A Manual of Blowpipe Analysis And Determinative Mineralogy Electronic Resource
A Manual of Blowpipe Analysis And Determinative Mineralogy Electronic Resource
William Elderhorst
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Partly dissolved by caustic potassa. 8* 90 APPENDIX. FOSSIL FUEL. Anthracite. \ 215. C, with a small percentage of SiO 3, A1 2 3, and Fe 2 3 . H=2 2. 5. G=1. 3 1. 8. Lustre bright, often sub-metallic ; color iron-black, frequently iridescent. Fracture conchoidal. In a matrass, gives usually a little water, but no empyreumatic oil. Heated on platinum foil in OF1, is slowly consumed without flame, leav- ing a small quantity of ash, which consists of SiO 3, A1 2 8, and more or less Fe 2 3 . Does n...ot color a boiling solution of caustic potassa. Bituminous Goal [Common Coal]. | 216. C, H, in variable proportions; the bituminous matter con- tains from 76 to 90 per cent, of carbon ; the earthy impurities consist principally of SiO 3, A1 2 8, and CaO ; contains frequently a small amount of N and FeS 2 . Softer than anthracite, G=1. 2 1. 5. Less highly lus- trous than the preceding, and of a more purely black or brownish-black color. In a matrass, some varieties soften and cake (caking coal), while others are entirely infusible ; all varieties are decomposed, evolve com- bustible gases and empyreumatic oils, and leave a residue of more or less metallic lustre (coke), which behaves like anthracite.
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