“The sample is 6 cm x 4 cm with 1 cm cuboctahedral Pyrochlore crystals. This sample is from one of the few localities where Pyrochlore crystals occur in matrix, in this case a felsic syenite. The Pyrochlore crystals are a deep brown colour, resinous luster and are semi-transparent. Pavel Kartashov in an April 6, 2012 message says: Most of usual transparent reddish-brown pyrochlores from carbonatites of Vishnevye Mts are fluorcalciopyrochlores. Brown opaque pyrochlores from nepheline syenites are still fluorcalciopyrochlores transitive to hydroxycalciopyrochlores or hydroxycalciopyrochlores. Large crystals able to contain black cores of U- and Ti-rich zerovalent-dominant pyrochlore (~betafite). Egg-yellow products of their final alteration often are hydropyrochlores. Nedosekova et al. (2021) has an analysis of the Zone #140 Pyrochlore with: (Ca 1.068, Na 0.854 Sr 0.024)2 (Nb 1.861, Ti 0.137)2 06 F 0.843. Other pyrochlores of the carbonatite complex have slightly different chemistry. They have a photograph of their analyzed Zone #140 sample that is similar to this sample but it has colourless coarse-grained Calcite covering the Pyrochlore crystals. The black mica phase from this locality has been determined to be Annite by Pavel Kartashov. ”

“The sample is 6 cm x 4 cm with 1 cm cuboctahedral Pyrochlore crystals. This sample is from one of the few localities where Pyrochlore crystals occur in matrix, in this case a felsic syenite. The Pyrochlore crystals are a deep brown colour, resinous luster and are semi-transparent. This is a vertical view of the sample down the cube face of the main Pyrochlore crystal. ”