Pyrite,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 chemical precipitation from acidic waters at low temperatures near the earths surface or within low- temperature hydrothermal veins.
Crystal habits-
Frequently grows as tabular,spear-shaped or cockscomb crystal aggregates to twinning.
Pyrite:
Commonly known as fools gold.
Crystal system-
Isometric/cubic
Mineral class -
Sulfide
Hardness-
6-6.5 on the MOHs scale
Rock formation environments:
Sedimentary rocks-
Forms in organic rich muds,shales,limestone and coal beds via bacterial action,sometimes replacing shells or plant debris to create pyritized fossils.
Igneous rocks-
Occurs as an accessory minor mineral cooled within magmas and volcanic environments.
Metamorphic rocks-
Grows under high heat and pressure conditions or precipitates out of hot, circulating hydrothermal vein fluids.
Quartz:
Crystal system-
Trigonal
Mineral class-
Silicate
Hardnesss-
7 on the MOHs scale
Rock formation-
Crystallizes from magma in igneous rocks like granite,precipitates in sedimentary rocks like sandstone and recrystallizes under heat and pressure in metamorphic
rocks like quartzite.
Baryte:
Crystal system-
Orthorhombic (commonly tabular or bladed crystals)
Rock formation-
Hydrothermal veins and sedimentary rock environments (like limestone and dolostone)
Mineral class-
Sulfate
Hardness-
3-3.5 on the MOHs scale
Galena:
Crystal system-
Isometric/cubic
Rock formation-
Hydrothermal veins and low temperature lead zinc replacement deposits in limestone
Mineral class-
Sulfide
Hardness-
2.5-2.75 on the MOHs scale
