mineral

White Agate (Chalcedony)

Agate (Silicon Dioxide - SiO2)

Hardness: 6.5-7 on Mohs scale. Color: Translucent cloudy white to opaque milky white. Luster: Waxy to vitreous. Crystal structure: Microcrystalline (trigonal system). Cleavage: None (conchoidal fracture). Specific Gravity: 2.58–2.64.

Hardness: 6
Color: Translucent cloudy white to opaque milky white
Luster: Waxy to vitreous

Identified March 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from groundwater in the cavities (vesicles) of igneous rocks or sedimentary deposits. These processes occur over millions of years across various geological ages from the Precambrian to recent periods.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and carvings. Historically used for making mortars and pestles due to hardness. Popular in metaphysical jewelry and as pocket stones.

Geological facts

Agate is a variety of chalcedony characterized by its microcrystalline texture. While many agates are banded, solid white specimens are often referred to as 'Peace Agate' in collector communities. It is chemically identical to quartz but has a different internal structure.

Field identification & locations

Identify in the field by its waxy appearance and inability to be scratched by a steel knife. Frequently found in riverbeds, beaches, or volcanic regions globally, notably in Brazil, India, and the Lake Superior region of the US.

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