Its physical properties are those of quartz, but it contains more iron oxide (Fe 2 O 3) than any other variety of quartz, and experts believe that its colour arises from its iron content. We do not include invoice details in our packaging or parcels making this a great gift to send to a friend or a loved one. amethyst, a transparent, coarse-grained variety of the silica mineral quartz that is valued as a semiprecious gem for its violet colour. The Ancient Greeks attributed a number of properties to crystals and many names we use today are of Greek origin.
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