Explanation
A metamorphic rock formed by metasomatic alteration of acidic intrusive rocks under the action of high-temperature gasification hydrothermal solution. It is often gray, white, grayish green, or light pink in color. It has medium coarse grained scale granular balastic texture, and can be seen with hypidiomorphic granular texture, hypidiomorphic granite texture, metasomatic pseudomorphic texture, etc. Massive structure. The main minerals are mainly quartze, muscovilte, lepidolite, quartze is mostly less than 50%, and fluorite, topaz, tourmaline. The secondary minerals include apatite, malachite, beryl, manganese aluminum iron almandine, etc. The common metal minerals are cassiterite, wolframite, molybdenite, bismuthinite, arsenojpyrite, pyrite and other sulfides. The content of the main mineral assemblages of rock varies greatly, and fluorite, topaz, tourmaline, etc. can be concentrated in belts and show zoning. It is generally distributed in the surrounding rock near the edge of the moderately deep granite intrusion body and the contact zone. It is closely related to Sn, Mo, Bi, As, Be, Nb, Ta and other mineral deposits. greisen is widely distributed.
Classification
Natural materials and products -> Mineral materials