A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 15
... the same degree of fine- ness , subjecting them also to the action of acids , blow - pipe magnet , etc. M. Ad . Brongniart has examined directly with the micro- scope , the thin laminæ cut from petrified wood . INTRODUCTION . 15.
... the same degree of fine- ness , subjecting them also to the action of acids , blow - pipe magnet , etc. M. Ad . Brongniart has examined directly with the micro- scope , the thin laminæ cut from petrified wood . INTRODUCTION . 15.
Page 22
... acids , except hydrofluoric and ammonium fluoride . It contains from 64 to 67 % of Silica . Varieties : Adularia , colorless and nearly transparent ; Ama- zon - stone , green or greenish - blue ,. 22 22 DETERMINATION OF ROCKS .
... acids , except hydrofluoric and ammonium fluoride . It contains from 64 to 67 % of Silica . Varieties : Adularia , colorless and nearly transparent ; Ama- zon - stone , green or greenish - blue ,. 22 22 DETERMINATION OF ROCKS .
Page 24
... acid of the air . Labradorite ( Aluminum - calcium - sodium , Silicates ) .- Form : doubly oblique prism . Crystals ... acid even when in powder . Concentrated sulphuric acid dissolves it with a separation of Silica . It Saussurite is ...
... acid of the air . Labradorite ( Aluminum - calcium - sodium , Silicates ) .- Form : doubly oblique prism . Crystals ... acid even when in powder . Concentrated sulphuric acid dissolves it with a separation of Silica . It Saussurite is ...
Page 25
... acid , with separation of Silica . MINERALS ALLIED TO THE FELDSPARS . 1. Nepheline ( Aluminum - sodium - potassium ... acids with a gelatinous deposit of Silica . Elæolite . - Possesses external — P b b P M M M Fig . 5 . characters ...
... acid , with separation of Silica . MINERALS ALLIED TO THE FELDSPARS . 1. Nepheline ( Aluminum - sodium - potassium ... acids with a gelatinous deposit of Silica . Elæolite . - Possesses external — P b b P M M M Fig . 5 . characters ...
Page 26
... acids . Hardness 5.5 . Specific gravity 2.29 . Form : dodecahedron , generally elongated in the direction of one of the octahedral axes . Cleavages par- allel to the faces of the dodecahedron . 4. Hauyne ( Composition same as preceding ...
... acids . Hardness 5.5 . Specific gravity 2.29 . Form : dodecahedron , generally elongated in the direction of one of the octahedral axes . Cleavages par- allel to the faces of the dodecahedron . 4. Hauyne ( Composition same as preceding ...
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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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