The exhibition at the World's Fair, at New Orleans, of the following specimens of Loudoun minerals claimed much interest from visiting mineraloguists:
1. _Specular Iron Ore_, from near Leesburg, said to be in quantity. From Professor Fontaine.
2. _Chalcopyrite_, from near Leesburg, said to be a promising vein. From Professor Fontaine.
The following were contributed by the "Eagle Mining Company," of Leesburg; F. A. Wise, general manager:
1. _Carbonate of Copper_, from vein 3' wide, developed to 25' deep. Assays by Oxford Copper Company of New York give 51 per cent of copper and 27 ounces of silver per ton.
2. _Sulphuret of Copper_, from vein 10" wide, developed to 50' deep. Assays by Oxford Copper Company of New York give 12-1/2 per cent of copper.
3. _Iron Ore_, from vein 4' wide and 50' deep. Yields 55 per cent metallic iron by assay of W. P. Lawver, of U. S. Mint.
4. _Sulphuret of Copper_, from vein developed 50'. Yields 11 per cent of copper and 1 ounce of silver per ton by assay of W. P. Lawver, U. S. Mint.
5. _Carbonate of Copper_, red oxide and glance, from vein 3' wide, developed to 25' deep. Yields 50 per cent metallic copper and 27 ounces silver per ton by assays.
6. _Iron Ore_, from vein 2' to 4' wide, developed 50'. Yield 55 per cent metallic iron.
7. _Oxide of Copper_, from Carbonate vein, developed 60' on 4' wide vein; 25' deep.
8. _Sulphuret of Copper_, from vein 8" to 15" wide, developed 50'.
10. _Barytes_, heavy spar, vein undeveloped.
11. _Iron Ore_, from 50' level of Eagle Mining Company's shaft.
12. _Marble_, from quarry of "Virginia Marble Company," three miles east from Middleburg. The deposit has been demonstrated to be of great extent; the marble has been pronounced of a very superior quality. Contributed by Major B. P. Noland.
17. _Copper Ore_, James Pinkham, from Virginia Department of Agriculture.
In the "_Handbook on the Minerals and Mineral Resources of Virginia_" prepared by the Virginia Commission to the St. Louis Exposition, Loudoun is credited with the three comparatively rare minerals given below. The two first-named occur nowhere else in the State.
"ACTINQLITE: _Calcium-magnesium-iron, Amphibole_,
Specific Gravity, 3-3.2. Hardness, 5-6. Streak, uncolored.... Fine radiated olive-green crystals are found ... at Taylorstown...."