âWell Mr. Customer, let me go check with my manager to make sure the car is still available and work out the best figures that will help you make the best decision.â Show your customer your proof book or evidence manual when you run for the numbers.
Laboratory tests are usually negative in patients with HADD. CHA crystals are 75-250 nm, and are not visible with light microscopy, except when the crystals form aggregates. The CHA crystals are non-birefringent in polarized light.
Not all ionic crystals are brittle. Alkali halide crystals (such as NaCl), which are made from singly charged ions, are not particularly brittle, although they are usually easy to cleave. Crystals made from doubly charged ions (such as MgO) are usually brittle, because they have much stronger Coulomb forces between the ions. Brittle crystals are ones in which it is difficult to create and move dislocation lines. See: Dislocation creep - Wikipedia.