DIFFERENT ROCKS

GRANITE (IGNEOUS)

• Course grained
• Intrusive
• Cools near mantle
• Cooled underground

BASALT (IGNEOUS)

• Fine grained
• Smaller crystals formed
• Extrusive
• Cooled above ground at fast rate
• Cools on land

OBSIDIAN (IGNEOUS)

• Glassy, no crystals formed
• Extrusive, cooled above ground at the fastest rate
• Cools in water

MARBLE (METAMORPHIC)

• Forms when limestone is subjected to the heat and pressure of metamorphism
• Many different colors of this rock

SLATE (METAMORPHIC)

• Fine grained
• Results from the heat and pressure of shale

SCHIST

• Medium grained rock
• Slate is the parent rock
• Generally smooth
• Variations of colors

GNEISS (METAMORPHIC)

• Coarse grained
• Caused by segregation of rocks, usually light and dark silicates

QUARTZITE (METAMORPHIC)

• Granular
• Sandstone is converted into quartzite through heating and pressure

CONGLOMERATE (SEDIMENTARY)

• Composed of many round particles
• They are pressed and cemented together.
• Different from breccia

SANDSTONE (SEDIMENTARY)

• Clastic rock
• Made up of small sandlike particles lithified together

SHALE (SEDIMENTARY)

• Fine grained (clastic)
• Composed of mud mixed with clay and other minerals such as calcite
• And quartz

ROCKSALT (SEDIMENTARY)

• Composed of sodium chloride
• The other name for it is halite
• Halite forms into rock like salt crystals

LIMESTONE (SEDIMENTARY)

• composed from skeletal remains of marine organisms buried in the ground
• Commonlycomposed of: skeletal remains of foraminifera and coral.