Crystals of haematite in quartz

Crystals of haematite in quartz

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Caption: Crystals of haematite in quartz. Hematite (black, centre) is a variety of iron oxide (Fe2O3), mined as one of the main ores of iron. The specimen shown here has a bulbous appearance, also referred to as botryoidal (grape-like). It is a small specimen, less than a millimetre across. The surrounding mineral (white) is quartz, a form of silica (silicon dioxide, SiO2). This specimen is from St Just, Cornwall, England.

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Keywords: botryoidal, britain, british, close-up, cornwall, crystal, crystalline, crystals, detail, england, english, europe, european, fe2o3, geochemistry, geological, geology, grape-like, hematite, iron oxide, mineral, mineralogy, minerals, quartz, si02, silica, silicon dioxide, st just, uk, united kingdom

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