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

S

Name

—

KFe²⁺₂Al(Si₂Al₂)O₁₀(OH)₂

Formula

—

Mineral Species

Entry type

—

Silicates

Chemical class

—

Monoclinic

Crystal system

—

2.5–3

Mohs hardness

—

3.1

Specific gravity

—

—

Streak

—

—

Luster

—

{001}, perfect

Cleavage

—

C2

Space group

—

Mica

Structural group

—

Sid · Approved

IMA

—

1881

Named in

—

Black, dark brown, dark green

Typical colors

—

K · Fe · Al · Si · O · H

Elements

—