igneous
Unakitized Granite
Granite / Altered Monzonite with Epidote
Hardness of 6-7 on the Mohs scale; displays a mottled appearance with distinct patches of pink/red orthoclase feldspar, green epidote, and clear/smoky quartz. Luster is vitreous to dull. Specific gravity is approximately 2.6-2.7.
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Physical properties
Hardness of 6-7 on the Mohs scale; displays a mottled appearance with distinct patches of pink/red orthoclase feldspar, green epidote, and clear/smoky quartz. Luster is vitreous to dull. Specific gravity is approximately 2.6-2.7.
Formation & geological history
Formed through the hydrothermal alteration of granite where plagioclase feldspar is altered to epidote. Commonly found in glacial drift, riverbeds, and mountainous regions worldwide, including the Blue Ridge Mountains of Virginia, USA.
Uses & applications
Used for ornamental carvings, tumbled stones, cabochons in jewelry, and occasionally as a decorative architectural stone.
Geological facts
The vibrant green color comes from the mineral epidote, which replaces the original plagioclase feldspar during a process called epidotization. It is a favorite among rockhounds for its striking contrast of colors when wet or polished.
Field identification & locations
Easily identifiable in the field by its distinct combination of pinkish-red and greenish patches within a granitic matrix. Collectors often look for rounded pebbles of this material in glacial outwash and stream beds.
