| Title | Comment | Keywords |
|---|---|---|
| Mineral's Environment of Formation | 17:33 - 19:00 (01:27) / 1.6 MB | "J. Lawford Anderson", mineral, "atomic structure", "physical property", diamond, graphite, "environment of formation", "crystal structure", gem, carbon, atom, "covalent bond", "soft bond", hardness |
| Depth and Pressure | 19:00 - 19:45 (00:45) / 0.8 MB | "J. Lawford Anderson", "covalent bond", carbon, atom, diamond, graphite, "layered crystal structure", pressure, depth, mantle |