mineral
Iron-stained milky quartz
Quartz (SiO₂), with iron-oxide staining
AI-generated identification · may be incorrectMostly white to translucent, massive quartz with a vitreous luster and rusty-brown iron staining. Mohs hardness 7; trigonal crystal structure, no cleavage, and conchoidal fracture; specific gravity about 2.65.
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Physical properties
Mostly white to translucent, massive quartz with a vitreous luster and rusty-brown iron staining. Mohs hardness 7; trigonal crystal structure, no cleavage, and conchoidal fracture; specific gravity about 2.65.
Formation & geological history
Quartz commonly forms as veins in fractures or cavities from silica-rich hydrothermal fluids and can also occur in pegmatites. Its age cannot be determined from the image; iron staining formed when iron-bearing minerals oxidized.
Uses & applications
Quartz is used in glass, electronics, abrasives, and ornamental objects; this rough specimen is mainly suited to collecting or display.
Geological facts
The brown coloration is likely a surface or fracture coating of iron oxides such as limonite or goethite, rather than the quartz itself.
Field identification & locations
Look for a glassy sheen, hardness sufficient to scratch ordinary glass, and absence of cleavage; quartz is widespread in many rock types worldwide.
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