Agate with Geothite and Limonite inclusions that cause the stone to be iridescent. This iridescent agate is found in California, Arizona, and Mexico. A magnificent gem, it shows vivid opal-like colors when worked by a skilled lapidarist. The agate has many layers of clear agate interspersed with layers of fire which are orderly platelets of an iron mineral. Warm, red browns are most characteristic of the ground color of fire layers, but when polished, the red, green, orange, and sometimes violet fire leaps out of the stone. Fire agate is suitable for creative and exciting jewelry, but it has not yet caught on to any great extent. But there is no doubt that it is one of the most exotic gemstones.
Article published in September 1984 Lapidary Journal
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