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and as a precious metal for thousands of years
Amethyst is a form of Quartz which gets its beautiful purple tint from the substitution of silicone for iron due to irradiation
Approx 420 million years old
from the Upper Silurian age
Crinoid Plate Quartz and as a precious metalSpecies Scyphocrinites elegans, from the Upper Silurian age. Approx 420 million years old.
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