metamorphic
Unakite (likely), tumbled specimens
Unakite: epidote + pink potassium feldspar + quartz; composition varies and may include chlorite
AI-generated identification · may be incorrectTypically mottled pistachio-green and salmon-pink, opaque, with a granular texture and vitreous-to-dull luster. Hardness is about 6–7 Mohs; no consistent cleavage is visible in these rounded, polished pieces; specific gravity is roughly 2.8–3.3.
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Physical properties
Typically mottled pistachio-green and salmon-pink, opaque, with a granular texture and vitreous-to-dull luster. Hardness is about 6–7 Mohs; no consistent cleavage is visible in these rounded, polished pieces; specific gravity is roughly 2.8–3.3.
Formation & geological history
Forms when granite undergoes hydrothermal alteration or low-grade metamorphism, replacing some feldspar with green epidote while retaining quartz and pink feldspar. It is generally Paleozoic to Precambrian in source terrains, depending on locality.
Uses & applications
Used for cabochons, beads, carvings, worry stones, and decorative objects; it has little industrial value but is popular as an inexpensive lapidary material.
Geological facts
The distinctive green-and-pink pattern results from contrasting epidote and altered feldspar, not dye. These appear tumbled and may have minor natural pits or fractures.
Field identification & locations
Identify it by the salmon-pink feldspar and pistachio epidote intergrowth, moderate-to-high hardness, and opaque mottled appearance; common sources include the Unaka Mountains of Tennessee and North Carolina, Brazil, South Africa, and China.
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