How is Citrine Formed?
Citrine is the yellow variety of quartz. Natural citrine is very rare in Brazil, so most citrine is made by heating amethyst for about eight hours at 400 degrees Celsius. Not every amethyst responds: some crack, some stay unchanged and some turn milky, so the amethyst has to come from the right mine.
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But who, after all, has discovered that burnt amethyst turns yellow? A German immigrant, August Lamberts, worked with amethyst in Rio Grande do Sul. In 1883 he used some weak, pale or low value amethyst geodes to make a barbecue like the one I photographed near Ametista do Sul (RS) few years ago (see below). He roasted a barbecue for dinner, and in the morning discovered that the amethyst geodes were coloured with tints from yellow to red. Thus the Brazilian (Rio Grande) citrine industry was born.
-- Translated from original Portuguese text: Prof. Heinrich Theodor Frank’s post: https://www.facebook.com/permalink.php?story_fbid=…
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Citrine points, clusters and tumbled stones sell year-round, and shop owners can start with the citrine collection.
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Read next
What on Earth is This?What on Earth Is Ametrine?
Crystals & Well-BeingThe Ultimate Guide to Travelling with Crystals
How-To GuidesYour Guide to Birthstones & Zodiac Stones
Crystals & Well-Being4 Interior Design Statement Pieces That Shine
What on Earth is This?What on Earth Is Citrine?
What on Earth is This?What on Earth is Amethyst?
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