rocks
by: Nicole Quinones
THREE TYPES OF ROCKS
All rocks are composed of minerals, they are classified by how they were formed (origin) and textures.
The three types of rocks are
Igneous, Sedimentary and Metamorphic.
Igneous
- Melting and Solidification
- Formed inside the Earth's lithosphere
- Types: Intrusive is formed and Extrusive
- Texture: Glassy, Fine, Coarse, Very Coarse
Sedimentary
- Compaction and/or Cementing
- Formed in Earth's surface
- Texture: Clastic, bioclastic, and Crystalline
- Types: Inorganic, Chemically or Organic
Metamorphic
- Heat and/or Pressure
- Physically deformed and chemically changed due to different temperatures and pressures
- Texture: Foliated, Nonfoliated, and Banding
- Types: Regional and Contact
Dunite (IGNEOUS)
- Texture: Coarse
- 1 mm to 10 mm
- Nonvesicular
- Olivine
Limestone (SEDIMENTARY)
- Crystalline or Bioclastic
- Microscopic to very coarse
- Composition: Calcite
- Precipitates of biologic origin or cemented shell fragments
Gneiss (METAMORPHIC)
- Foliated and Banding
- Medium to coarse
- Composition: Mica, quartz, feldspar, amphibole, garnet and pyroxene
- High-grade metamorphism;mineral types segregate dinto bands
ROCK CYCLE
- an idealized cycle of processes undergone by rocks in the earth's crust, involving igneous intrusion, uplift, erosion, transportation, deposition as sedimentary rock, metamorphism, remelting, and further igneous intrusion.