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a. Said of a mineral deposit (esp. of sulfides) characterized by a great
concentration of ore in one place, as opposed to a disseminated or vein
deposit.
b. Said of any rock that has a homogeneous texture or fabric over a wide
area, with an absence of layering, foliation, cleavage, or any similar
directional structure. See also: massive rock
c. Said of a mineral that is physically isotropic; i.e., lacking a platy,
fibrous, or other structure. CF: amorphous
Source:
Dictionary of Mining, Mineral, and Related Terms
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