New data on alstonite |
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| Authors: | Franco Sartori |
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| Institution: | Institute of Mineralogy and Petrography, University of Pisa, Italy |
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| Abstract: | New chemical and X-ray data on alstonite are reported. These indicate that alstonite is a double salt with formula CaBa(CO2)2 and that it has triclinic symmetry with a prominent orthorhombic pseudo-cell where , which correspondes closely to Gossner & Mussgnug? cell. The large number of weak super-structure reflections observed shows that the true cell (keeping the setting given by Gossner & Mussnug) has the following parameters: . The possible space groups are C1 and C1. The peculiar features of the diffraction pattern suggest that alstonite is probably an ordered member of a family of possible order-disorder structures. |
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