K2 Stone Generator Tower 6 1/4 inch OR 7 1/2 inch Sale! from $44.00 USD /per Size a. 6 1/4 inches 1lb. 3oz. b. 7 1/2 inches 1lb. 4 oz. Produc variants a. 6 1/4 inches 1lb. 3oz. b. 7 1/2 inches 1lb. 4 oz. Qty. Add to Cart Couldn't load pickup availability Refresh Azurite in granite Mohs Hardness - about 6 (See video after pictures for full view.)