Unakite
Unakite (Metamorphosed Granite consisting of Epidote, Orthoclase, and Quartz) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Monoclinic (Epidote/Orthoclase) and Trigonal (Quartz); Massive/Mottled habit
Mineral Group
Silicates (specifically a rock composed of mixed silicates)
Chemical Formula
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH) (Epidote) + KAlSi3O8 (Orthoclase) + SiO2 (Quartz)
Formation Process
Metamorphic; specifically hydrothermal alteration of granite where plagioclase feldspar is replaced by epidote
About This Crystal
A mottled, opaque stone featuring a patchwork of mossy-green epidote and salmon-pink orthoclase feldspar, often with grey quartz inclusions. It has a vitreous to dull luster depending on the polish.
Physical Characteristics
Color: Pink and green; Streak: White; Cleavage: None (as a rock); Fracture: Uneven to conchoidal; Specific Gravity: 2.85–3.20; Fluorescence: Generally none.
Optical Properties
Opaque; No significant optical phenomena; Refractive index varies between constituent minerals (Approx 1.52 to 1.76).
Hardness & Durability
Origin Region
Unaka Mountains (USA), South Africa, Sierra Leone, Brazil, and China
Hardness & Durability
Mohs Hardness: 6.0–7.0; Toughness: Fair to good; Stable under normal light and heat, but sensitive to strong acids.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners and harsh chemicals; store separately to prevent scratching softer stones.
Rarity & Value
Common and affordable; Value is determined by the balance of pink and green colors and the quality of the polish; Rarely treated.
Special Characteristics
Distinguishing 'pistachio' green and 'salmon' pink color combination; may contain minor magnetite or zircon inclusions.
Lore & History
Named after the Unaka Range in North Carolina, USA. In metaphysical tradition, it is known as a stone of vision and balance, associated with the heart chakra and grounding energies.