A Summary of Progress in Petrography. in 1887-1896 |
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... clinopinacoid . They often show zonal banding , due to the vari- ations in the optical characteristics of successive layers . The feldspar of the second consolidation occurs in grains , often form- ing the greater part of the ground ...
... clinopinacoid . They often show zonal banding , due to the vari- ations in the optical characteristics of successive layers . The feldspar of the second consolidation occurs in grains , often form- ing the greater part of the ground ...
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... clinopinacoid . Since Rammelsberg has shown that the ortho- rhombic mesolite ( galactite ) is probably natrolite , and since this mineral is found only in orthorhombic crystals , there has as yet been no proof given to show that either ...
... clinopinacoid . Since Rammelsberg has shown that the ortho- rhombic mesolite ( galactite ) is probably natrolite , and since this mineral is found only in orthorhombic crystals , there has as yet been no proof given to show that either ...
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... clinopinacoid , and the acute bisectrix , which is positive , is in the obtuse angle ß , and is inclined 5 ° 54 ′ to the vertical axis . The optical angle VV 12 ° 44 ' for yellow light , and the indices of refraction ẞ = 1.9465 and 7 ...
... clinopinacoid , and the acute bisectrix , which is positive , is in the obtuse angle ß , and is inclined 5 ° 54 ′ to the vertical axis . The optical angle VV 12 ° 44 ' for yellow light , and the indices of refraction ẞ = 1.9465 and 7 ...
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... clinopinacoid . The mineral is strongly pleochroic , ĉ > b > a = red - brown , yellowish - green , and wine - yellow . Its specific gravity is 3.51 , and its composition : Sio2 ZrO2 Fe2O , ( ? ) MnO CaO Na , O Loss at red heat 5.64 5.06 ...
... clinopinacoid . The mineral is strongly pleochroic , ĉ > b > a = red - brown , yellowish - green , and wine - yellow . Its specific gravity is 3.51 , and its composition : Sio2 ZrO2 Fe2O , ( ? ) MnO CaO Na , O Loss at red heat 5.64 5.06 ...
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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