mineral
Iron-stained milky quartz
Quartz (SiO₂), with reddish-brown iron-oxide staining
AI-generated identification · may be incorrectWhite to pinkish, opaque to slightly translucent, with a vitreous luster and irregular fracture; Mohs hardness 7, trigonal crystal structure, and no cleavage. The color likely comes from iron oxides coating or staining the quartz.
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Physical properties
White to pinkish, opaque to slightly translucent, with a vitreous luster and irregular fracture; Mohs hardness 7, trigonal crystal structure, and no cleavage. The color likely comes from iron oxides coating or staining the quartz.
Formation & geological history
Quartz commonly forms as silica-rich fluids cool in veins and fractures; iron staining can develop later through oxidation. The specimen’s exact age and locality cannot be determined from the image.
Uses & applications
Common quartz is used in glass, ceramics, and electronics; attractive pieces may be collected or used decoratively.
Geological facts
Quartz is one of Earth’s most abundant minerals and is notably resistant to weathering.
Field identification & locations
Look for hardness sufficient to scratch glass and absence of cleavage; iron staining often appears as rusty patches. Common worldwide in veins, pegmatites, and many rock types.
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Mineral