VS
Name
—
(Mn²⁺₀.₅Fe³⁺₀.₅)₂Fe³⁺₃(PO₄)₃(OH)₅
Formula
—
Mineral Species
Entry type
—
Phosphates
Chemical class
—
Orthorhombic
Crystal system
—
4.5
Mohs hardness
—
3.453
Specific gravity
—
—
Streak
—
Vitreous to dull
Luster
—
{100}, excellent; {010}, good; {001}, fair
Cleavage
—
Cmcm
Space group
—
Rockbridgeite
Structural group
—
Fnd · Grandfathered
IMA
—
1949
Named in
—
Dark brown, ocher-yellow, red-brown, orange, greenish brown; commonly zoned lengthwise
Typical colors
—
Mn · Fe · P · O · H
Elements
—