metamorphic
Tumbled pink-and-gray quartzite
Quartzite, chiefly microcrystalline quartz (SiO₂), with iron-oxide staining and possible feldspar/mica
AI-generated identification · may be incorrectHardness about 7 Mohs; opaque, pink-red and gray, with a waxy to vitreous luster and fine-grained, interlocking quartz texture. It has no obvious cleavage and breaks irregularly; the rounded shape indicates tumbling or water wear.
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Physical properties
Hardness about 7 Mohs; opaque, pink-red and gray, with a waxy to vitreous luster and fine-grained, interlocking quartz texture. It has no obvious cleavage and breaks irregularly; the rounded shape indicates tumbling or water wear.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized under heat and pressure during metamorphism, commonly in Precambrian mountain belts; this specimen’s exact age and locality cannot be determined from the image.
Uses & applications
Used as durable dimension stone, aggregate, paving, and landscaping material; attractive polished pieces are sold as inexpensive decorative or lapidary stones.
Geological facts
Its resistance to scratching and weathering is characteristic of quartzite. Pink coloration commonly results from hematite or iron-bearing mineral impurities.
Field identification & locations
Identify it by its granular, fused texture, high hardness, and inability to scratch with a steel knife; unlike sandstone, grains do not readily rub away. Common sources include India, Brazil, the United States, and Canada.
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