mineral
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS)
AI-generated identification · may be incorrectHardness: 5.5-6 (Mohs scale); Color: Silver-white to steel gray; Luster: Metallic; Crystal Structure: Monoclinic; Cleavage: Distinct; Specific Gravity: 5.9-6.2; Often produces a garlic-like odor when struck.
- Hardness
- 5
- Color
- Silver-white to steel gray
- Luster
- Metallic
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Physical properties
Hardness: 5.5-6 (Mohs scale); Color: Silver-white to steel gray; Luster: Metallic; Crystal Structure: Monoclinic; Cleavage: Distinct; Specific Gravity: 5.9-6.2; Often produces a garlic-like odor when struck.
Formation & geological history
Formed in high-temperature hydrothermal veins, often associated with gold, tin, and tungsten deposits. Geological age varies by deposit, ranging from Precambrian to Cenozoic.
Uses & applications
Primary ore of arsenic; historically used for herbicides, glass manufacturing, and semi-conductors. It is often a key indicator for prospectors seeking gold deposits.
Geological facts
Arsenopyrite is the most common arsenic-bearing mineral. When heated or struck with a hammer, it releases toxic arsenic vapors and a distinct smell of garlic, which is a key diagnostic test.
Field identification & locations
Identify by its metallic silver sheen, high density, and garlic-like smell when crushed. Commonly found in Cornwall (UK), Germany, China, and Canada. Handle with gloves and wash hands after touching.
