A system of mineralogy: comprising the most recent discoveries: including full descriptions of species and their localities, chemical analyses and formulas, tables for the determination of minerals, with a treatise on mathematical crystallography and the drawing of figures of crystals

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G.P. Putnam, 1854 - 533 Seiten
 

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Seite 191 - emersion, it has lost 30 grains, which is the weight of a volume of water equal to that of the mineral. The mineral,* consequently, weighs in this instance 4 times as much as the water; for 4x30 grains
Seite 168 - vase at Brunswick. It was cut from a single stone, and has the form of a cream pot, about seven inches high and two and a half broad; on its outside, which is of a brown color, there are white and yellow groups of raised figures, representing Ceres and Triptolemus in
Seite 226 - valves, which does away with all the difficulty. The blowpipe flame consists of two cones: an inner of a blue color, and an outer, yellow. The heat is most intense just beyond the extremity of the blue flame. The inner flame is called the reduction flame, and the
Seite 45 - and Pliny, a name derived from the river Gagas in Syria, near the mouth of which it was found. The Albert coal of Nova Scotia has the appearance of asphaltum, and is partially soluble, (about 20 per cent), but it has not the fusibility of asphaltum. It is the
Seite 40 - often with some antimony and traces of iron, silver, gold, or bismuth. BB volatilizes in white fumes, having the odor of garlic; if heated nearly to redness it burns with a pale bluish flame, giving out alliaceous fumes. Native arsenic commonly occurs in veins in crystalline rocks and the older schists, and is often accompanied
Seite 194 - TENACITY. 1. Brittle ; when parts of a mineral separate in powder or grains on attempting to cut it; kerolite, calc spar. Solid minerals may be either brittle, sectile, malleable, flexible, or elastic. Fluids are either gaseous or liquid. 2. Sectile ; when pieces may be cut off with a knife without
Seite 130 - usually obtained from the beds of rivers, either in modified hexagonal prisms, or in rolled masses, accompanied by grains of magnetic iron ore, and several species of gems. The emery of Asia Minor, according to Dr. Smith, occurs in granular limestone. Blue sapphire occurs at Newton, NJ, (now rare), with hornblende, mica,
Seite 168 - as alkaline silicates. Cameos are in general made of onyx, which is well fitted for this kind of miniature sculpture. The figure is carved out of one layer, and stands in relief on another of different color. The most noted of the ancient cameos, is the
Seite 211 - also to the spinel and Oriental ruby. The Alabandic carbuncles of Pliny were so called because cut and polished at Alabanda. Hence the name Almandine, now in use. Pliny describes vessels of the capacity of a pint, formed from carbuncles, " non claros ac plerumque sordidos ac semper fulgoris horridi," devoid of lustre and beauty of color, which probably were
Seite 189 - Imperfect crystallizations: fibrous or columnar, coarse or fine, fibres often like flax; sometimes lamellar; also granular, coarse or fine, and usually strongly coherent; sometimes friable. H.=5—6. G.=2-9—3'4. Lustre vitreous to pearly on cleavage faces; fibrous varieties often silky. Color between black and white, through various shades of green, inclining to

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