metamorphic
Quartzite or Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: yellowish to white, Luster: vitreous to waxy, Crystal structure: massive/microcrystalline or granular, Cleavage: none, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: yellowish to white, Luster: vitreous to waxy, Crystal structure: massive/microcrystalline or granular, Cleavage: none, Specific gravity: 2.65
Formation & geological history
Formed by metamorphism of quartz sandstone or as a vein filling in other rocks. Rounded shape suggests it has been water-worn in a river or beach environment.
Uses & applications
Commonly used in landscaping, as gravel, or collected by rock hounds. Has no significant commercial value in small quantities.
Geological facts
Quartz is one of the most common minerals on Earth's surface. The yellow coloration is often due to iron oxide impurities (limonite).
Field identification & locations
Identify by its hardness (will scratch glass), lack of cleavage, and waxy luster. Very common in riverbeds and beaches.
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