Compare Minerals
Put any two minerals side by side — formula, structure, hardness, density and more. Type to search each slot.
Name
—
2[(Fe,Cu)S]·1.53[(Fe,Al,Mg)(OH)₂]
Formula
—
Mineral Species
Entry type
—
Oxides & Hydroxides
Chemical class
—
Hexagonal
Crystal system
—
1
Mohs hardness
—
3.72
Specific gravity
—
Black
Streak
—
Metallic (fresh), dull, or tarnishes to iridescent golden-brown
Luster
—
Perfect on {001}
Cleavage
—
R-3m
Space group
—
Valleriite
Structural group
—
Fval · Approved
IMA
—
1970
Named in
—
Dark bronze (fresh), to nearly black
Typical colors
—
Fe · Cu · S · Al · Mg · O · H
Elements
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