mineral

White Agate (Chalcedony)

Chalcedony (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Milky white, translucent to opaque gray; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.64

Hardness: 6
Color: Milky white, translucent to opaque gray
Luster: Waxy to vitreous

Identified April 11, 2026More mineral →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater in the cavities (vesicles) of igneous rocks or through sedimentary processes. Most are millions of years old, often found in volcanic basalt or rhyolite environments.

Uses & applications

Commonly used in jewelry (beads, cabochons), ornamental carvings, and as 'pocket stones' in the metaphysical community. Historically used for making mortar and pestles due to hardness.

Geological facts

Agate is a variety of chalcedony characterized by its microcrystalline grain. Unlike banded agate, white agate typically features cloudy or milky inclusions of varying opacity.

Field identification & locations

Identify in the field by its waxy luster, lack of cleavage, and ability to scratch glass but not be scratched by a steel knife. Commonly found in riverbeds or volcanic regions globally, including Brazil, India, and the USA.