Please enable JavaScript.
Coggle requires JavaScript to display documents.
Rocks - Coggle Diagram
Rocks
Igneous
Born of magma
Origin
Extrusive
Formed on surface
quick cool
Volcanic
Intrusive
Formed beneath surface
slow cool
Plutonic
Texture
Aphanitic
no visible crystals
Glassy
Cooled very quickly
no water
Pyroclastic
Volcanic eruptions - ash and bombs
Pegmatitic
Massive crystals
Phaneritic
small visible crystals
Porphyritic
slow cool then rapid cool
fine vs coarse
trapped air = bubbles
"Frothy"
Composition/Color
Mafic
High Fe, Mg
Low silica
black/dark gray
Intermediate
light/medium gray
Felsic
High silica
Low Fe, Mg
white/pink