Table 1.
CT, isotope decay-(age) and PIXE (elements)-analysis of the two stones
| Distance (%) | Growth, radius (cm/year) | Growth, volume (mm3/year) | P/Ca ratio | Year of deposition (date ± year) | CT opaque (O), translucent (T) |
O/T ratio (%/%) | |
|---|---|---|---|---|---|---|---|
| Stone 1 | |||||||
| Site 1 | 0 | – | <0.05 | 1990.8 ± 0.8 | Center O | 80/20 | |
| Site 2 | 46 | 0.090 | 73 | <0.05 | 1998.5 ± 1.0 | Inside border O → T | 30/70 |
| Site 3 | 73 | 0.100 | 910 | 2002.5 ± 1.0 | Outside border T → O | 30/70 | |
| Site 4 | 100 | 0.037 | 890 | <0.05 | 2013.5 ± 0.6 | Outside layer O | 95/5 |
| Stone 2 | |||||||
| Site 1 | 0 | – | 2–3 | 2005.8 ± 1.1 | O with T inclusions | 90/10 | |
| Site 2 | 33 | 0.38 | 1100 | 0–0.3 | 2007.1 ± 1,3 | O with T inclusions | 90/10 |
| Site 3 | 66 | 0.50 | 4200 | 0.3–0.6 | 2008.1 ± 1.2 | O with T inclusions | 90/10 |
| Site 4 | 100 | 0.09 | 1600 | 0–0.3 | 2013.5 ± 0.7 | O with T inclusions | 90/10 |