mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically Mohs hardness 7; cloudy white to translucent with a vitreous luster and no cleavage, breaking with uneven to conchoidal surfaces. The specimen appears massive and rough, with rusty-brown iron-oxide staining; crystal structure is trigonal.
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Physical properties
Typically Mohs hardness 7; cloudy white to translucent with a vitreous luster and no cleavage, breaking with uneven to conchoidal surfaces. The specimen appears massive and rough, with rusty-brown iron-oxide staining; crystal structure is trigonal.
Formation & geological history
Quartz commonly crystallizes from silica-rich fluids in veins and cavities, or grows during metamorphism. It occurs in rocks of many ages; the image does not reveal its geological age or exact formation setting.
Uses & applications
Commonly used for decorative stone, countertops, and silica products; attractive pieces may be polished or collected, though this rough specimen appears modest in quality.
Geological facts
Milky appearance comes from microscopic fluid or gas inclusions that scatter light. Iron oxides can stain quartz yellow to brown.
Field identification & locations
Common worldwide, especially in quartz veins and pegmatites. A glass-scratching test can help identify quartz, but confirm carefully because it may damage the sample.
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