Arrow-heads of chalcedony.”
The yellow jasper used for mosaics comes chiefly from Sicily, but as good could be obtained in many places in our own country. The green jasper of the present time is obtained chiefly in the Urals and is to a considerable extent worked there into ornamental pieces. The Chinese prize green jasper highly, the seal of the Emperor being made from it. Some jasper of a bluish shade is found in Nature, but that of a deep blue tinge is always artificially colored by Prussian blue. It is then sometimes known as “false lapis,” that is, false lapis lazuli. Ribbon jasper is found in Saxony, but chiefly comes from the Urals. The qualities which make jasper of use in the arts are its color, opacity and capacity for taking a polish. At the present time it is not much used except for mosaic work and for small boxes, vases and dishes. The ancients, however, prized it highly and used it extensively. It is one of the stones prescribed in the Book of Exodus to be worn in the ephod of the High Priest and also forms one of the gates of the Holy City as described by St. John in Revelations. It is probable that the jasper referred to in these instances was of a dark green color, as this was the tint most prized in early times. Green jasper was also called emerald in some instances. The banded varieties were much used for cameos, specimens of which are still extant. By taking advantage of the colors of the different layers, colored objects were made, such as one which shows the head of a warrior in red, his helmet green and breastplate yellow.
Basanite is also known as Lydian stone or touchstone on account of its use for trying the purity of metals. Its value for this purpose depends on its hardness, peculiar grain and black color. Different alloys of gold give different colors on the stone which one soon learns to recognize, and jewelers become very skillful in judging of the fineness of gold by this test. Also if an object is plated, by giving it a few strokes on the stone the different color of the gold and base will be revealed. It is simply a black variety of crypto-crystalline quartz, differing from jasper in being tougher and of finer grain and from hornstone in not being splintery.
Flint is likewise an opaque quartz of dull color. It differs from jasper in breaking with a deeply conchoidal fracture and a sharp cutting edge. It is also often slightly transparent and has a somewhat glassy luster. These properties have led to its extensive use by the Indians and by nearly all primitive peoples for the manufacture of weapons and implements. Hornstone is more brittle than flint and has a splintery rather than a conchoidal fracture. A number of other subvarieties of crypto-crystalline quartz occur, but they are not important.
Oliver Cummings Farrington.
MIDWINTER.
The air is like a beryl, clean and clear,
Intensified by gleaming points of blue.
Sharp-outlined, distant sounds come ringing near
And crisply pierce the brittle silence through.