Photo: Robert M. Lavinsky · CC BY-SA 3.0

Hydrous manganese oxide mineral

Properties

Chemical formula

(Na,Ca,K,Ba,Sr)₁-x(Mn,Mg,Al)₆O₁₂·3-4H₂O

Group

Oxides

Crystal system

Monoclinic

Hardness (Mohs)

—

Color

Brown

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

4.DK.10

Dana classification

—

IMA status

Approved mineral and/or valid name (A)

IMA symbol

Tdr

Locality

—

Type locality

—

Discovery year

—

Source: Wikidata