metamorphic
Cinnabar in Dolomite or Quartz (Cinnabrite)
Mercury sulfide (HgS) in Dolomite (CaMg(CO3)2)
Hardness: 2-3 for Cinnabar, 3.5-4 for Dolomite; Color: White or cream base with pink to red streaks/spots; Luster: Pearly to earthy; Structure: Trigonal/Rhombohedral; Cleavage: Perfect.
- Hardness
- 2-3 for Cinnabar, 3
- Color
- White or cream base with pink to red streaks/spots
- Luster
- Pearly to earthy
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Physical properties
Hardness: 2-3 for Cinnabar, 3.5-4 for Dolomite; Color: White or cream base with pink to red streaks/spots; Luster: Pearly to earthy; Structure: Trigonal/Rhombohedral; Cleavage: Perfect.
Formation & geological history
Formed in low-temperature hydrothermal veins and near volcanic activity where mercury-bearing fluids permeate host rock, often during the late stages of volcanic cooling.
Uses & applications
Primarily used as a decorative stone, for lapidary work (cabochons, carvings), and as a collector's specimen. Historically, cinnabar was the main ore of mercury.
Geological facts
The red streaks are caused by Cinnabar, which is the primary ore for mercury. Due to the mercury content, it is advised to wash hands after handling raw specimens.
Field identification & locations
Identify by its distinct 'blood-splattered' appearance on a light-colored matrix. Commonly found in areas of past volcanic activity such as Peru, Spain, and China.
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