Gemstones: Lapis Lazuli, Spodumene (Hiddenite), Smaragdite, Iolite, Diopside, Rhodonite, Enstatite, Bronzite, Wollastonite, Crocidolite, Willemite, Vesuvianite, Allanite, Gadolinite, Epidote, Zoisite, Axinite, Danburite, Lepidolite, Scapolite, Cancrinite, Sodalite, Elaeolite, Page 180



	UNITED STATES, CANADA AND MEXICO	159

	long and 2 inches in diameter, but they are less beautiful than the small, colorless ones from Scopi, Switzerland.¹ The original locality, Danbury, Conn., never furnished any gems. Iolite occurs at Haddam, Conn., in crystals occasionally 5 inches across, which are often dark blue and sufficiently clear for cutting as gems. Dr. John Torrey possessed a fine seal made of a cube of iolite from the albite granite of Haddam, Conn., which displayed to the greatest perfection, its dichroitic properties, being blue when viewed in one direction, and white when viewed in the other, the blue being remarkably fine. This locality promised well, but the supply of gem material has been scant. An iolite-gneiss has recently been noticed by Edmund O. Hovey, at Guil- IOLITE



	ford, Conn.' It was found near the Norwich and Worcester Railroad, between the Shetucket and Quinebaug Rivers, where the gneiss has been quarried for the road. At Brimfield, Mass., on the road leading to Warren, it occurs with andalusite in gneiss, and likewise near Norwich, Conn. It is also found at Richmond, N. H., with anthophyllite in a talcose rock. In the author's collection, there is a crystal of this mineral, found at Fort George, Manhattan Island, which is almost entirely altered to pinite, an alteration common to nearly all the crystals that were formerly found at Haddam, Conn. Lepidolite is a mica containing lithia. Beautiful pink and lavender colored lepidolite has been found in large quantities at ¹ Danburite from Switzerland. Am. J. Sci. III., Vol. 24, p. 476, Dec., 1882 ; also, Vol. 25, p. 161, Feb., 1883. ^! Am. J. Sci. III., Vol. 36, p. 57, Oct., 1888.