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The Goldie carbonatite of Fremont County, Colorado, and its associated rocks contain a fetid gas shown to consist of a mixture of Cs and C6 hydrocarbons, F2, HF and FzO. The fluorine has been derived from fluorite. Similar gases are characteristic of thorium veins in the same alkalic igneous district to the east and of various alkalic rocks around the Iron Hill alkalic-carbonatitic complex in Gunnison County, Colorado These Colorado occurrences are similar to those previously reported from aikalic rocks of the Kola Peninsula, U.S.S.R. The gases are believed to be of magmatic origin. h.rrnooucrroN The general geological features of the alkalic igneous province west and southwest of Canon City, Colorado, have been described by Heinrich and Dahlem (1965). The Goldie carbonatite (Heinrich and Quon, 1963) lies in the dike halo of the McClure Mountain-Iron Mountain complex, the largest of the three alkalic intrusive masses in the province. Most of the thorite veins occur east and southeast of the McClure complex, and are genetically associated with the Democrat Creek body (Heinrich, 1958; Christman et, al., 1959). Mineralogically, the Goldie carbonatite is one of the most unusual in the world. Most of it consists of limonite-stained calcite, with local masses of barite. In one of the prospect pits there are exposed replacement nodules of aluminofluoride minerals which consist of various of the assemblage: cryolite, gearksutite(?), pachnolite, weberite, prosopite and ralstonite, together with abundant purple, radioactive fluorite (Heinrich and Quon, 1963). The sequence of rocks across the carbonatite is: Hanging rvall 1. Biotite gneiss
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