a. Coal that reflects a large part of incident light, either in a definite beam or by scattering. Two kinds of bright coal are distinguished: vitrain, which reflects an incident beam in a definite direction and consequently appears light or dark according to whether the beam is or is not reflected into the eye; and clarain, which scatters the light and shows a silky luster at whatever angle it is viewed. Tomkeieff
b. A commercial term for the larger sizes of bright coal. BS, 4
Source:
Dictionary of Mining, Mineral, and Related Terms












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