F Feldspar 38, 39, 43, 45, 46, 54, 74 Festus 33 Fire clay 19, 24, 73 Flat River 60 Flint 14, 34 Flint fire clay 26, 73 Fool’s gold 14, 51 Fossils 12, 22, 35, 36, 52, 53, 69 Franklin County 27 Fredericktown 60 G Gabbro 13, 38, 44, 48, 73 Galena 59, 65, 74 Gasconade County 26, 27 Geiger Counter 66 Geode 42, 67 Geological Survey, Missouri 6 Glacial boulders and deposits 40, 48, 55, 65, 74 Glass “tiff,” barite 61 Gneiss 54, 73 Gold 51, 53, 65 Granite 16, 31, 38, 43, 46, 47, 49, 53, 54, 73 Graniteville 39, 43 Gypsum 19, 49, 61, 62, 63, 74 H Hardness 6, 19, 65 Heavy spar 61 Hematite 56, 66, 74 Hermann 33 Houston 62 Hydrochloric acid 10 I Igneous rock 73 Iron band diaspore 58 Iron County 39, 45, 58 Iron Mountain 56 Iron ore 56, 57 Isinglass 44