igneous
Milky quartz vein rock
Quartz-rich hydrothermal vein; predominantly silicon dioxide (SiO₂), with minor iron-oxide staining and possible feldspar or host-rock fragments
AI-generated identification · may be incorrectHardness about 7 Mohs; white to gray, translucent patches, vitreous to waxy luster, irregular fracture, no obvious cleavage, and specific gravity near 2.65. The rusty red-brown areas likely reflect oxidized iron minerals.
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Physical properties
Hardness about 7 Mohs; white to gray, translucent patches, vitreous to waxy luster, irregular fracture, no obvious cleavage, and specific gravity near 2.65. The rusty red-brown areas likely reflect oxidized iron minerals.
Formation & geological history
Formed when silica-rich hydrothermal fluids filled fractures and crystallized, commonly during late stages of igneous activity; its precise age cannot be determined from the image. It may include altered wall rock along the vein margins.
Uses & applications
Used as a silica source, aggregate, and ornamental stone; attractive translucent pieces may be cut or polished, though this specimen appears mainly suitable for collecting.
Geological facts
Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge when mechanically stressed. Vein quartz commonly records ancient fluid movement through fractured crust.
Field identification & locations
Identify by its glassy appearance, hardness—scratching ordinary glass—and lack of cleavage; quartz will not fizz in dilute acid. Common in hydrothermal veins worldwide, especially mountain belts and mineralized districts.
