metamorphic
Unakite or Epidosite
Epidosite (Mineral composition: Epidote, Feldspar, and Quartz)
Hardness: 6-7 (Mohs scale); Color: pistachio green with hints of pink/gray; Luster: vitreous to pearly; Crystal structure: monoclinic; Specific gravity: approx. 2.8-3.4
- Hardness
- 6-7 (Mohs scale)
- Color
- pistachio green with hints of pink/gray
- Luster
- vitreous to pearly
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Physical properties
Hardness: 6-7 (Mohs scale); Color: pistachio green with hints of pink/gray; Luster: vitreous to pearly; Crystal structure: monoclinic; Specific gravity: approx. 2.8-3.4
Formation & geological history
Formed through the hydrothermal metamorphism of igneous rocks (usually granite), where plagioclase feldspar is replaced by epidote. These formations often date back to the Proterozoic or Paleozoic eras.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and architectural stone. It is a popular ornamental stone for jewelry and metaphysical collecting.
Geological facts
Unakite is named after the Unaka Range in North Carolina, USA, where it was first discovered. It is the state rock of Virginia.
Field identification & locations
Identify in the field by its distinct 'pistachio' green color often associated with salmon-pink orthoclase feldspar. Commonly found in riverbeds in the Blue Ridge Mountains (USA), South Africa, and Brazil.
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