metamorphic
Jasper and Epidote in Quartzite
Metamorphic rock containing microcrystalline quartz, epidote, and jasper
Hardness of 6-7 on the Mohs scale; green groundmass with distinctive purplish-red patches; vitreous to dull luster; massive crystal structure; conchoidal fracture with no prominent cleavage; specific gravity around 2.6-3.2.
Identified More metamorphic →
Explore Jasper and Epidote in Quartzite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6-7 on the Mohs scale; green groundmass with distinctive purplish-red patches; vitreous to dull luster; massive crystal structure; conchoidal fracture with no prominent cleavage; specific gravity around 2.6-3.2.
Formation & geological history
Formed through regional or hydrothermal metamorphism where silica-rich sedimentary rocks (quartzite) were altered and infiltrated by iron- and calcium-rich fluids, creating epidote (green) and jasper (purple/red) inclusions over millions of years.
Uses & applications
Used primarily as a decorative stone, lapidary material for cabochons and carvings, and as a specimen for rock and mineral collectors.
Geological facts
Pebbles and stones like this are frequently smoothed by glacial action or river tumbling, leaving distinct color contrasts that make them prized finds for beach and rivercombing enthusiasts.
Field identification & locations
Can be identified in the field by its distinct green and purple/red color combination and high hardness (scratches glass). Commonly found in glacial drift, riverbeds, and mountainous regions with complex tectonic histories.
More like this
