Unakite
Unakite (Epidotized Granite) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Monoclinic and Trigonal (Aggregate rock: mixture of minerals with different systems)
Mineral Group
Silicates (Composite rock consisting of Orthoclase Feldspar, Epidote, and Quartz)
Chemical Formula
KAlSi3O8 + Ca2(Al,Fe)3(SiO4)3(OH) + SiO2
Formation Process
Metasomatic alteration of igneous granite where plagioclase feldspar is replaced by epdiote via hydrothermal fluids.
About This Crystal
An opaque, mottled rock with characteristic mossy-green and salmon-pink patches. When polished, it exhibits a vitreous to earthy luster and a granulated texture due to its multi-mineral composition.
Physical Characteristics
Color: Pink (Orthoclase), Green (Epidote), Gray/Clear (Quartz). Streak: White. Cleavage: None (rock aggregate). Fracture: Uneven to conchoidal. Specific Gravity: 2.85–3.20. Fluorescence: Generally none.
Optical Properties
Opaque; since it is an aggregate of several minerals, it does not have a single refractive index. No notable optical phenomena like asterism or chatoyancy.
Hardness & Durability
Origin Region
Notably the Unaka Mountains of North Carolina/Tennessee (USA), South Africa, China, and Brazil.
Hardness & Durability
Mohs Hardness: 6.0–7.0. It is tough and durable for jewelry, though softer than pure quartz. Good stability.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners if the stone has surface-reaching fractures. Store away from harder gems like sapphires.
Rarity & Value
Common; largely affordable. Value is based on the aesthetic balance of pink and green colors and the quality of the polish.
Special Characteristics
Known specifically for its unique 'pistachio and salmon' color combination resulting from the epidotization of granite.
Lore & History
Discovered in the Unaka Range (USA). In metaphysical traditions, it is associated with the Heart Chakra and believed to promote balance, grounding, and emotional healing.