The open encyclopedia of minerals

Glossary Cite the database

Mineralogist.org

Minerals A–Z Search Collections Browse by Property Identify a Specimen Compare Minerals Localities Map Glossary Contribute Search the Database →

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

Calvertite

Name

—

Cu₅Ge₀.₅S₄

Formula

—

Mineral Species

Entry type

—

Sulfides

Chemical class

—

Cubic

Crystal system

—

4–5

Mohs hardness

—

5.239

Specific gravity

—

Black

Streak

—

Metallic. Birefringence: None

Luster

—

None

Cleavage

—

—

Space group

—

—

Structural group

—

Cvt · Approved

IMA

—

2006

Named in

—

Black; pale bluish-gray in reflected light

Typical colors

—

Cu · Ge · S

Elements

—