metamorphic
Unakite (Tumbled)
Epidotized Granite
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal mix; Cleavage: Uneven; Specific Gravity: 2.85-3.20
- Hardness
- 6-7 (Mohs scale)
- Color
- Mottled green, pink, and gray
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Mottled green, pink, and gray; Luster: Vitreous to dull; Crystal structure: Monoclinic/Trigonal mix; Cleavage: Uneven; Specific Gravity: 2.85-3.20
Formation & geological history
Formed through the hydrothermal metamorphism of granite, where plagioclase feldspar is replaced by green epidote. Most specimens date back to the Proterozoic era (over 1 billion years old).
Uses & applications
Commonly used as a semi-precious gemstone for jewelry (cabochons, beads), decorative carvings, architectural stone, and as a popular stone for 'crystal healing' and metaphysical collecting.
Geological facts
Unakite was first discovered in the Unaka Range of North Carolina, USA, from which it takes its name. It is also the state rock of Virginia.
Field identification & locations
Identify by its distinctive 'pistachio green' (epidote) and 'salmon pink' (orthoclase feldspar) mottled appearance. Frequently found as stream pebbles in mountainous regions or glacial till in the Great Lakes region.
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