metamorphic
Quartz vein rock, likely iron-stained quartzite or hydrothermal quartz
Mostly quartz (SiO₂), with iron oxides and minor feldspar or mica
AI-generated identification · may be incorrectWhite to translucent gray quartz crystals in a pink-orange, rusty matrix; vitreous luster and massive to granular texture. Quartz hardness is Mohs 7, has no cleavage, conchoidal fracture, and specific gravity about 2.65; the specimen’s exact host rock is uncertain from the image.
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Physical properties
White to translucent gray quartz crystals in a pink-orange, rusty matrix; vitreous luster and massive to granular texture. Quartz hardness is Mohs 7, has no cleavage, conchoidal fracture, and specific gravity about 2.65; the specimen’s exact host rock is uncertain from the image.
Formation & geological history
Likely formed when silica-rich hydrothermal fluids filled fractures, depositing quartz, followed by oxidation of iron-bearing impurities; alternatively, it may be recrystallized quartzite. Such veins occur from Precambrian to recent geological settings.
Uses & applications
Used as decorative and lapidary material, silica aggregate, and occasionally a source of industrial quartz; attractive crystal-rich pieces are collected rather than used structurally.
Geological facts
The orange-red coloration is typically hematite or limonite staining, while translucent crystals indicate relatively pure quartz. The irregular central cavity may represent a small vug lined with quartz crystals.
Field identification & locations
Identify it by its glassy luster, hardness, lack of cleavage, and ability to scratch ordinary glass; vinegar will not react. Common in hydrothermal vein districts, metamorphic belts, and mineralized zones worldwide.
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