igneous
Quartz vein rock (likely iron-stained milky quartz in host rock)
Predominantly quartz (SiO₂), with rusty iron-oxide staining and possible feldspar/host-rock fragments
AI-generated identification · may be incorrectOpaque white to cream quartz with rusty red-brown patches and irregular fracture; quartz hardness 7, vitreous to dull luster, trigonal crystal structure, no cleavage. The photo does not show enough detail to identify the host rock confidently.
Identified More igneous →
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Physical properties
Opaque white to cream quartz with rusty red-brown patches and irregular fracture; quartz hardness 7, vitreous to dull luster, trigonal crystal structure, no cleavage. The photo does not show enough detail to identify the host rock confidently.
Formation & geological history
Likely formed when silica-rich fluids filled fractures and crystallized as a quartz vein; iron-bearing minerals later oxidized. The vein’s age depends on its local host geology and cannot be determined from appearance alone.
Uses & applications
Commonly collected as a hand specimen; quartz is also used in glass, electronics, and construction aggregate, though this piece appears to have little commercial value.
Geological facts
Milky quartz is the most common quartz variety; iron oxides can produce vivid rusty staining along cracks and surfaces.
Field identification & locations
Look for hardness near 7, glassy fracture surfaces, and resistance to scratching by a steel knife. Quartz veins occur worldwide, especially in fractured igneous and metamorphic terrains.
