Ch. 3: Precious Gem stones in 1912

Ch. 2: Platinum in 1912 Page of 93 Ch. 3: Precious Gem stones in 1912 Text size:minus plus Restore normal size   Mail page  Print this page
GEMS AND PRECIOUS STONES.                               1025
now belongs to Fuller & Person, of Louisburg, N. C. A few speci­mens have been found on Mrs. Jennie Connefi's plantation, about 2 miles southeast of Inez. Good specimens and gems are reported to have been found on the surface and in a pit at Folly Springs, about one-third of a mile southwest of Warrenton.
Warren County lies chiefly within the Piedmont Plateau region of North Carolina along the border of the Coastal Plain. Its elevation ranges from less than 200 feet above sea level along the rivers to about 500 teet in the less dissected parts of the plateau, in the western portion of the county. In general the country is nearly flat or gently rolling, with steep hills only along the larger drainage lines. War­renton is situated on a slightly dissected remnant of the plateau. Inez is located in the fork of one of the elevated ridges, and the coun­try immediately around it has small relief. The Williams and Con-nell places are on two forks of the same ridge, but are nearer Shocco Creek and accordingly in more broken country.
Amethyst has been found at two places on the Alston plantation, about 200 yards south and about 150 yards southeast of the house. Both prospects are located in a slight hollow, the former in the edge of a small patch of woods and the latter in a cultivated field. At the time of examination the prospect in the woods had been opened by a small pit and a trench about 3 feet deep and 10 feet long on the vein. These openings were about 12 feet apart in a N. 30° W.-S. 30° E. direction from each other. No rock outcrops were seen near the amethyst prospect, but the surface is covered with a light sandy soil containing scattered blocks of granite and pegmatite. The country rock around Inez is chiefly granite, with hornblende schist and mica schist both to the north and to the south for a distance of a few miles. The amethyst occurs in a vein from 1 foot to more than 2 feet thick, striking about with the workings, N. 30° W. This vein consists of irregular seams, streaks, and pockets with or without amethyst crystals, in decomposed fine granite and pegmatitic granite. Black manganese oxide is associated with the crystals and fills most of the seams and veinlets; in places it occurs as small botryoidal and stalactitic masses. Many of the crystals are partly or entirely coated with this manganese oxide, and it is only by breaking them or scraping off the coating that the quality of the stone can be deter­mined.
The crystals are rather stout and range from a fraction of an inch to 3 inches in diameter.. The majority have transparent clear por­tions, suitable for gems when the color is good. The crystals range from practically colorless amethystine to rich dark purple; They have a distinctive reddish-violet tint and yield brilliant gems. Under artificial light these gems lose nothing of their beauty but become an even more beautiful lively reddish purple. In many crystals the color is not evenly distributed but is arranged in layers or streaks parallel to certain crystal faces. One transparent frac­tured crystal from this locality exhibits a remarkable color variation when viewed in transmitted light. The light transmitted directly through the the crystal is a beautiful reddish purple. That trans­mitted with an interior reflection is a magnificent bluish purple.
About half a bushel of rough crystals were obtained from the two openings. Of these possibly a quart were suitable for cutting into gems of especially fine quality, 2 quarts could be cut into gems of
Ch. 2: Platinum in 1912 Page of 93 Ch. 3: Precious Gem stones in 1912
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US Geol. Surv. 1912. Gemstones, Metals.
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