Conglomerate with Quartz Inclusions

Physical Properties

Hardness: 6-7 (on Mohs scale); Color: Grayish-tan matrix with clear to white inclusions; Luster: Dull/Earthy matrix with Vitreous inclusions; Structure: Clastic; Cleavage: None; Specific Gravity: ~2.6-2.7

Formation & Geological History

Formed through the lithification of rounded gravel and boulders, typically in high-energy environments like riverbeds or alluvial fans over millions of years

Uses & Applications

Used primarily in the construction industry as coarse aggregate for concrete and road building; also of interest to amateur rock collectors

Geological Facts

Conglomerates are essentially 'nature's concrete.' The presence of clear quartz within the matrix suggests the sediment source was rich in igneous quartz veins

Field Identification & Locations

Identify in the field by looking for rounded rock fragments (clasts) larger than 2mm cemented together. Found globally in ancient river systems

Identified on: 5/19/2026

Mode: Standard