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a mineral of the silicate class, named for the English geologist and mineral collector A. Hume (1749–1838); in structure, isolated Si04 tetrahedrons with (OH)− and F−1 anions attached. Chemical composition, Mg7 [Si04]3(F, OH)2. Humite crystallizes in a rhombic system, forming small dipyramidal crystals and amorphous colorless or honey-yellow grains. Hardness on the mineral scale, 6–6.5; density, 3,100–3,200 kg/m3. Humite is found as a relatively rare mineral in contact-marbled limestones.