Marcasite
Marcasite is a sulfide mineral known for its striking metallic crystals, with known Chinese sources.
About Marcasite
Marcasite is classified as a sulfide mineral in the marcasite group and has the chemical formula FeS2. It crystallizes in the orthorhombic system and has a distinctive metallic presence in any collection.
Identification & care
Crystals commonly develop as tabular, lenticular crystals; 'cockscomb' twins; 'spear' twins; nodular; stalactitic; often replaces fossils. Its color is typically pale yellow, tin-white and brass-yellow (paler and more silvery than pyrite). The luster is metallic, splendent, the streak is dark gray to black, and specimens are typically opaque. The cleavage is distinct on {101}. The fracture is uneven, which aids identification.
Collector context
Collector notes
In the metallic-crystal category, Marcasite is a consistent target for serious collectors. Marcasite is widely represented across Chinese provinces, including Fujian, Gansu, Anhui, Guangdong.