mineral/metamorphic
Milky Quartz with Nephrite Jade
Silicon Dioxide (SiO2) with Ca2(Mg,Fe)5Si8O22(OH)2
Hardness: 6-7, Color: White to Greenish-Olive, Luster: Vitreous to Greasy, Crystal Structure: Trigonal/Monoclinic, Cleavage: Indistinct/None
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Physical properties
Hardness: 6-7, Color: White to Greenish-Olive, Luster: Vitreous to Greasy, Crystal Structure: Trigonal/Monoclinic, Cleavage: Indistinct/None
Formation & geological history
Formed in metamorphic environments where hydrothermal fluids rich in silica intrude into magnesium-rich rocks, often during regional metamorphism.
Uses & applications
Used for carvings, ornamental jewelry, cabochons, and as a collector specimen due to the contrasting colors.
Geological facts
Nephrite is one of two minerals known as jade. When found mixed with quartz, it creates a striking aesthetic contrast valued by lapidary artists.
Field identification & locations
Identify by the waxy luster and hardness; it will scratch glass but cannot be scratched by a steel knife. Common in metamorphic belts like the Cascades or Alps.
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