Fig. 2.

Stone analysis. (A) Epiluminenscence microscopic image of the stone (distance between vertical lines is 1 mm) (B) Epiluminenscence microscopic image of a cut and polished section of the epoxy resin embedded stone showing the ring like stone structure. (C—F) Quantitative analysis of ¹³C, ³¹P, ⁴⁴Ca and ⁵⁶Fe of the stone surface by laser ablation-inductively coupled plasma mass spectrometry. (G) SRμCT analysis showing aggregate structure of the stone with multiple intersected rings. The CT investigation was performed using Synchrotron Radiation at the beamline P05 operated by Hereon at the Synchrotron Radiation facility PETRA III at DESY, Hamburg, Germany. (H) Stone section under polarized light showing radial and concentric stone structure.