A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 24
... sulphuric acid dissolves it with a separation of Silica . It Saussurite is found with Diallage in Gabbros ; very tena- cious and very heavy ; greenish - gray or greenish - white , rather dull . Hardness 5.5 to 6.5 . Specific gravity ...
... sulphuric acid dissolves it with a separation of Silica . It Saussurite is found with Diallage in Gabbros ; very tena- cious and very heavy ; greenish - gray or greenish - white , rather dull . Hardness 5.5 to 6.5 . Specific gravity ...
Page 27
... sulphuric acid , leaving a residue of pearly scales of Silica . One variety of this class is Rubellan , of a rose - red , opaque or black . The Magnesian Micas alter more readily than the Potash Micas , and exfoliate in innumerable ...
... sulphuric acid , leaving a residue of pearly scales of Silica . One variety of this class is Rubellan , of a rose - red , opaque or black . The Magnesian Micas alter more readily than the Potash Micas , and exfoliate in innumerable ...
Page 28
... sulphuric acid . Finally we have the Pennines , having optical form and pro- perties of the rhombohedral system ; they have also a basic cleavage , greasy lustre and the general properties of the Chlorites . Ottrelite ( Hydrated ...
... sulphuric acid . Finally we have the Pennines , having optical form and pro- perties of the rhombohedral system ; they have also a basic cleavage , greasy lustre and the general properties of the Chlorites . Ottrelite ( Hydrated ...
Page 29
... sulphuric acid . Pyrophyllite ( Silicate and Hydrate of Alumina ) .- Contains sometimes a little Magnesia or Iron oxides ; is found in right prisms with a rhombic base , cleavable and elongated parallel to the base ; assumes , before ...
... sulphuric acid . Pyrophyllite ( Silicate and Hydrate of Alumina ) .- Contains sometimes a little Magnesia or Iron oxides ; is found in right prisms with a rhombic base , cleavable and elongated parallel to the base ; assumes , before ...
Page 36
... sulphuric acid , when reduced to powder ; fuses with intumescence before M M Fig . 19 . the blow - pipe . Hardness 5.5 . Density about 3.5 . Fig . 20 . in ? PART SECOND . CHAPTER I. FELDSPATHIC ROCKS . 1. Granite. 36 DETERMINATION OF ROCKS ...
... sulphuric acid , when reduced to powder ; fuses with intumescence before M M Fig . 19 . the blow - pipe . Hardness 5.5 . Density about 3.5 . Fig . 20 . in ? PART SECOND . CHAPTER I. FELDSPATHIC ROCKS . 1. Granite. 36 DETERMINATION OF ROCKS ...
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Common terms and phrases
Accessory elements Accidental minerals Alumina Amphibole argillaceous attacked by acids Augite Basalts blackish blow-pipe Breccia brown Calc-spar Calcite Calcium carbon cavities cement Chlorite clay cleavage closed tube Cloth colorless compact conchoidal fracture contains crystalline crystals Delesse density Diorite Dolomite earthy easily Edition effervescence enamel Engineers Epidote Eurite exhibits Feldspar fibrous fragments fuses fusible Garnet globule globuliferous Gneiss grains granite granular gray grayish greasy lustre greenish hardness heated hexagonal Hornblende hydrochloric acid Illustrated Infantry infusible insoluble Labradorite laminæ layers less Lime Limestone Magnesia magnetic Magnetite Marl masses Melaphyres Mica Mica Schist Military Naval Oligoclase Oolitic Ordnance Orthoclase oxide of Iron paste pearly Phonolite plates porous Porphyry powder prisms Pumice Pyrites Pyroxene Quartz reddish rhombic base rock sandstone Schist schistose scoriaceous Silica slates sometimes steel point sulphuric acid Talc texture Tourmaline Trachytes TREATISE U. S. Army U. S. Navy varieties vitreous yellow yellowish yields
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