Pyrite,Marcasite,Baryte,Quartz and galena It forms when oxygen rich

It forms when oxygen rich groundwater weathers primary copper sulfide minerals

Zincite with franklinite from ogdensburg Franklin mining district New Jersey USA

Pyrolusite from tachgagalt mine

Mica from Brazil

Pyrite,Marcasite,Baryte,Quartz and galena It forms when oxygen richPyrite,Marcasite,Baryte,galena and Quartz from Oumjane mine Morocco Size 7. 7cm x 5. 6cm x 4. 4cm Weight 116g You will receive the item in the photo Marcasite: Marcasite is an iron sulfide mineral. Mineral class: Sulfides Crystal system: Orthorhombic Hardness: 6 6. 5 on the MOHs scale Rock formation and environments: Rock environments Commonly precipitates in sedimentary rocks such as chalk,limestone, shale and coal beds. Formation process Forms via