Quantcast
  Due to a new server, slow response may occur for which we apologize Portal logo
Login/Register
Bactrian Gold Treasure from Afghanistan, coming soon....
/gemstones/kunz_gems_and_precious_stones/page_180 - 2
 

Ch. 8: Spodumene (Hiddenite), Smaragdite, Iolite, ... Lapis Lazuli

Ch. 8: Spodumene (Hiddenite), Smaragdite, Iolite, ... Lapis Lazuli Page of 364 Ch. 8: Spodumene (Hiddenite), Smaragdite, Iolite, ... Lapis Lazuli Text size:minus plus Restore normal size   Mail page  Print this page
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.
Ch. 8: Spodumene (Hiddenite), Smaragdite, Iolite, ... Lapis Lazuli Page of 364 Ch. 8: Spodumene (Hiddenite), Smaragdite, Iolite, ... Lapis Lazuli
Suggested Illustrations
Other Chapters you may find useful
Other Books on this topic
bullet Tag
This Page