Mineral

Cinnabar in Quartz

Silicon Dioxide (SiO2) with Mercury Sulfide (HgS) inclusions

AI-generated identification · may be incorrect

Hardness: 7 (Quartz matrix), Color: Milky white with red/maroon spots, Luster: Vitreous to dull (water-worn), Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65 (Quartz)

Identified March 14, 2026More mineral →

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Physical properties

Hardness: 7 (Quartz matrix), Color: Milky white with red/maroon spots, Luster: Vitreous to dull (water-worn), Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65 (Quartz)

Formation & geological history

Hydrothermal formation where mercury-rich fluids permeate quartz veins or sediments. The specimen shown is a water-worn river pebble, likely from the Holocene age based on its rounded erosion.

Uses & applications

Primarily used as a lapidary material for jewelry (cabochons) and a collector's specimen. Historically, cinnabar was the main ore for mercury.

Geological facts

This specific appearance is often nicknamed 'Myrickite' when found in certain regions of the western US. Cinnabar contains mercury and should be handled with care, though it is relatively safe when encased in quartz.

Field identification & locations

Identify by the distinct 'blood-spattered' red spots against a translucent or white hard matrix. Commonly found near volcanic regions or hot springs in California, Nevada, and China. In the field, look for high-hardness river stones with bright red pigmentation.