SiO₂ - Mohs Hardness: 7. Fine amethysts are featured in the British Crown Jewels and they were also a favorite of Catherine the Great and Egyptian royalty. Amethyst also holds a high place in the ranks of the Christian church and was referred to as "the stone of bishops".
The University of Toledo
Digital Initiatives, University of Toledo Libraries
environmental sciences; virtual exhibitions
UT Department of Environmental Sciences
virtual exhibition; science;
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