| Rec | Mtg# | Year | Authors | Institution | Talk title |
|---|---|---|---|---|---|
| 1 | 1196 | 1990 | Peter J. Heaney | National Museum of Natural History | The many faces of quartz: a TEM study of agates |
| 2 | 1387 | 2005 | Peter J. Heaney | Pennsylvania State University | Tiger’s-eye and pietersite: fraternal gems with disparate ancestries |