at
Amelia Court House, Virginia, by Mr. George W. Fiss, of Philadelphia,
who had two very fine gems over one-fourth of an inch across.
Peristerite has
been found in some abundance in the town of McComb, Saint Lawrence
county, New York, associated with common orthoclase; it occurs by the
ton, and many of the specimens show the beautiful light blue chatoyant
effect. Mr. C. D. Nimms has also observed this mineral as far north as
Bythurst, Canada, 9 miles north of Perth; also in the towns of
Pierrepont, Russell, and in at least a dozen other places in this
section of New York State. Some specimens make a very fine gem stone,
differing somewhat from labradorite and moonstone. Mr. Charles A. Dana,
of New York, has had a number of these flesh-colored pebbles of
orthoclase found on Long Island sound, near his home, at Glen Cove, New
York, cut en cabochon, making thus a very effective salmon-colored stone.
Perthite, found
so plenty in Canada, at Perth, Ontario, is likely to be found in the
United States as bowlders, and possibly in place. This forms a very
curious and rich-colored gem stone, with its bright aven-turine
reflections.
A
very fine oligoclase occurs at Dixon's quarry, Newcastle county, and a
fine striated variety at West Chester, Delaware county, Pennsylvania.
Sunstone.—Very
good sunstone (oligoclase ?), with very fine reflections, has been
found near Fairville, Pennsbury township, Pennsylvania. Sunstone
(oligoclase ?) occurs at Mendenhall's lime quarries, Pennsbury,
Chester county; also in Ashton township, some of which is a
grayish-white color with coppery reflections; and also a curious
variety of sunstone in moonstone (albite) is found, showing double
reflections.
A
very fine green and red sunstone is found near Media. On John
Scofield's farm, in Middletown township, Delaware county, moonstone and
sunstone in small nodular lumps are scattered through the soil. About 1
ton has been taken out since the locality was discovered. On John
Hibberd's farm, in the same township, moonstone in bowlders is found. A
very fine sunstone, the orthoclase of which is a very rich salmon color
and quite transparent and streaked with white, showing the aventurine
effect beautifully, is found at Glen Riddle, Delaware county.
Another
beautiful variety is found in the hornblende at Kennett township,
Chester county; this, Dr. Genth thinks, is most probably an oligoclase.
The greenish orthoclase, sometimes in bright green pieces, also pale
green, and at times much spotted with brownish tints, all showing a
very good sunstone effect, is found at Mineral hill, Middle-town, and
in Upper Providence, Delaware county. The orthoclase of Frankford,
Pennsylvania, with the gothite disseminated through it, approaches the
sunstone in appearance very closely.
On the Horace Greeley farm, at Chappaqua(a), New York, small pieces
a "Proceedings New York Academy of Sciences," Vol. I.
