EPSC 201 Lecture Notes - Lecture 10: Chemical Reaction, Magnetite, Calcite

• School: McGill University
• Department: Earth & Planetary Sciences
• Course: EPSC 201
• Professor: Natalya Gomez

Document Summary

Each carbon atom shares one electron with four other carbon atoms to form a. Each atom bonds to four neighbors arranged in the form of a tetrahedron. Bonds between the carbon atoms are covalent: their electron clouds overlap bonds are strong. Covalent bonding of 3 carbon atoms within each sheet: within the sheets carbon atoms share their electrons with 3 other carbon atoms through covalent bonding. Diamonds originate under extremely high pressure: around 150 km deep in the upper mantle, pure carbon is compressed into the diamond structure. Rifting causes deep-mantle rock to move upward. A tiny early crystal acts as a seed for further growth. Atoms migrate to the seed and attach to the outer face. Growth moves faces outward from the center. U(cid:374)i(cid:395)ue shape (cid:396)efle(cid:272)ts the (cid:272)(cid:396)(cid:455)stal"s i(cid:374)te(cid:396)(cid:374)al ato(cid:373)i(cid:272) o(cid:396)de(cid:396) Resulting crystal shape is governed by surroundings: open space good crystal faces grow, confined space no crystals.