A Summary of Progress in Petrography. in 1887-1896 |
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... hornblende rocks which occur as intrusive sheets and bosses in the limestones and quartzites of the Assynt district in Scotland . From the description which the author gives of them , these rocks appear to be somewhat similar to the ...
... hornblende rocks which occur as intrusive sheets and bosses in the limestones and quartzites of the Assynt district in Scotland . From the description which the author gives of them , these rocks appear to be somewhat similar to the ...
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William Shirley Bayley. growths . In the hornblende porphyrites the hornblende crys- tals are less abundant . This class is characterized by the presence of feldspar in two generations . The porphyritic crystals are sharply outlined ...
William Shirley Bayley. growths . In the hornblende porphyrites the hornblende crys- tals are less abundant . This class is characterized by the presence of feldspar in two generations . The porphyritic crystals are sharply outlined ...
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... hornblende , glaucophane , and dust , a green hornblende , glaucophane both in irregular grains and in well - developed crystals , epidote , mica , and sphene ( leu- coxene ) . In this connection the author describes in some detail the ...
... hornblende , glaucophane , and dust , a green hornblende , glaucophane both in irregular grains and in well - developed crystals , epidote , mica , and sphene ( leu- coxene ) . In this connection the author describes in some detail the ...
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... hornblende take place in such a manner that the axes ɓ and c ' of the former are parallel with c ' and б of the latter . The hornblende in the rock often shows a parting parallel to op . In the Neues Jahrbuch Cathrein describes six ...
... hornblende take place in such a manner that the axes ɓ and c ' of the former are parallel with c ' and б of the latter . The hornblende in the rock often shows a parting parallel to op . In the Neues Jahrbuch Cathrein describes six ...
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Common terms and phrases
acid alteration Amer American Naturalist analysis yielded andesites apatite augite axial ratio basalts calcite calcium carbonate cent chemical cleavage clinopinacoid composition compounds Comptes Rendus constituents contains corresponding County crystallographic described diabase diallage diopside Edited by Dr eral examined Fe,O feldspar forms formula garnet Geol Geological glass glaucophane gneisses grains granite ground-mass H₂O hemimorphic heulandite hexagonal hornblende inclusions intergrown isomorphous Jour K₂O Kryst Madison magma magnesium magnetite manganese meteoric iron meteorites Mexico mica microscope MINERALOGY AND PETROGRAPHY Mitth mixture monoclinic Na,O Na₂O Neues Jahrb norites olivine origin orthoclase orthorhombic parallel Penfield Petrog PETROGRAPHY plagioclase pleochroic porphyritic porphyritic crystals possess potassium prismatic Professor Genth pseudomorphs pyroxene quartz recently refractive regard result rocks rutile Schefferite schists serpentine silicates SiO2 sodium specific gravity specimens structure substance supposed tion topaz tourmaline twinning plane variety W. S. BAYLEY xxxii Zeits