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Chalcedonies include many types of cryptocrystalline quartz ... (At one time, amethyst was also considered a precious gem, but large reserves were later found in Brazil, reducing its value.) ...

What gives gemstones colors, or rather ... Let’s look at some examples. Amethyst, a type of quartz, owes its captivating ...

Most people know some very basic information about minerals, crystals, and gemstones, but likely wouldn’t be sure about what ...

Religion and superstition pervaded all aspects of Roman life, and other types of gemstone were thought to possess supernatural powers. The name 'amethyst' encapsulates the supposed powers of the ...