnomelane, greenalite and magnetite. In addition to the low grade metamorphic banded iron formations it has also been reported as an alteration mineral associated with sulfide bearing veins.

Dernière mise à jour le 25.01.2021


Reaction properties
T(°C) 0 25 60 100 150 200 250 300
log10K 17.02 14.94 12.28 9.77 7.27 5.25 3.47 1.74