A System of Mineralogy: Including an Extended Treatise on Crystallography: with an Appendix, Containing the Application of Mathematics to Crystallographic Investigation, and a Mineralogical Bibliography

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Durrie & Peck, and Herrick & Noyes, 1837 - 571 pages
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Page 80 - 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,
Page 331 - It possesses the power of refracting light to a very high degree. The largest diamond of which we have any knowledge is mentioned by Tavernier, as in possession of the Great Mogul. It weighed, originally, 900 carats, or 2769'3 grains, but was reduced by cutting to 861 grains. It has the form and size of
Page 409 - poverty of ore is only made up by its facility of transport, the moderate expense of fuel, or the convenience of smelting. Its richness may in general be judged of by the color; if of a fine yellow hue, and yielding readily to the hammer, it may be considered a good ore ; but if hard and
Page 85 - 4. Bituminous; the odor of bitumen. 5. Fetid; the odor of sulphuretted hydrogen or rotten eggs. It is elicited by friction from some varieties of quartz and limestone. 6. Argillaceous; the odor of moistened clay. It is obtained from serpentine and some allied minerals, after moistening them with the breath ; others, as pyrargillite, afford it when heated. PART III. CHEMICAL
Page 45 - Reticulated; when the fibres, or columns, cross in various directions, and produce an appearance having some resemblance to a net. Stellated, or stellular; when they radiate from a centre in all directions, and produce a star-like appearance. Ex. stilbite, gypsum. Radiated, divergent; when the crystals radiate from a
Page 344 - value. It is cut with a convex surface. The largest mass of which we have any knowledge, is in the imperial cabinet of Vienna; it has almost the size of a man's fist, and weighs 17 ounces, but contains numerous fissures, and is not entirely disengaged from the matrix. This stone was
Page 352 - 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
Page 71 - 2. Shining: when an image is produced, but not a well defined image. Ex. calcareous spar, celestine. 4. Glimmering': when the reflection is very imperfect, and apparently from points scattered over the surface. Ex. flint, chalcedony. A mineral is said to be dull when there is a total absence of lustre. Ex. chalk, the ochres, kaolin.
Page 438 - and from the occurrence of insects encased in it. Of these insects, some appear evidently to have struggled after being entangled in the then viscous fluid, and occasionally a leg or wing is found some distance from the body, which had been detached in the
Page 32 - the face of the crystal, be, observes a reflected image of M, in the direction of PN. The crystal may now be so changed in its position, that the same image is seen reflected by the next face, and in the same direction, PN. To effect this, the crystal must be turned around, until

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