Formula: Ca2Mn2+Fe3+Si4O12(OH).2H2O
Sorosilicate (Si2O7 groups), manganese-bearing mineral
Crystal System: Triclinic
Specific gravity: 3.02 measured, 3.01 calculated
Hardness: 5½
Streak: Light orange-brown
Colour: Dark brown to light brown in thinner crystals
Environments
Localities
At the type locality, the Fengjiashan mine, Daye county, Huangshi, Hubei, China, hubeite occurs in
manganiferous skarn in three
different associations.
Firstly, as aggregates to 5 mm of crystals to 1 mm of hubeite on euhedral crystals of
quartz.
Also on flat, thin specimens covered on both sides with crystals of hubeite and its associates; one side is
predominantly hubeite with minor inesite and
apophyllite, and the other side has either approximately equal amounts of
hubeite, inesite and
apophyllite or predominant inesite
with only minor hubeite and apophyllite.
In the third association massive to radiating inesite is partly covered by
apophyllite and associated with
ilvaite.
It is inferred that the hubeite was formed in mildly oxidising conditions, with available Fe
(Minrec 33.6.465-471).
Hubeite from Fengjiashan - Image
Back to Minerals