Quartz Pebble (Iron-Stained)

Physical Properties

Hardness: 7 (Mohs scale), Color: tan to creamy orange (due to iron inclusions), Luster: vitreous to waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & Geological History

Formed from silica-rich hydrothermal fluids or within igneous/metamorphic environments. This specimen is a water-worn pebble, meaning it was eroded from its primary source and smoothed by tumble action in a river or beach over thousands of years.

Uses & Applications

Common quartz is used in glass making, abrasive manufacturing, and building materials. Smooth pebbles like this are often used in landscaping, decorative stone vases, or as 'worry stones'.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which originally meant 'hard'.

Field Identification & Locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage (it breaks in smooth curves like glass). These are commonly found in riverbeds, gravel pits, and coastal shores.

Identified on: 4/13/2026

Mode: Standard