GEOL 2540 Lecture Notes - Lecture 20: Cassiterite, Lepidocrocite, Goethite

• School: University of Manitoba
• Department: Geological Sciences
• Course: GEOL 2540
• Professor: Chakhmouradian Anton

Document Summary

Corundum al2o3 hcp of o atoms in which 2/3 of hcp of o atoms in which 2/3 of octahedral interstices host al3+ * silica poor igneous rocks (especially syenites, basalts) * regional metamorphic rocks (especially gneisses and marbles) Fe2o3 regional metamorphic rocks (especially regional metamorphic rocks (especially. Precambrian from fe-rich sediments) hydrothermal veins oxidation of fe minerals (e. g. in bauxite and limonite) Fe3+ ti o + y/6(o ) yfe2+tio + (x+y/3)fe2++fe3+ o. 2xtiyo4 + y/6(o2) yfe2+tio3 + (x+y/3)fe2++fe3+ magnetite-ulv spinel s. s. ilmenite magnetite. A = mg , mn2+, fe 2+, c o , ni, c u, zn, ti4+, g e 4+ M al3+ v3+ c 3+ m 3+ f 2+ f 3+ B = mg , a l3+, v3+, c r3+, mn3+, fe 2+, fe 3+ Regional and contact metamorphic rocks after dolostones rocks after dolostones. Camg( co3) 2 + al2si2o5( oh) 4 mgal2o4 + camgsi2o6 + caco3 + 2h2o + co2.