Varennesite

General Information:
 Chemical Formula:
Na8Mn++2Si10O25(OH,Cl)2·12(H2O)
 Environment:
As a primary, late-stage mineral in a sill.
 IMA Status:
Approved IMA
 Locality:
Demix-Varennes quarry, which lies between the villages of Varennes and Saint-Amable, in Vercheres County, Quebec
 Name Origin:
For the locality.
Physical Properties:
 Cleavage:
[010] Good
 Color:
pale brownish yellow or orange.
 Density:
2.31
 Diaphaniety:
Translucent to transparent
 Habits:
Tabular - Form dimensions are thin in one direction., Euhedral Crystals - Occurs as well-formed crystals showing good external form.,
 Hardness:
4 - Fluorite
 Luminescence:
Non-fluorescent.
 Luster:
Vitreous (Glassy)
 Streak:
white
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