VS
Name
—
Ca₄Mn³⁺₃(BO₃)₃(CO₃)O₃
Formula
—
Mineral Species
Entry type
—
Borates
Chemical class
—
Hexagonal
Crystal system
—
6
Mohs hardness
—
3.35–3.5
Specific gravity
—
—
Streak
—
Vitreous to dull
Luster
—
—
Cleavage
—
P6_3/m
Space group
—
—
Structural group
—
Gfy · Approved
IMA
—
1964
Named in
—
Black; in reflected light, gray with strong yellow-orange to reddish internal reflections
Typical colors
—
Ca · Mn · B · O · C
Elements
—