Some rocks look like colorful glass. 
-sulfate-heptahydrate-sample.jpg/800px-Iron(II)-sulfate-heptahydrate-sample.jpg)
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🖼️ Images & Media (8)
Blue vitriol monocrystal.jpg
Iron(II)-sulfate-heptahydrate-sample.jpg
Sulphuric acid 96 percent extra pure.jpg
Cobaltsulfat.JPG
Diethyl ether by Danny S. - 001.JPG
Aluminium sulfate.jpg
Síran železitý.JPG
Zinc_Sulfate.jpg
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Content adapted from Wikipedia
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Readability: FK 16.2
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Vital Level 5