Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . waxedpaper and hydrofluoric acid bottles ; burning oils ; parafiine; aproduct with properties and appearance of vaseline; and a blackresidiuum which in combination with India rubber constitutes theinsulating material called okonite. In 1897 over 7000 tons were mined in Hungary. Amber or succinite is a fossil resin found chiefly along thePrussian coast of the Baltic Sea. It is usually transparent and ofa yellowish or brownish color. Its chief use is for jewelry and formouth pieces for pipes. * Mineral
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . waxedpaper and hydrofluoric acid bottles ; burning oils ; parafiine; aproduct with properties and appearance of vaseline; and a blackresidiuum which in combination with India rubber constitutes theinsulating material called okonite. In 1897 over 7000 tons were mined in Hungary. Amber or succinite is a fossil resin found chiefly along thePrussian coast of the Baltic Sea. It is usually transparent and ofa yellowish or brownish color. Its chief use is for jewelry and formouth pieces for pipes. * Mineral Industries, 1898. 340 DESCRIPTIVE MINERALOGY. DIAMOND. Composition.—C. General Description.—Transparent, rounded, isometric crys-tals with a peculiar adamantine lustre like oiled glass. Usuallycolorless or yellow, and with easy octahedral cleavage. Alsotranslucent, rough, rounded crystalline aggregates and opaquecrystalline or compact masses of gray to black color and no dis-tinct cleavage. Especially characterized by a hardness exceed-ing that of any other known substance. Fig. De Beers Mine, Kimberley, S. A. Crystallization.—Isometric. Hextetrahedral class, p. , often showing inverted triangular depressions, see , and hextetrahedral modifying faces, are most common whilerounded hexoctahedra and more rarely cubes and other formsoccur. Frequently twinned parallel to the octahedron. Index ofrefraction for yellow light Physical Characters. H., 10. Sp. gr., to Lustre, adamantine. Transparent to opaque. Streak, colorless. Tenacity, brittle. CoLORj colorless, yellow, rose, green, blue, gray, , octahedral. Before Blowpipe, Etc.—Is slowly consumed, producing itsequivalent of carbon dioxide. In powder it is burned by ordinaryblowpipe flame. Insoluble in acids. BORON, SULPHUR, CARBON, ETC. MINERALS. 341 ^Carbonado or Black Diamond.—Opaque, dark-col-ored, and without cleavage. Sp. gr., to Bort.
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