Werneria Volume 1-2; With Notes According to the Improvements of Klaproth, Vauquelin, and Hauy (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1805 Excerpt: ...gravity 2--33; hard as jasper nearly. Melts at 151 of Wedgwood into a spongy and semi-transparent mass. In this substance fire in the earth has begun ta glaze, or slightly vitrify its surface, like pottery over-baked. Heliotrope.--Specific gravity from 2 fJ2 to 2--7. At-114 of Wedgwood grows-brown. Hello8 From Egypt, Iceland, and Siberia comes; Rich in green shades with spots of red, and no With ochre-yellow; by heat degenerates To reddish brown, hut scarce is fused With aid of oxygene.------. SPECIES XXXIV. Wood-Stone, bois Petrifie, Holzstein, Lithoxylon. Lithoxylon in Martinique abounds, And varies as the wood it represents. SPECIES XXXV.--Felspar. Felspar with varied tints abounds; flesh red And grey, but scarcely ever black is found, trope is bloody jasper-quartz, and distinguishable from agate-quartz of a dark-green, dotted with red, by its opacity, since the agate-quarte with a similar face is transparent. Petrified Wood is agate-quartz, or wood incrusted. Quartz sometimes incrusts foreign substances, and particularly the dog's tooth calcareous spar, the metastatique of Hauy, and dent de cochon of De Lisle. Felspar.--The essential character is in its natural joints equally distinct, in two directions, perpenAnd rarely blue, or green. Transparent now With pearly hue, and iridescent rays, And now opaque; in fracture foliate, In crystals tetrahedrally disposed, Obliquely truncate, and in rhomboids forra'd. dicular the one upon the other. Spec. grav. 2--4378 to 2--7045. Cuts glass, and sparkles when struck against the steel; has a double refraction when cut into facets; very little electricity, and some phosphorescence, if rubbed one piece against another in the dark. According to Kirwan, any compound of silex and alumine, in which silex prevails, with l...