metamorphic
Jasper and Epidote (Unakite-like specimen)
Epidotized granite or Jasper with Epidote inclusions
Hardness: 6-7 on Mohs scale. Color: Mottled olive-green and yellowish-tan with reddish-brown veins. Luster: Dull to waxy when raw, vitreous when wet. Structure: Massive/Microcrystalline. Specific Gravity: 2.85-3.20.
- Hardness
- 6-7 on Mohs scale
- Luster
- Dull to waxy when raw, vitreous when wet
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Physical properties
Hardness: 6-7 on Mohs scale. Color: Mottled olive-green and yellowish-tan with reddish-brown veins. Luster: Dull to waxy when raw, vitreous when wet. Structure: Massive/Microcrystalline. Specific Gravity: 2.85-3.20.
Formation & geological history
Formed through the hydrothermal metamorphism of granitic rocks, where plagioclase feldspar is replaced by epidote. Often found as stream-rounded pebbles in riverbeds.
Uses & applications
Used primarily for lapidary work, including cabochons, beads, and stone carvings. Also valued as a landscape stone or collector's specimen.
Geological facts
The green color is primarily due to the presence of epidote, while the tan or reddish streaks usually come from feldspar or iron-stained quartz/jasper. It is often found in the Blue Ridge Mountains of the United States.
Field identification & locations
Identify in the field by its distinct mottled green and tan appearance and high hardness (it will scratch glass). Commonly found in riverbeds and glacial tills in metamorphic terrains.
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