sedimentary

Quartzite in Conglomerate

Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale (quartz inclusion); Color: Tan to grey matrix with translucent white/grey quartz; Luster: Dull/earthy matrix with vitreous clast; Structure: Fragmental/Clastic; Cleavage: None

Hardness: 7 on Mohs scale (quartz inclusion)
Color: Tan to grey matrix with translucent white/grey quartz
Luster: Dull/earthy matrix with vitreous clast

Identified May 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the lithification of rounded gravel and sand grains over millions of years. This specimen appears to be a conglomerate where a quartz clast is embedded in a fine-grained sedimentary matrix.

Uses & applications

Primarily used as aggregate in construction, road base, and decorative landscaping stones. Higher quality quartz pieces are used in jewelry or as collectibles.

Geological facts

Conglomerates are known as 'puddingstones' in some regions because they look like raisins in a pudding. They require a high-energy environment like a fast-moving river or beach to transport the heavy pebbles.

Field identification & locations

Identify by looking for rounded pebbles (clasts) cemented together by a finer-grained material. If the embedded stone is harder than glass, it is likely quartz/quartzite.