mineral
Mixed tumbled quartz specimens
Quartz, silicon dioxide (SiO₂), including rose quartz and milky/included varieties
AI-generated identification · may be incorrectHardness 7 Mohs; vitreous to waxy luster, translucent to transparent, and commonly white, pink, or pale orange. Quartz has a hexagonal crystal structure and indistinct cleavage, with conchoidal fracture; the pieces shown appear naturally broken or lightly tumbled.
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Physical properties
Hardness 7 Mohs; vitreous to waxy luster, translucent to transparent, and commonly white, pink, or pale orange. Quartz has a hexagonal crystal structure and indistinct cleavage, with conchoidal fracture; the pieces shown appear naturally broken or lightly tumbled.
Formation & geological history
Quartz forms in igneous, hydrothermal, and metamorphic environments as silica-rich fluids crystallize in cavities and fractures. Individual pieces cannot be dated visually; quartz occurrences range from Precambrian to modern geological settings.
Uses & applications
Common quartz is used in glass, electronics, abrasives, and construction; rose quartz and attractive translucent pieces are used for jewelry, ornaments, and collections.
Geological facts
The pink pieces are consistent with rose quartz or iron-stained quartz, while the greenish-white piece may be included or milky quartz. Color alone is insufficient for precise variety identification.
Field identification & locations
Identify by glassy luster, conchoidal fracture, and inability to scratch it with a steel knife; quartz scratches ordinary glass. Common worldwide, especially Brazil, Madagascar, India, and the United States.
