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What is the hardness of bornite?

What is the hardness of bornite? 3 Hardness is 3, streak pale grayish black. Bornite occurs with chalcopyrite and chalcocite, both more important as ores, in copper deposits that typically form as zones of contact metamorphism […]

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Do freestanding decks need footings?

Do freestanding decks need footings? Freestanding decks that are not attached to the house with a ledger board will require an additional beam and row of footings. Decks with lots of angles may also require additional […]

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