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Compare Minerals

Put any two minerals side by side — formula, structure, hardness, density and more. Type to search each slot.

Mineral A

VS

Mineral B

Erdite

Name

—

NaFeS₂·2H₂O

Formula

—

Mineral Species

Entry type

—

Oxides & Hydroxides

Chemical class

—

Monoclinic

Crystal system

—

—

Mohs hardness

—

2.2

Specific gravity

—

Black

Streak

—

—

Luster

—

Good on {110}

Cleavage

—

C2/c

Space group

—

—

Structural group

—

Erd · Approved

IMA

—

1977

Named in

—

Copper-red to bronze on fresh surface, may be chatoyant, tarnishes rapidly

Typical colors

—

Na · Fe · S · H · O

Elements

—