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Obsidian
Texture: Glassy
Color: Black
Formation: Extremely Fast cooling of Silica Rich Lava
Location: Convergent zone at the surface of the continental crust
Pumice
Texture: Vesicular
Color: White/grey
Formation: Extremely Fast cooling of Felsic Rich with Gas
Location: Convergent zone at the surface of the continental crust
Ash tuff
Texture: Pyroclastic
Fragments: Less than 2mm
Formation: Welding of pyroclastic degree
Location: Convergent zone at the surface of the continental crust
Powdery sensation
Lapilili Tuff
Texture: Pyroclastic
Color: White
Fragments: Larger than 2mm
Formation: Welding of pyroclastic degree
Location: Convergent zone at the surface of the continental crust
Rhyolite
Texture: Aphantic
Color: Pink/Purple/Reddish
Composition: Felsic
Formation: Fast cooling of lava, extrusive
Location: Convergent zone at the surface of the continental crust
Andesite
Texture: Porphyritic/Aphantic
Color: Light Grey
Composition: Intermediate
Formation: First slow and then fast or fast
Location: Convergent zone at the surface of the continental crust
Basalt
Texture: Vesicular/Aphantic
Color: Black (red with oxidation)
Composition: Mafic
Formation: Fast cooling of magma with gas, extrusive
Location: Divergent boundary at the surface of the oceanic crust
Granite
Texture: Phaneritic
Color: Pinkish
Minerals: orthoclase, albite, quartz, biotite,muscovite, hornblende
Composition: Felsic
Formation: Slow cooling of magma, intrusive
Location: Convergent boundary beneath the continental crust
Diorite
Texture: Phaneritic
Color: Grey (70/30 black and white)
Minerals: albite, labradorite, quartz, biotite,muscovite, hornblende, augite
Composition: intermediate
Formation: Slow cooling of magma, intrusive
Location: Convergent boundary beneath the continental crust
Granodiorite
Texture: Phaneritic
Color: Grey (50/50 white and black)
Minerals: albite, labradorite, biotite,muscovite, hornblende, augite
Composition: Intermediate
Formation: Slow cooling of magma, intrusive
Location: Convergent boundary beneath the continental crust
Gabbro
Texture: Phaneritic
Color: Dark grey/black
Minerals: anorthite, hornblende, augite, olivine
Composition: Mafic
Formation: Slow cooling of magma
Location: Divergent boundary beneath the oceanic crust