igneous
Granitoid (with Epidote and Orthoclase)
Crystalline Felsic Intrusive Rock (containing SiO2, KAlSi3O8, and Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))
Hardness: 6.0-7.0 (Mohs); Color: Pink (orthoclase), green (epidote), white/clear (quartz); Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained) crystalline.
- Hardness
- 6
- Color
- Pink (orthoclase), green (epidote), white/clear (quartz)
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6.0-7.0 (Mohs); Color: Pink (orthoclase), green (epidote), white/clear (quartz); Luster: Vitreous to dull; Structure: Phaneritic (coarse-grained) crystalline.
Formation & geological history
Formed from the slow cooling of silica-rich magma deep beneath the Earth's surface (plutonic). The green epidote suggests secondary hydrothermal alteration or low-grade metamorphism of the primary minerals.
Uses & applications
Primarily used as a decorative stone, aggregate in construction, or as a specimen for geological study and mineral collecting.
Geological facts
The presence of green epidote alongside pink feldspar is common in altered granites and is sometimes specifically referred to as Unakite when the colors are well-blended.
Field identification & locations
Identify by the distinct interlocking crystals of pink K-feldspar, translucent quartz, and the characteristic pistachio-green color of epidote. Commonly found in continental crust orogens.
