释义 |
humite
humite (ˈhjuːmaɪt) n (Geological Science) mineralogy a mineral, transparent vitreous brown to orange in colour, found in the volcanic matter on VesuviusHumite
humite[′hyü‚mīt] (mineralogy) A humic coal mineral. A series of magnesium neosilicate minerals closely related in crystal structure and chemical composition. Humite 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. |