mineral
Quartz with Arsenopyrite
Silicon Dioxide (SiO2) with Iron Arsenic Sulfide (FeAsS)
AI-generated identification · may be incorrectQuartz: Hardness 7, Transparent/White, Vitreous luster, Trigonal system. Arsenopyrite: Hardness 5.5-6, Metallic luster, Steel-gray color, Monoclinic/Triclinic system, brittle.
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Physical properties
Quartz: Hardness 7, Transparent/White, Vitreous luster, Trigonal system. Arsenopyrite: Hardness 5.5-6, Metallic luster, Steel-gray color, Monoclinic/Triclinic system, brittle.
Formation & geological history
Formed in high-temperature hydrothermal veins and pegmatites. These minerals often precipitate together from mineral-rich fluids escaping from cooling magma; they vary in age from millions to billions of years depending on the deposit location.
Uses & applications
Aesthetics and mineral collecting. Quartz is used in electronics and glass; Arsenopyrite is the primary ore of arsenic used in pesticides and wood preservatives.
Geological facts
Arsenopyrite is often called 'Mispickel'; it gives off a distinct garlic odor when crushed or heated due to its arsenic content. This combination specimen is highly sought after by collectors for its contrast.
Field identification & locations
Identify by quartz crystal habit (hexagonal prisms) and the metallic, striated gray crystals of arsenopyrite. Common in Panasqueira (Portugal) and Yaogangxian (China). Use caution when handling: wash hands after touching to avoid arsenic residue.
