sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
Hardness: 6-7 (based on quartz clasts); Color: Tan, white, and rusty yellow-orange; Luster: Dull/Earthy matrix with vitreous clasts; Structure: Clastic (rounded grains in a fine matrix); Gravity: 2.6-2.7.
- Hardness
- 6-7 (based on quartz clasts)
- Color
- Tan, white, and rusty yellow-orange
- Luster
- Dull/Earthy matrix with vitreous clasts
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Physical properties
Hardness: 6-7 (based on quartz clasts); Color: Tan, white, and rusty yellow-orange; Luster: Dull/Earthy matrix with vitreous clasts; Structure: Clastic (rounded grains in a fine matrix); Gravity: 2.6-2.7.
Formation & geological history
Formed in high-energy environments like riverbeds or beaches where rounded pebbles are deposited and lithified by a mineral cement (likely silica or calcite in this case, stained by iron oxides).
Uses & applications
Primarily used as coarse aggregate in construction, road base, or as a decorative landscaping stone. Historically used as a building stone.
Geological facts
Conglomerate is often called "puddingstone" because the rounded clasts resemble raisins in a pudding. It indicates the presence of an ancient, fast-moving water source.
Field identification & locations
Identify by the presence of rounded, water-worn pebbles (clasts) larger than 2mm cemented together. Commonly found in old river drainage basins, glacial outwash, and along shorelines.
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