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Limestone is a 3 on the Mohs scale (1 = talc, 10 = diamond). A kiln fired brick is a 5 to 7 depending on its constituent parts.
by viggity 8y ago
Limestone is a 3 on the Mohs scale (1 = talc, 10 = diamond).
A kiln fired brick is a 5 to 7 depending on its constituent parts.
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