sedimentary
Quartzite in Conglomerate
Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions
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
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Physical properties
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
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.
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