Photo: Wikimedia Commons

Rare chromium-rich ettringite, or Cr-AFt

Properties

Chemical formula

Ca₆Cr₂(SO₄)₃(OH)₁₂·26H₂O

Group

Oxides

Crystal system

Hexagonal

Hardness (Mohs)

2

Color

Purple

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

7.DG.15

Dana classification

31.10.2.2

IMA status

Approved mineral and/or valid name (A)

IMA symbol

Bto

Locality

🇮🇱 Hatrurim Basin

Type locality

—

Discovery year

—

Source: Wikidata