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What is the difference between

What is the difference between "Crushed Stone" and ...

slag: Also called cinder. the more or less completely fused and vitrified matter separated during the reduction of a metal from its ore. "Stone" and "gravel" are descriptive of the size / particle distribution or even the source of a material, while "slag" is a type of material, irrespective of particle size or even shape. I think he intended to specify where the material would be sourced "rock" (from a quarry), "gravel" .

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Section 902 AGGREGATES

Section 902 AGGREGATES

Reverberatory Furnace Slag. A nonmetallic byproduct of refined copper ore. Steel Furnace Slag. A synthetic byproduct of basic oxygen, electric or openhearth steel furnaces that primarily consists of a fused mixture of oxides of calcium, silica, iron, alumina, and magnesia. Crushed Concrete Aggregate. Crushed portland cement concrete.

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