VS
Name
—
CaFe³⁺Fe²⁺₂O(Si₂O₇)(OH)
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
5.5–6
Mohs hardness
—
3.99–4.05
Specific gravity
—
Black, inclining to green or brown
Streak
—
Submetallic
Luster
—
Distinct on {001} and {010}
Cleavage
—
Pnam
Space group
—
Ilvaite
Structural group
—
Ilv · Grandfathered
IMA
—
1811
Named in
—
Black, Brown
Typical colors
—
Ca · Fe · O · Si · H
Elements
—