Photo: Gianfranco Ciccolini · Public domain

Rare mineral, calcium aluminum silicate hydrate

Properties

Chemical formula

Ca₁₂Al₂Si₁₈O₃₃(OH)₃₆

Group

Silicates

Crystal system

Monoclinic

Hardness (Mohs)

—

Color

—

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

9.HA.75

Dana classification

72.3.2.6

IMA status

Grandfathered mineral (G)

IMA symbol

Tch

Locality

🇬🇧 Portree

Type locality

—

Discovery year

—

Source: Wikidata