mineral

Chalcedony with Druzy Quartz

Silicon Dioxide (SiO2)

Hardness: 6.5-7 Mohs; Color: White, tan, light brown; Luster: Waxy to vitreous; Crystal structure: Hexagonal (trigonal); Specific gravity: 2.6-2.64

Hardness: 6
Color: White, tan, light brown
Luster: Waxy to vitreous

Identified July 12, 2026More mineral →

Explore Chalcedony with Druzy Quartz in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5-7 Mohs; Color: White, tan, light brown; Luster: Waxy to vitreous; Crystal structure: Hexagonal (trigonal); Specific gravity: 2.6-2.64

Formation & geological history

Formed from silica-rich groundwater precipitating in cavities or fractures of volcanic or sedimentary rocks. This specimen shows a microcrystalline base with small surface crystal growth.

Uses & applications

Commonly used in jewelry (as a gemstone), lapidary art, and as a collectible specimen for geological enthusiasts.

Geological facts

The word 'chalcedony' is derived from the name of the ancient Greek town Chalcedon in Asia Minor. It is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite.

Field identification & locations

Identify in the field by its waxy luster, lack of cleavage, and ability to scratch glass. Commonly found in desert environments, riverbeds, and volcanic regions.