Photo: Auckland Museum Collections from Auckland, Aotearoa New Zealand · CC BY 2.0

Mineral, calcium iron carbonate

Properties

Chemical formula

Ca(Fe²⁺,Mg)(CO₃)₂

Group

Carbonates

Crystal system

Trigonal

Hardness (Mohs)

—

Color

Brown

Luster

—

Streak

White

Density

3 g/cm³

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

5.AB.10

Dana classification

14.2.1.2

IMA status

Grandfathered mineral (G)

IMA symbol

Ank

Locality

—

Type locality

—

Discovery year

—

Source: Wikidata