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Intrusive/Plutonic
Formed under/subsurface and slowly = large crystals, coarse grained, shiny
Extrusive/Vesicular
Formed above surface, quickly = small crystals fine grained,
Felsic
High in silicates, low in metal = lighter
Mafic
High in metal, low in silica = dark
Aphanitic
another word for extrusive/intrusive/fine grained
Porphyritic
another world for plutonic/vesicular/coarse grained
Glassy
no organization like obsidian
Pyroclastic material
ash