General Information:
Chemical Formula:
Ba4(Fe+++,Ti,Fe++,Mg,V+++)4(B2Si8O27)O2Clx x=0 to 1
Environment:
A contact-metamorphic mineral.
Locality:
Candoglia, in the Toce Valley, Piedmont, Italy
Name Origin:
Named for Torquato Taramelli (1845-1922), Italian geologist.
Physical Properties:
Cleavage:
[010] Perfect
Color:
reddish brown, bronze purple, or brownish violet.
Density:
3.9 - 3.92, Average = 3.91
Diaphaniety:
Translucent to subtranslucent
Habits:
Fibrous - Crystals made up of fibers., ,
Hardness:
5.5 - Knife Blade
Luster:
Vitreous - Resinous
Streak:
brown
More details...