Limonite and Marcasite

Limonite & Marcasite Natural Mineral From The White Desert(farafra Oasis) Egypt Size- 3.6cm x 2.8cm x 2.6cm Weight- 44g You will receive the item in the photo Limonite and Marcasite differ fundamentally. Limonite is a mixture of hydrous iron oxides lacking a true Crystal system,whereas Marcasite is a distinct iron sulfide mineral with an orthorhombic crystal system. Limonite: Mineral class- Oxide/Hydroxide (mixture of minerals like goethite lepidocrocite and hematite) Crystal system- Amorphous/earthy (no true distinct crystal structure) Rock formation- forms as a secondary mineral via weathering or hydration of iron-rich precursors (magnetite hematite and pyrite ) or precipitates in bogs,soils and sedimentary environments. Marcasite- Mineral class- sulfide Crystal system- Orthorhombic (often forming tabular,bipramidal or cockscomb twinned crystals. Rock formation inside volcanic- commonly precipitates in low temperature,acidic sedimentary settings (such as shakes,limestone and chalk layers) and low temperature hydrothermal veins.