60.2 MB (5.1 MB compressed)
5616 x 3744 pixels
47.5 x 31.8 cm ⏐ 18.7 x 12.5 in (300dpi)
DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Hematite is a variety of iron oxide (Fe2O3), a mineral mined as one of the main ores of iron. It is also used industrially as a red pigment in paint, and in polishing compounds. This specimen has a bulbous appearance, referred to as botryoidal (grapelike), which in mining practice is referred to as kidney ore. In nature its surface is always coloured a dull yellowish to red-brown; the glossy black surface here seen is thanks to polishing. Specimen is from Taouz in Morocco, actual width 21 cm.
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