Albite and siderite crystals. Albite (white) is a plagioclase feldspar mineral that occurs in pure white or, more rarely, colourless, tabular crystals

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Albite and siderite crystals. Albite (white) is a plagioclase feldspar mineral that occurs in pure white or, more rarely, colourless, tabular crystals. Feldspars are a very common group of silicate minerals that make up as much as 60% of the Earth's crust. Siderite (brown, iron carbonate) is a valuable source of iron and is commonly found in hydrothermal veins. Specimen found in Nadabula, Hungary.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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