Sample No. | Date of collapse/eruption | Date of collection | Description | Eruption Information | Crystalline silica type | |||
---|---|---|---|---|---|---|---|---|
Prismatic | Platy | Devit. cristob. | Devit. quartz. | |||||
Dome rock: | ||||||||
MVO819 | 174 k.a. BP | 15/2/98 | Dome lava; very dense, grey/brown | Ancient sample from old complex | ✓ but rare | ✓ | ✓ | ✓ |
MVO945 | 400 a BP | ? | Dome lava; Dense, red/brown | Ancient simple from Castle Peak | ✓ | × | × | ✓ |
MVO287 | 21/9/97 | 21/9/97 | Juvenile block; vesicular; light grey | From dome collapse deposit | ✓ | × | ✓ | × |
MVO288 | 21/9/97 | 21/9/97 | Juvenile block; frothy, light grey | From dome collapse deposit | ✓ but rare | × | × | × |
MVO617 | 21/9/97 | 16/5/98 | Dome lava; Dense; Green/dark grey | From dome collapse deposit | ✓ | × | ✓ | × |
MVO332 | 26/12/97 | 4/1/98 | Dome lava; Vesicular; pale grey | From 'Boxing Day' collapse deposit | ✓ | × | × | × |
MVO1236 | 12/7/03 | 1/8/03 – 15/11/03? | Dome lava; Dense; pale grey | From dome collapse deposit (full collapse) | ✓ | ✓ | ✓ | ✓ |
MVO1406 | 20/5/06 | ? | Dome lava; dense; pale grey | From dome collapse deposit | ✓ | × | ✓ | × |
MontR1* | 20/5/06 | 22/6/06 | Dome lava, dense, altered, red | From dome collapse deposit | ✓ | ✓ | × | ✓ |
Ash: | ||||||||
MRA5/6/99 | 05/6/99 | 05/6/99 | Co-PDC ash | Respirable (< 4 μm) fraction | ||||
MBA12/7/03 | 12/7/03 | 12/7/03 | Co-PDC ash | Bulk ash from which cristobalite separated |