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a. Fibrous mineral whose fibers are longer than 5 mu m and with an aspect
ratio (length over width) equal to or greater than 3: 1 as determined by
the membrane filter method at 400X to 500X magnification (4-mm objective)
phase contrast illumination. ACGIH, 1
b. The smallest elongated crystalline unit that can be separated from a
bundle or appears to have grown individually in that shape, and that
exhibits a resemblance to organic fibers. Campbell
Source:
Dictionary of Mining, Mineral, and Related Terms
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