Abstract
The synthesis is described at a pressure of 250–300 kb of the garnet, majorite, previously found to occur as a shock produced phase in a chondritic meteorite. A series of new high pressure garnets containing sodium and/or titanium is also described. One of these has 25 of its silicon atoms in octahedral coordination. Garnets of these types are likely hosts for sodium in the mantle at depths of 350–650 km. Perovskite type solid solutions along the join CaTiO 3-CaSiO 3 ranging up to a composition Ca(Si 0.83Ti 0.17)O 3 have been synthesized. Experimental evidence leading to the conclusion that pure CaSiO 3 most probably transforms to a perovskite-type structure at 100 kb and 1000°C is described. CaSiO 3 perovskite is 8 percent denser than an isochemical mixture of CaO + SiO 2 (as stishovite).
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