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The brackets in the chemical formula mean that iron and aluminum can represent each other to a limited extent ( substitution)
For drinking water
Iris Agate is a real eye-catcher
Dieser Edelstein ist nicht nur ein optisches Highlight
There you will find other aquamarines as well as other minerals such as amethysts
Achatisierter Amethyst Druse aus Uruguay (155g) - helle Amethyste Baryt The brackets in the chemicalAmethyst , a jewel of natural beauty, is the violet variety of the mineral quartz. Like quartz, this gemstone consists of silicon dioxide (SiO2), but with additional small amounts of color giving iron . Amethyst is a versatile gemstone that is both aesthetically and energetically valuable. It crystallizes in the trigonal crystal system and forms prismatic, long crystals. This beautiful specimen contains an agate setting which makes it a special
