Hematite
Image: Scott (CC BY-SA 2.0)
Mineral NameHematite
Chemical FormulaFe₂O₃
Mohs Hardness6
Crystal Systemtrigonal
Streak Colorreddish-brown
Cleavagenone
Fractureuneven to subconchoidal
Specific Gravity5.26
Colorsdark gray, black, reddish-brown
Transparencyopaque
Type LocalityVarious iron ore deposits worldwide, notably Cumbria (England), Michigan (USA), Brazil
Mineral GroupOxides
Usesiron ore, pigment, collector specimen
Associated Mineralsgoethite, quartz, limonite
Rarityuncommon
Description
This specimen displays a striking botryoidal habit, characterized by numerous rounded, grape-like masses that form a convoluted and bubbly surface, with a matte texture visible in the grayscale image.
Geological Context
Botryoidal hematite typically forms in low-temperature hydrothermal environments or as a secondary mineral in the oxidation zones of iron-rich deposits, often found lining cavities.
