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Red Quartz (Heat-Treated Citrine) Cluster Deep, dark orangey-red clusters — this is quartz, most likely low-grade amethyst, that's been heat-treated to bring out an intense red-orange color. While often sold as Citrine in the market, natural Citrine has a paler yellow color and is much more rare.  Sold as a no-frills Geo Pick: no box, no label, just the raw cluster shipped as-is at a price that reflects that simplicity. Perfect for studying up close or sitting on your desk. Take a magnifier to it and see what you might find. Sizes run thumbnail to miniature. As a Geo Pick item, we select the piece — a great way to add a bold pop of color to a collection without the premium price tag.  Heat treatment is a common, industry-standard process for citrine and does not affect the durability of the quartz — this is quartz on the Mohs hardness scale (7), handling daily use well.