A Guide to the Determination of Rocks: Being an Introduction to Lithology |
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Page 12
... cleavage in the general texture . Such minerals may be considered as dominators . They aid much in determining rocks . It is in this sense that it is neces- sary to extend , by example , these denominations of rocks roxenic , amphibolic ...
... cleavage in the general texture . Such minerals may be considered as dominators . They aid much in determining rocks . It is in this sense that it is neces- sary to extend , by example , these denominations of rocks roxenic , amphibolic ...
Page 17
... in fibrous laminæ , the fibres being parallel to the intersection of the planes which are re- garded as the lateral faces of the rectangular prism . When a lamina is obtained by cleavage from this mineral , the INTRODUCTION . 17.
... in fibrous laminæ , the fibres being parallel to the intersection of the planes which are re- garded as the lateral faces of the rectangular prism . When a lamina is obtained by cleavage from this mineral , the INTRODUCTION . 17.
Page 18
Being an Introduction to Lithology Édouard Jannettaz George Washington Plympton. lamina is obtained by cleavage from this mineral , the obscurity remains only when the general direction of the somewhat dis- continuous fibres is parallel ...
Being an Introduction to Lithology Édouard Jannettaz George Washington Plympton. lamina is obtained by cleavage from this mineral , the obscurity remains only when the general direction of the somewhat dis- continuous fibres is parallel ...
Page 19
... cleavage , present , when observed between two Nicol prisms , al- ternate bands of different colors . III . Another fact of which it is necessary to take cognizance in microscopic analyses , is the dichroism of minerals . Often a ...
... cleavage , present , when observed between two Nicol prisms , al- ternate bands of different colors . III . Another fact of which it is necessary to take cognizance in microscopic analyses , is the dichroism of minerals . Often a ...
Page 21
... cleavage : at first , parallel to p , then to g1 . Dominant forms : elongated in the di- rection of the heights ( Fig . 1 ) ; elongat- ed , also , in the direction of their bases ( Fig . 2 ) . The crystals exhibit many different modes ...
... cleavage : at first , parallel to p , then to g1 . Dominant forms : elongated in the di- rection of the heights ( Fig . 1 ) ; elongat- ed , also , in the direction of their bases ( Fig . 2 ) . The crystals exhibit many different modes ...
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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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