What do the terms mean?

Created by ASLgirl007 

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Aphanitic

cyrstals too small to see easily without a magnifying glass

Bioclastic

formed from living organisms (shells) settling out of water

Chemical precipitate

material forming directly out of dissolved materials in water (like making rock candy)

Clastic or detrital

formed from materials settling out of water

Eolian

formed from wind sediments

Extrusive

form outside of the earth's crust or just barely under- cooling rapidly

Fissile

refers to sedimentary rocks that easily split into layers (shales)

Fluvial

formed in river beds

Foliated

appears to be layers of crystalline rock- term used for metamorphic rocks only

intrusive

formed inside of the earths crust, plutons are intrusive, cool slowly

lacustrine

formed in lakes

Mafic

high in ferromagnesium silicates (olivine, biotite, hornblend)

Phaneritic

having easily visible crystals

plutonic

rock formed from magma that penetrated other rocks- dikes, sills, batholiths

Sialic

high in non-ferromagnesium silicates (feldspars, muscovite, quartz)

Vesicular

has vesicles (holes) which are apparent

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