Conglomerate
Rock
Common
Rounded pebbles set in finer sand, silt or clay and cemented together; less than one per cent of sedimentary rock. The jagged peaks of Montserrat and the cliff of Dunnottar Castle are conglomerate; with angular stones it is breccia.
Rock
- Kind of rock
- Clastic sedimentary rock
- Rock family
- Sandstone, shale and clay
- Texture
- clastic (grains cemented together)
- Also contains
- Calcite, Quartz, Hematite
- Shapes the land into
- Cliff, Mountain
- How it forms
- Gravels rounded and laid down by rivers or glaciers are buried and cemented by calcite, iron oxide, silica or clay.
- Uses
- Strong enough to build with, as at Montserrat.
Identity
- Also known as
- Puddingstone
Crystallography
- Habits
- Massive, Rounded
Physical properties
- Luster
- Dull
- Colors
- red, green, gray, brown
- Transparency
- Opaque
Geology
- Origins
- Sedimentary
- Geography
- Spain (Montserrat), Scotland (Dunnottar, Angus coast)
Classification
- Rarity
- Common
- Gem quality
- No
Sources
- Conglomerate (geology). Wikipedia.
- C. R. Hallsworth, R. W. O’B. Knox, BGS Rock Classification Scheme, Volume 3: Classification of sediments and sedimentary rocks (Research Report RR 99-03). British Geological Survey, 1999.
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