Figure 10
(a) Three orthogonal views of the crystals to show the crystal terminations out of the prism zone. (b) A detail of the CT images highlighting two typical features of the pseudomorphs: (a) the concavities in some faces of the prisms, which are characteristic of the penetration twins, and (b) pointed spurs close to some vertices, which are a typical feature of aragonite contact twins (see also Fig. 7). |