Slate is generally classified as a hard stone when evaluating its resistance to compression, weathering, and scratching compared to soft sedimentary rocks like gypsum or unsealed limestone. On the Mohs scale of mineral hardness, slate typically rates around 4 out of 10, meaning it is harder than fingernails and soft brass but can be scratched by harder steel tools or quartz sand. While it possesses great compressive strength and durability for architectural loads, it is softer and more vulnerable to point-impact fracture than igneous rocks like granite. This moderate hardness allows stonemasons to cut, shape, and split the stone cleanly without destroying the material during processing.
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