mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectLikely quartz, with a white-to-cream color and rusty iron staining; hardness 7 Mohs, vitreous-to-waxy luster, trigonal crystal structure, and no cleavage. The rounded shape suggests it has been tumbled or naturally smoothed.
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Physical properties
Likely quartz, with a white-to-cream color and rusty iron staining; hardness 7 Mohs, vitreous-to-waxy luster, trigonal crystal structure, and no cleavage. The rounded shape suggests it has been tumbled or naturally smoothed.
Formation & geological history
Quartz forms when silica crystallizes in igneous or hydrothermal settings and is also common in veins and metamorphic rocks. Its geological age cannot be determined from the image.
Uses & applications
Quartz is widely used in glassmaking, electronics, and construction; attractive pieces are kept as inexpensive decorative or collector specimens.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly occurs in many rock types.
Field identification & locations
A scratch test against glass can help distinguish quartz (it usually scratches glass); inspect for a glassy fracture and lack of cleavage. Quartz is found worldwide, including in Brazil, the United States, and Madagascar.
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Undetermined; the image is too blurry for reliable identification
mineral