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

Obsidian

Name

—

SiO₂-rich volcanic glass

Formula

—

Mineraloid

Entry type

—

Silicates

Chemical class

—

Amorphous

Crystal system

—

5–5.5

Mohs hardness

—

2.33–2.42

Specific gravity

—

White

Streak

—

Vitreous

Luster

—

None — glass

Cleavage

—

—

Space group

—

—

Structural group

—

—

IMA

—

—

Named in

—

Black, Brown, Gray, Red

Typical colors

—

—

Elements

—