VS
Name
—
Ca₂Fe²⁺Fe³⁺Si₅O₁₄(OH)
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Triclinic
Crystal system
—
5.5–6
Mohs hardness
—
3.34–3.37
Specific gravity
—
—
Streak
—
Vitreous
Luster
—
Perfect on {001}, good on {010} and {100}
Cleavage
—
P-1
Space group
—
Rhodonite
Structural group
—
Bab · Grandfathered
IMA
—
1824
Named in
—
Dark greenish black
Typical colors
—
Ca · Fe · Si · O · H
Elements
—