metamorphic
Milky Quartz with Fuchsite inclusion
Silicon Dioxide (SiO2) with Chromium-rich Muscovite
Hardness: 7 (quartz) to 2.5 (fuchsite inclusions); Color: White, pale green, and translucent gray; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture).
- Hardness
- 7 (quartz) to 2
- Color
- White, pale green, and translucent gray
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (quartz) to 2.5 (fuchsite inclusions); Color: White, pale green, and translucent gray; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed in metamorphic rocks such as phyllites or schists where quartz veins are common. The green color is often provided by chromium-rich mica (fuchsite) within the quartz matrix. Most specimens date from several hundred million years ago.
Uses & applications
Primarily used as a decorative stone, in lapidary work for cabochons, and as a collector's specimen. Quartz itself is used in glassmaking and electronics.
Geological facts
This combination is sometimes marketed as 'Green Quartz' or incorrectly as 'Jadeite'. Fuchsite is named after the German chemist Johann Nepomuk von Fuchs. The green color in the mica is caused by trace amounts of chromium trivalent ions.
Field identification & locations
Identify in the field by its hardness (will scratch glass) and its characteristic white-to-green mottled appearance. Often found in riverbeds near metamorphic belts or in hydrothermal vein deposits.
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