metamorphic
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
Hardness: 7 (quartz), 5.5-6.5 (matrix); Color: White/translucent crystals with deep reddish-brown and tan host rock; Luster: Vitreous to earthy; Crystal Structure: Hexagonal (quartz), trigonal (hematite).
- Hardness
- 7 (quartz), 5
- Luster
- Vitreous to earthy
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Physical properties
Hardness: 7 (quartz), 5.5-6.5 (matrix); Color: White/translucent crystals with deep reddish-brown and tan host rock; Luster: Vitreous to earthy; Crystal Structure: Hexagonal (quartz), trigonal (hematite).
Formation & geological history
Formed by hydrothermal fluids rich in silica filling fractures within pre-existing sedimentary or metamorphic rocks, often during tectonic activity. The red coloration is due to iron oxidation (hematite).
Uses & applications
Primarily collected as lapidary material or specimen; quartz is used in electronics and glass manufacturing; host rock minerals can be indicators for ore deposits.
Geological facts
Quartz is the most abundant mineral in the Earth's crust after feldspar. These veins often act as 'plumbing systems' for secondary mineralization, including gold in some regions.
Field identification & locations
Identify by the sharp contrast between the white crystalline quartz and the dark, iron-rich host rock. Common in mountain belts and metamorphic terrains globally.
