Compare Minerals

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

Mineral A

Mineral B

Pertlikite

Name

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K₂(Fe²⁺,Mg)₂(Mg,Fe³⁺)₄Fe³⁺₂Al(SO₄)₁₂·18H₂O

Formula

—

Mineral Species

Entry type

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Sulfates

Chemical class

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Tetragonal

Crystal system

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Mohs hardness

—

2.59

Specific gravity

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Grayish green

Streak

—

Luster

—

None

Cleavage

—

I4_1/acd

Space group

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Voltaite

Structural group

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Plk · Approved

IMA

—

2005

Named in

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Dark olive-green to black

Typical colors

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K · Fe · Mg · Al · S · O · H

Elements

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