Question
The oldest synthetic examples of these structures have been found in red trinitite, a mineral that formed from the Trinity test. For 10 points each:
[10h] Name these structures whose discovery in an aluminum–manganese alloy won Dan Schechtman a Nobel in Chemistry. These structures can fill space but lack translational symmetry, since they are ordered but aperiodic.
ANSWER: quasicrystals [or quasiperiodic crystals]
[10m] In 2009, the first naturally-occurring quasicrystal, which is named for having this symmetry, was discovered in a Russian meteorite. This crystallographically forbidden symmetry is exhibited by buckminsterfullerene.
ANSWER: icosahedral symmetry [or icosahedrite; or the symmetry of an icosahedron; or I-sub-h]
[10e] In 2022, Bindi et al. discovered another naturally-occurring quasicrystal that forms when this phenomenon interacts with eolian dunes. Fulgurite forms when these electrostatic discharges fuse sand into a glass.
ANSWER: lightning strikes
<Other Science>
Summary
| 2024 ACF Regionals @ Cornell | 01/27/2024 | Y | 3 | 10.00 | 67% | 0% | 33% |
| 2024 ACF Regionals @ JMU | 01/27/2024 | Y | 9 | 11.11 | 100% | 11% | 0% |
| 2024 ACF Regionals @ Minnesota | 01/27/2024 | Y | 2 | 20.00 | 100% | 50% | 50% |
| 2024 ACF Regionals @ Nebraska | 01/27/2024 | Y | 6 | 13.33 | 100% | 0% | 33% |
| 2024 ACF Regionals @ Ohio State | 01/27/2024 | Y | 3 | 13.33 | 100% | 0% | 33% |
| 2024 ACF Regionals @ Rutgers | 01/27/2024 | Y | 5 | 10.00 | 80% | 0% | 20% |
| 2024 ACF Regionals @ Imperial | 01/27/2024 | Y | 8 | 13.75 | 100% | 13% | 25% |
| 2024 ACF Regionals @ Vanderbilt | 01/27/2024 | Y | 5 | 14.00 | 100% | 0% | 40% |
Data
| GWU A (UG) | Maryland B (UG) | 0 | 0 | 10 | 10 |
| UNC D (DII) | GWU B (Grad) | 0 | 0 | 10 | 10 |
| Liberty A (Grad) | UNC C (UG) | 0 | 0 | 10 | 10 |
| Liberty B (DII) | Virginia B (UG) | 0 | 0 | 10 | 10 |
| JMU A (UG) | Liberty C (DII) | 0 | 0 | 10 | 10 |
| Maryland A (Grad) | Virginia A (UG) | 0 | 10 | 10 | 20 |
| UNC B (UG) | UNC A (Grad) | 0 | 0 | 10 | 10 |
| Virginia C (UG) | Duke A (UG) | 0 | 0 | 10 | 10 |
| William & Mary A (UG) | Maryland C (DII) | 0 | 0 | 10 | 10 |