Rock Classification
- Created by: Brad_ers_B
- Created on: 09-04-14 19:37
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- Rock Classification
- Igneous
- Texture: Crystalline (Interlocked minerals in a mosaic)
- No preferred alignment
- Quartz, Plagioclase and potash feldspar, Amphibole, Pyroxene, Olivine, Micas
- Formed from the crystalisation of magma
- Features: Igneous intrusions - dyke, sill, batholith or lava flow, no beds
- No Fossils
- Hard to break and does not split
- Sedimentary
- Texture: Fragmental (Grains/fragments or fossils cemented together)
- Grains are not usually lined up
- Quartz, Potash feldspar, Calcite, Mica, mainly muscovite, clay minerals, rock fragments
- Formed from the deposition of rock and mineral particles
- In beds
- May have fossils present
- May be soft and crumbly but some rocks are difficult to break if well cemented
- Metamorphic
- Crystalline (Minerals interlocked in a mosaic)
- Crystals are alignes, show foliation if affected by pressure
- Quartz, Plagioclase and potash feldspar, micas, garnet, calcite
- Formed by Recrystallisation of other rocks
- Come in large areas with no beds
- Usually no fossils but deformed if present
- Hard to break but may split into layers
- Igneous
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