metamorphic
Unakite or Epidote-Rich Granite
Unakite (Epidote, Orthoclase, and Quartz)
Hardness: 6-7 (Mohs scale); Color: pistachio green, pink, and grey; Luster: dull to vitreous; Crystal Structure: Monoclinic and Trigonal components; Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 (Mohs scale)
- Color
- pistachio green, pink, and grey
- Luster
- dull to vitreous
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Physical properties
Hardness: 6-7 (Mohs scale); Color: pistachio green, pink, and grey; Luster: dull to vitreous; Crystal Structure: Monoclinic and Trigonal components; Specific Gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by epidemic. This typically occurs in Precambrian to Paleozoic aged basement rocks.
Uses & applications
Used primarily in lapidary work for cabochons, beads, and animal carvings. It is also used as an architectural stone and for decorative gravel in landscaping.
Geological facts
Unakite was named after the Unaka Mountains in North Carolina and Tennessee, where it was first discovered. It is often considered a semi-precious stone due to its unique mottled appearance.
Field identification & locations
Identify by its distinctive 'pistachio ice cream and ham' appearance (green and pink mottled pattern). It is commonly found in riverbeds and on beaches in the Blue Ridge Mountains of the USA and various glacial deposits.
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