Travertine

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Rock class:	Chemical Sedimentary Rock
Composition:	50% or more calcite.
Hardness:	3-4
Luster:	Dull, Vitreous
Color:	Yellow, Pink
Fracture:	Conchoidal
Grain:	Fine
Environment:	Precipitates from spring water, often found near rivers.
Uses:	Construction
Comments: