Compare Minerals

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

Mineral A

Mineral B

Putnisite

Name

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SrCa₄Cr³⁺₈(CO₃)₈(SO₄)(OH)₁₆·25H₂O

Formula

—

Mineral Species

Entry type

—

Sulfates

Chemical class

—

Orthorhombic

Crystal system

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1.5–2

Mohs hardness

—

2.2

Specific gravity

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Pink

Streak

—

Vitreous

Luster

—

One excellent and two good parallel to {100}, {010}, and {001}

Cleavage

—

Pnma

Space group

—

Structural group

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Pni · Approved

IMA

—

2011

Named in

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Pale to dark purple

Typical colors

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Sr · Ca · Cr · C · O · S · H

Elements

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