Marcasite

Marcasite is a popular mineral composed of iron sulfide. ^[1]

Marcasite: Quick Facts and Characteristics

Some quick facts for Marcasite:

• Transparency: Marcasite is opaque.
• Crystallography: In terms of crystallography, marcasite is orthorhombic.
• Luster: In terms of luster, marcasite is metallic.
• Streak: Marcasite streaks black, brown, dark brown or green.
• Hardness: Marcasite's hardness ranges from 6 to 6.5 on the Moh's scale.
• Specific Gravity: Marcasite's specific gravity ranges from 4.85 to 4.92.

Marcasite: Background and Summary

Marcasite is a mineral that is commonly found in sedimentary rocks, and it is a type of iron sulfide. It has a metallic luster, and it is often confused with pyrite, which is also an iron sulfide mineral. However, marcasite is less stable than pyrite and can easily oxidize and become discolored. It is also more brittle than pyrite and can easily break into small pieces.

To identify marcasite, one can look for its characteristic metallic luster and pale brass-yellow color. It often forms in small, tabular crystals or in irregular masses. It can also be identified by its hardness, which is between 6 and 6.5 on the Mohs scale.

Marcasite has several uses in industry and jewelry. It is used as a source of sulfur in the production of sulfuric acid and other chemicals. It is also used in the production of iron oxide pigments and in the manufacture of firework fuses. In jewelry, marcasite is often used as a substitute for diamonds or other precious stones. It is also used in decorative items such as buttons, buckles, and watch faces.