mineral
Iron-stained milky quartz vein
Quartz (SiO₂), with iron-oxide/hydroxide staining and minor dark inclusions
AI-generated identification · may be incorrectWhite to translucent, massive and locally crystalline; vitreous to greasy luster, no cleavage, uneven fracture, Mohs hardness 7, and specific gravity about 2.65. Orange-brown areas are likely limonite/goethite coatings or inclusions.
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Physical properties
White to translucent, massive and locally crystalline; vitreous to greasy luster, no cleavage, uneven fracture, Mohs hardness 7, and specific gravity about 2.65. Orange-brown areas are likely limonite/goethite coatings or inclusions.
Formation & geological history
Formed when silica-rich hydrothermal fluids filled fractures in surrounding rock, later acquiring oxidation staining near the surface. The exact age cannot be determined from the image and depends on its host geology.
Uses & applications
Used as a decorative and lapidary material, specimen stone, and source material for silica; usually unsuitable for high-value gemstone use because it is massive and heavily stained.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly forms resistant vein fillings. The dark patches may be altered host rock or iron/manganese minerals rather than part of the quartz itself.
Field identification & locations
Identify by its glassy white appearance, hardness, lack of cleavage, and inability to scratch it with a steel knife; iron staining produces the orange coloration. Common in hydrothermal veins worldwide, including granitic and metamorphic terrains.
