Mohs Hardness: 3-4. Limestone is a sedimentary rock, most of which is composed of skeletal fragments of marine organisms. Most limestone is made into crushed stone and used as a construction material, including road base construction and as an aggregate in concrete. It is also a necessary ingredient in the process of purifying molten glass and steel.
UT Department of Environmental Sciences
The University of Toledo
Digital Initiatives, University of Toledo Libraries
environmental sciences; virtual exhibitions
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