450 trans. st. louis acad. scienck. 



Halite. 



In incrustations and in the water of many springs, especially in Saline 

 Co. and Howard Co. 



SILICA. 

 Quartz. 



At Scotia Iron Banks, Crawford Co., rock crystals, sometimes several 

 inches long and often enclosing wax-yellow Jasper, in cavities of Spe- 

 cular Iron Ore. Rarely Amethyst crystals on Jasper. 

 In South-east Missouri, in transparent grains, sometimes of smoky 

 Quartz, in granites, and in porphyries. Amethyst crystals in quartz 

 veins, traversing the granite, in Madison Co.: Banded Agate in por- 

 phyry in Iron Co.; Transparent Qjaartz with Specular Ore in con- 

 glomerates at Pilot Knob, Iron Co. Large quantities of Quartz 

 geodes, mammillarjt and drusy Quartz on the surface of dolomitic 

 limestone hills. 

 Feldspar. 



In South-east Missouri, in the granites and porphyries. Flesh-colored 

 Orthoclase in the granite of Brown's Quarry and in other localities; 

 white or pink crystals, \-\ of an inch long, in porphyry, probably 

 Oligoclase. 

 Mica. 



'iie2ir Einstein Silver Mine, Madison Co., Muscovite with Quartz. In 



the granites of S.E. Missouri Mica is but rarely found. 

 In the sandstone of the Coal-measures, abundant in minute scales. 

 Hornblende. 



In South-east Missouri, especially Madison Co., in syenitic granite and 

 in Dolerite. Acicular crystals of Actinolite in Qiiartzite. 

 Asbestos. 



In Madison Co., in long silky fibres, in small pockets between layers of 

 Dolerite. 

 Epidote. 



Massive, or with fibrous structure, in the granites and porphyries of S.E. 

 Missouri, especially Iron Co., Madison Co., and St. Frangois Co. 

 Serpentine. 



In the porphyry region of 5. W. Missouri, especially in Iron Co. and 

 Madison Co., massive, of light grass-green color, hardness = 2-3, with 

 greasy or waxy lustre. Mostly enclosing microscopic crystals of Mag- 

 netite. 

 Chlorite. 



In S.E. Missouri, in granites of Madison Co.: also impregnating the 

 groundmass of some of the porphyries. 

 Garnet. 



Common Garnet in "Drift boulders" in Northern Missouri. 



