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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
154
GEMS AND PRECIOUS STONES IN THE
the United States. The altered tiger-eye variety from the Orange River, South Africa, has been sold in polished specimens, charms, umbrella handles, etc., at Pike's Peak and other places as domestic crocidolite; it is also extensively sold as a variety of petrified wood.
Willemite (anhydrous silicate of zinc) has been found at Franklin, N. J., sufficiently transparent to make a very fair gem. The color is a rich honey-yellow, in shade between the topaz and the chrysoberyl from Brazil, having, however, the vitreous lus­tre of the Tavetsch titanite. One crystal furnished a number of gems over 8 carats in weight, which are in the collection of Frederick A. Canfield, of Dover, N. J. This mineral is gener-
WILLEMITE
ally opaque and of rich-brown or apple-green color, and it is not unlikely that fine transparent material of these shades that will cut into gems may yet be discovered.
At the Franklin (Sussex County, N. J.) zinc mines, zincite, yellow and yellowish-green willemite, and black franklinite occur mingled together in granular crystals not over 1/8 inch in diameter. This mixture, as well as the brown zinciferous serpentine from Franklin, described by Prof. Charles U. Shepard, is often ground into charms, paper-weights, and similar objects, the effect
Ch. 8: Spodumene (Hiddenite), Smaragdite, Iolite, ... Lapis Lazuli Page of 364 Ch. 8: Spodumene (Hiddenite), Smaragdite, Iolite, ... Lapis Lazuli
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