b. Micaceous Oxide of Iron. Sources of the St. Francis river, Missouri. A vein of this ore, several feet wide, is found in red sienite, on the banks of the river St. Francis, at the Narrows, Madison county, Missouri Territory. Its unusual appearance has for several years attracted the attention of the inhabitants. It is situated four miles south of the extensive lead-mines of La Motte, and in the centre of a highly interesting geological and mineralogical section of country. The rocks at that place are the old red granite and sienite, in mountain masses, with veins of greenstone, greenstone porphyry, and gneiss.
c. Red Oxide of Iron. Flint river, Tennessee.
d. Brown Hæmatite. On the dividing ridge between Strawberry and Spring rivers, Arkansas.
e. Argillaceous Oxide of Iron—Ironstone. Banks of the Monongahela, Pennsylvania.
f. Sulphuret of Iron. Accompanying the ores and vein-stones of the Missouri lead-mines.
g. Magnetic Oxide of Iron. Fifteen miles below the Hot Springs, on the Washita river, Arkansas. In quantity.
45. Black Oxide of Manganese. On Big Sandy river, Kentucky. Also, on the sources of the Maramec and Spring rivers, Missouri, accompanied by the brown oxide of iron.
46. Native Copper. Scattered masses of this metal have been found on Big river, and also in a shaft sunk near Harrisonville, Illinois. Nothing, however, is known in America, to equal the vast quantities of this metal found in the trap veins on the banks of lake Superior.
47. Sulphate of Copper. On the Washita river, fifteen miles below the Hot Springs, Arkansas.