Compare Minerals

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

Mineral A

Mineral B

Name

—

(Na,K, )(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH,F)₄

Formula

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Mineral Species

Entry type

—

Silicates

Chemical class

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Monoclinic

Crystal system

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Mohs hardness

—

2.89

Specific gravity

—

Streak

—

Luster

—

{001}, perfect

Cleavage

—

C-1

Space group

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Mica, Clay

Structural group

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Wns · Approved

IMA

—

1979

Named in

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Pale to dark brown; in thin section, light to dark brown

Typical colors

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Na · K · Mg · Fe · Al · Si · O · H · F

Elements

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