
metamorphic
Unakite (likely)
Epidote–K-feldspar–quartz aggregate; epidote: Ca₂(Al,Fe³⁺)₃Si₃O₁₂(OH)
AI-generated identification · may be incorrectTypically mottled pistachio-green epidote and pink/orange feldspar, with minor quartz; opaque, vitreous to dull luster, granular texture, no prominent cleavage in the tumbled form, and Mohs hardness about 6–7.…
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Physical properties
Typically mottled pistachio-green epidote and pink/orange feldspar, with minor quartz; opaque, vitreous to dull luster, granular texture, no prominent cleavage in the tumbled form, and Mohs hardness about 6–7. The specimen’s green matrix and reddish-pink patches are consistent with unakite, though the photo alone cannot exclude epidote-rich rock or serpentine with iron staining.
Formation & geological history
Forms by hydrothermal alteration or metamorphism of granite, replacing dark minerals with epidote while feldspar remains. Classic unakite occurs in the Blue Ridge Mountains of Virginia and North Carolina, generally associated with Paleozoic Appalachian geology.
Uses & applications
Commonly tumbled, polished, and carved into cabochons, beads, spheres, and ornamental objects; rarely used as a construction stone. Value is mainly decorative and collectible.
Geological facts
Its distinctive green-and-pink color contrast comes from epidote and altered feldspar rather than dye. Quartz content may appear as translucent gray or clear patches.
Field identification & locations
Identify by the naturally mottled green-pink pattern, granular texture, and relatively high hardness; a streak, hardness, and specific-gravity test would improve confidence. Common sources include the eastern United States, South Africa, Brazil, and China.
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