Hauyne

Real mineral · rare · (Na,Ca)₄-8Al₆Si₆(O,S)₂₄(SO₄,Cl)₁-2

A feldspathoid of alkaline volcanic rock, and one of the few minerals of a true cornflower blue. Crystals large enough to cut are almost confined to the Eifel lavas of Germany.

Identity

Formula

(Na,Ca)₄-8Al₆Si₆(O,S)₂₄(SO₄,Cl)₁-2

Chemical class

silicate

Mineral group

Lapis Lazuli, Sodalite

Also known as

Hauynite

Crystallography

Crystal system

cubic

Habits

dodecahedral, granular, massive

Fracture

conchoidal

Physical properties

Mohs hardness

5.5

Density

2.45 g/cm³

Luster

vitreous, waxy

Colors

blue, green, red, yellow, gray

Streak

bluish white

Transparency

transparent, translucent

Geology

Origins

volcanic

Host rocks

phonolite, basalt

Associated minerals

Nepheline, Sodalite, Cancrinite

Geography

Germany, Italy, Morocco

Classification

Rarity

rare

Gem quality

Yes

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