A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 37
... solution chlorates or alkaline sulphates . Mi- ca is made up of laminæ , often hexagonal , brilliant , white or black , rarely of a yellow , gold , or green color ; always easily detached by means of a penknife , in little elastic ...
... solution chlorates or alkaline sulphates . Mi- ca is made up of laminæ , often hexagonal , brilliant , white or black , rarely of a yellow , gold , or green color ; always easily detached by means of a penknife , in little elastic ...
Page 58
... solution , and owe this property , without doubt , to metallic Iron intimately mixed . Varieties ; common Basalt . B. with fragments of Peridot . Peridotite of Cordier . The rock contains an aggregate of polyhedric or rounded grains of ...
... solution , and owe this property , without doubt , to metallic Iron intimately mixed . Varieties ; common Basalt . B. with fragments of Peridot . Peridotite of Cordier . The rock contains an aggregate of polyhedric or rounded grains of ...
Page 81
... the open tube , fuses with difficulty but is decomposed by hydrochloric acid , the solution giving Magnesium reaction . 83. Talcose Schists - An aggregate of laminæ or scales of Talc , with distinct schistose texture , of a 4 *
... the open tube , fuses with difficulty but is decomposed by hydrochloric acid , the solution giving Magnesium reaction . 83. Talcose Schists - An aggregate of laminæ or scales of Talc , with distinct schistose texture , of a 4 *
Page 89
... solutions . It is always anhydrous ; it has a crystalline structure and a density of 2.6 . It is this which forms quartz crystals , agates , and jaspers . second variety contains water ; has a density of 2.2 or more . It is exhibited in ...
... solutions . It is always anhydrous ; it has a crystalline structure and a density of 2.6 . It is this which forms quartz crystals , agates , and jaspers . second variety contains water ; has a density of 2.2 or more . It is exhibited in ...
Page 91
... solutions ; it may be fused with potash . Generally transparent ; sometimes opaque ; conchoidal fracture ; lustre resinous . Iridescent lustre in the opals of Hungary and Mexico . Colors : bright and varied . Hardness , 5 to 6. Density ...
... solutions ; it may be fused with potash . Generally transparent ; sometimes opaque ; conchoidal fracture ; lustre resinous . Iridescent lustre in the opals of Hungary and Mexico . Colors : bright and varied . Hardness , 5 to 6. Density ...
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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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