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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

Cummingtonite

Name

—

Mg₂Mg₅Si₈O₂₂(OH)₂

Formula

—

Mineral Species

Entry type

—

Silicates

Chemical class

—

Monoclinic

Crystal system

—

5–6

Mohs hardness

—

3.1–3.6

Specific gravity

—

white

Streak

—

Vitreous

Luster

—

Good on {110}, intersecting at 54± and 126±

Cleavage

—

C2/m

Space group

—

Amphibole

Structural group

—

Cum · Approved

IMA

—

1824

Named in

—

Brown, Gray

Typical colors

—

Mg · Si · O · H

Elements

—