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Dark Colored Minerals with Non-Metallic Lusters

PHYSICAL PROPERTIES				MINERAL NAME, FORMULA
	Harder than Glass	NO Cleavage	[MORE PROPERTIES]	GARNET, (Fe,Mg,Ca)₃Al₂Si₃O₁₂
				QUARTZ, SiO₂
				OLIVINE, (Mg,Fe)₂SiO₄
		Cleavage	[MORE PROPERTIES]	HORNBLENDE, NaCa₂(Mg,Fe,Al)₅(Al,Si)₈O₂₂(OH)₂
				AUGITE, Ca(Mg,Fe)Si₂O₆
				PLAGIOCLASE FELDSPAR, (Ca,Na)(Al,Si)₄O₈, Ca>Na
				EPIDOTE, Ca₂FeAl₂Si₃O₁₂(OH)
				GARNET, (Fe,Mg,Ca)₃Al₂Si₃O₁₂
	Softer than Glass	Cleavage	[MORE PROPERTIES]	BIOTITE, K(Fe,Mg)₃AlSi₃O₁₀(OH)₂
				CHLORITE, (Mg,Fe)₆Si₄O₁₀(OH)₈
				CALCITE, CaCO₃
				DOLOMITE, CaMg(CO₃)₂

What is the hardness of the mineral? [Harder than Glass]---[Softer than Glass]

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