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The surface structures of hematite crystals from nine localities are ob served with an ordinary reflecting and a phase contrast microscope, and the step heights of growth layers as well as the other surface features are measured precisely with multiple-beam interferometric method and the method of fringes of equal chromatic order. On the basis of these observations and measurements, mechanism of crystal growth, natural etching, twin formation and movement of screw dislocations after thedoi:10.2465/minerj1953.3.59 fatcat:ispexpjfrbg4fj6drxk7xk4o2a