Chalcedony on quartz with malachite
From the collection · View photograph

Stones underfoot / Collection

Chalcedony on quartz with malachite

Russia, Altai

Chemical formulaSiO₂

Mohs hardness
6,5–8
Dimensions
62×45 mm

Properties

Specimen properties and description

Colour
Grey
Density
2,58—2,64 g/cm³
Lustre
Vitreous
Transparency
Opaque
Cleavage
None
Crystal system
Trigonal

Crystal structure

Trigonal crystal system

Crystal symmetry diagram.

Trigonal crystal system
Chalcedony on quartz with malachite