Where is Quartz with Cinnabar found?
SiO2 with HgS
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Open the appQuartz with Cinnabar occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Quartz with Cinnabar
Almadén, Spain
Historically the world's largest mercury mine, known for exceptional cinnabar specimens, often associated with quartz and dolomite.
Idrija, Slovenia
Another historically significant mercury mining district, producing cinnabar in various matrices, including quartz.
Huancavelica, Peru
Known for its rich mercury deposits, where cinnabar is found in hydrothermal veins with quartz.
New Almaden, California, USA
A major mercury producer in the United States, with cinnabar occurring in quartz veins and breccias.
Guizhou Province, China
A significant source of high-quality cinnabar specimens, often found in association with quartz, calcite, and dolomite.
Terlingua, Texas, USA
Known for its mercury deposits, where cinnabar is found in veins and disseminated in sedimentary rocks, sometimes with quartz.
Collecting tips
- Safety First. Cinnabar is a mercury sulfide and is toxic. Always handle specimens with gloves. Avoid inhaling dust, and do not ingest. Wash hands thoroughly after handling. Do not grind, cut, or heat cinnabar specimens, as this can release toxic mercury vapor. Store specimens in sealed containers away from children and pets.
- Look for Hydrothermal Veins. Focus your search in areas known for low-temperature hydrothermal activity, especially near volcanic or hot spring systems. Cinnabar often forms in veins cutting through host rocks.
- Identify Associated Minerals. Cinnabar is frequently found with other minerals such as pyrite, marcasite, stibnite, calcite, dolomite, and various forms of silica (quartz, chalcedony, opal). The presence of these minerals can indicate a favorable environment.
- Color and Luster. The distinctive vermilion red color and adamantine luster of cinnabar are key identifiers. Look for these red specks or coatings within or on quartz crystals or masses.
- Geological Maps. Consult geological maps of known mercury mining districts or areas with documented hydrothermal mineralization. These maps can pinpoint specific localities or geological formations likely to host cinnabar.
Quick Check
- Color:
- Red (cinnabar) on colorless, white, or smoky (quartz)
- Luster:
- Vitreous (quartz) to adamantine/sub-metallic (cinnabar)
- Streak:
- Scarlet red (cinnabar)
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