A popular treatise on gems, in reference to their scientific value; a guide for the teacher of natural sciences, the jeweller, and amateur: together with a description of the elements of mineralogy, and all ornamental and architectural materials .. (1859)
Feuchtwanger, Lewis. [from old catalog] · New York, D. Appleton & company · leaf 73
able varieties of Iceland spar. When the crystalsunite in a face of the rhombohedron R,-fig. 82, they forman angle of 89° 8, difiering little from a right angle, bywhich the occurrence of this law is very easily recognized,especially in prismatic varieties. In the rhombic system, twin crystals with… … Fig. 83. Fig. 84, Fig. 85. carbonate of lead, marcasite, stephanite, mispickel, andother minerals. In arragonite the crystals partly interpen- FOEM OF MINEEALS. 67 etrate, partly are in mere juxJ;aposition, as in fig. 83, wherethe individuals are formed by the combination qoP(J!/) .00 Poo (A), Poo…
Precious stones · Building stones · Mineralogy
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