VS
Name
—
Ca₄Mn²⁺₃Si₈O₂₀(OH)₆·2H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Hexagonal
Crystal system
—
4–5
Mohs hardness
—
2.7–2.8
Specific gravity
—
Light brown
Streak
—
Vitreous
Luster
—
{0001}, perfect
Cleavage
—
—
Space group
—
Gyrolite
Structural group
—
Orl · Approved
IMA
—
1988
Named in
—
Dark brown; in transmitted light, light to dark brown
Typical colors
—
Ca · Mn · Si · O · H
Elements
—