Geology R1031 and R5061

Handout #4

Rock Types	Mineral
Rock Types	Group Name	Subgroup	Name	Formula
Igneous
Basalt / Gabbro	Feldspar	Plagioclase	Anorthite	CaAl₂Si₂O₈
	Feldspar		Albite	NaAlSi₃O₈
	Pyroxene	Clinopyroxene	Augite	Ca(Mg,Fe)Si₂O₆
	Pyroxene	Orthopyroxene	Bronzite	(Mg,Fe)₂Si₂O₆
	Olivine		Forsterite	Mg₂SiO₄
	Olivine		Fayalite	Fe₂SiO₄
	Fe-Ti-Cr Oxides		Ilmenite	FeTiO₃
	Fe-Ti-Cr Oxides		Magnetite	Fe₃O₄
Rhyolite / Granite	Silica Minerals		Quartz	SiO₂
	Feldspar	Alkali	Orthoclase	KAlSiO
	Micas		Muscovite	KAlSiO (OH)
	Micas		Biotite	K(Mg,Fe)-(Al,Ti,Fe)-(Si-Al -)O(OH)
Sedimentary
Sandstone			Quartz	SiO₂
Shale			Quartz	SiO₂
Shale	Clay Minerals		Kaolinite	Al₄ Si₄ O₁₀ (OH)₈
Limestone	Carbonates		Calcite	CaCO₃
Limestone	Carbonates		Dolomite	(Ca,Mg)CO₃
Metamorphic
Slate			Quartz	SiO₂
	Clay Minerals		Illite	K_1-1.5 Al_4- (Si_6.5-7 Al_1-1.5 )O₂₀ (OH)₄
	Sheet Silicates		Chlorite	(Mg,Fe,Al)₁₂ (Si,Al)₈ O₂₀ (OH)₄
Schist*	Amphibole		Hornblende	(Na,K) _0-1 Ca₂ (Mg, Fe ³⁺ , Fe , Al)₆ (Si _6-7 Al _2-1 ) O₂₂ (OH)₂
Schist*	Al-Silicates		Kyanite	Al₂SiO₅
Gneiss*		Garnet	Almandine	(Mg,Fe)₃Al₂Si₃O₁₂

*Plus quartz, feldspars, and micas.

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Last Updated: 7/23/96

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