Grain Size Silicic Intermediate Mafic Ultramafic
Coarse Granite Diorite Gabbro Peridotite
(>5mm)
Medium Microgranite Microdiorite Dolerite
(15mm)
Rhyolite Andersite Basalt
Fine (<1mm)
(only igneous rock with
flow banding)
Pumice
Obsidian
Glassy
Quartz 30% Plagioclase 70% Plagioclase 60% Olivine 50%
Main Orthoclase 45% Hornblende + Biotite Pryoxene 40% Pyroxene 50%
minerals…
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