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.
13. Marble, from same as above.
14. Marble, from same as above.
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,
Ca (Mg Fe)3(Si O4)3.
Specific Gravity, 3-3.2. Hardness, 5-6. Streak, uncolored.... Fine radiated olive-green crystals are found ... at Taylorstown...."
"Tremolite: A variety of Amphibole. Calcium.