VS
Name
—
Ca₂Fe²⁺Fe³⁺₂(Si₂O₇)(SiO₄)(OH)₂·H₂O
Formula
—
Mineral Species
Entry type
—
Silicates
Chemical class
—
Monoclinic
Crystal system
—
4.5
Mohs hardness
—
3.58–3.6
Specific gravity
—
Greenish olive with a bluish tinge
Streak
—
Nearly submetallic
Luster
—
Perfect on {100} and {001}
Cleavage
—
A2/m
Space group
—
Pumpellyite
Structural group
—
Jul-Fe2+ · Approved
IMA
—
1966
Named in
—
Deep black, greenish black to green in small fragments; in thin section
Typical colors
—
Ca · Fe · Si · O · H
Elements
—