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By: Hubbard Scientific, Co.
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Sedimentary Rock Collection
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Part Number: 727953201536
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Each contains 15 specimens representative of each type of rock. 1 1/2" X 1 1/2" rocks number-coded in a compartmented container.
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This Item Is In Stock
- Each contains 15 specimens representative of each type of rock. 1 1/2" X 1 1/2" rocks number-coded in a compartmented container.
- Rocks derived from preexisting rocks through the processes of erosion, followed by compaction, or chemical precipitation are called sedimentary rocks.
- Sedimentary rocks are grouped in three categories, clastic, chemical, and organic.
- Clastic rocks are formed by mechanical weathering.
- Weathering produces gravels, sands, and silts which are then cemented together by natural cements such as silica, iron oxides, and various carbonates to form clastic rocks.
- In the processes of weathering, rocks or parts of rocks may be dissolved.
- As the solution cools or evaporates the solid portion is deposited as a precipitate.
- Rocks formed in this way are referred to as chemical rocks.
- Rocks which are formed form the compaction of plant remains are termed organic rocks.
Samples include:
CLASTIC ROCKS
1. CONGLOMERATE is composed of reconsolidated gravel and sand particles.
2. ARKOSE is composed essentially of quartz and feldspar particles with smaller amounts of mica.
3. SANDSTONE is essentially sand-size particles cemented together by calcite, silica, or iron oxides.
4. QUARTZ SANDSTONE is a sandstone composed of quartz grains cemented together by silica.
5. OIL SHALE contains solid hydrocarbons and plant remains. Petroleum-like products can be distilled from the rock.
6. SHALE is a sediment is which the constituent particles are predominantly of clay size.
CHEMICAL ROCKS
7. ROCK SALT is crystalline and granular aggregates of sodium chloride deposited form evaporating sea waters.
8. LIMESTONE consists mainly of calcium carbonate which will yield lime when "burned".
9. ARAGONITE is deposited by hot springs and in carbonated bodies of water.
10. FOSSIL LIMESTONE is a limestone formed form shell fragments deposited in swamp-like areas.
11. DOLOMITE is composed largely of calcium magnesium carbonate and is often found inter-layered with limestone.
12. OOLITIC LIMESTONE is a limestone composed of spherical concretions, each built upon layer around some nucleus.
13. TUFA is composed of calcium carbonate deposited from solution of springs, lakes, or percolating ground water.
ORGANIC ROCK
14. LIGNITE is solidified plant materials which has proceeded further than peat but not as far as bituminous coal.
15. BITUMINOUS COAL is high in carbonaceous matter and contains between 15 to 50 percent volatile matter.
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