Compare Minerals
Put any two minerals side by side — formula, structure, hardness, density and more. Type to search each slot.
Name
—
Ca₀.₅Fe²⁺Fe³⁺₅(PO₄)₄(OH)₆·2H₂O
Formula
—
Mineral Species
Entry type
—
Phosphates
Chemical class
—
Monoclinic
Crystal system
—
3.5–4.5
Mohs hardness
—
3.1–3.34
Specific gravity
—
—
Streak
—
Vitreous to silky
Luster
—
One, perfect; another, less perfect, both k fiber elongation; a third ⊥ first two, in traces
Cleavage
—
C2/c
Space group
—
Dufrénite
Structural group
—
Dfr · Grandfathered
IMA
—
1833
Named in
—
Greenish black, dark green, olive-green when fresh, olive-brown to reddish brown when oxidized
Typical colors
—
Ca · Fe · P · O · H
Elements
—