166	GEMS AND PRECIOUS STONES IN THE
	Desert, Me., material that would cut into fair gems is occasionally met with. Several light-green crystals, over 6 inches long, and one over 10, were found in the Allen Mica Mines, Amelia Court House, Va. From the Pike's Peak locality one dealer sold over $8,000 worth as specimens, at prices as high as $200 for a single specimen. Over $1,000 worth from this place is annually cut into tourists' jewelry. In Middletown, Delaware County, Pa., many shades of green feldspar, passing into cassinite and delawa-rite, are found in the soil in loose boulders, up to 20 inches in diameter. In the Allen Mica Mines many hundreds of tons of rich green cleavages of amazonstone, some 6 or 8 inches across, were found in mining for mica, and this is so plentiful that it merits attention in the arts.
	AMAZONSTONE
	Perthite, abundant at Perth, Ontario, is found in the United States as boulders, and possibly in place. This mineral forms a very curious and rich-colored gem stone, with bright aventurine reflections. Peristerite, associated with common orthoclase, has been found crystallized in great abundance in the town of Macomb, St. Lawrence County, N. Y. Many of the specimens show the beautiful light-blue chatoyant effect. It has also been observed as far north as Bythurst, Canada, nine miles north of Perth, in the townships of Pierrepont and Russell, and in at least a dozen other places in northern New York. Occasionally it makes a