A Summary of Progress in Petrography. in 1887-1896 |
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Page 1902
... O , FeO CaO MgO Na , O H2O Darker var . 51.36 4.14 2.17 10.04 11.91 17.14 1.86 1.38 Lighter var . 51.82 4.17 2.34 9.84 12.18 17.18 1.34 1.13 Many of the other rocks described present interesting features , but none of great ...
... O , FeO CaO MgO Na , O H2O Darker var . 51.36 4.14 2.17 10.04 11.91 17.14 1.86 1.38 Lighter var . 51.82 4.17 2.34 9.84 12.18 17.18 1.34 1.13 Many of the other rocks described present interesting features , but none of great ...
Page 1
... Na , O Loss 1.94 .62 2.99 4.12 1.08 tr . In his description of the section Tanneberg of the geological map of Saxony , Dalmer7 mentions two rocks of some interest . The first is a sericite - gneiss , composed of quartz , plagioclase and ...
... Na , O Loss 1.94 .62 2.99 4.12 1.08 tr . In his description of the section Tanneberg of the geological map of Saxony , Dalmer7 mentions two rocks of some interest . The first is a sericite - gneiss , composed of quartz , plagioclase and ...
Page 9
... O , FeO CaO MgO K , O Na , O Loss Sp . Gr . 1.6 2 ( 1 ) 70.8 15.1 16.8 I.O .6 .2 I. I 9. I 2.606 .8 .9 2.I 4.7 1.5 2.606 .8 6.1 2.7 ( 2 ) 71.2 .8 1.5 ( 3 ) 70.6 15.3 .7 1.7 .8 .9 2.645 -Wethered has examined the Jurassic pisolite of ...
... O , FeO CaO MgO K , O Na , O Loss Sp . Gr . 1.6 2 ( 1 ) 70.8 15.1 16.8 I.O .6 .2 I. I 9. I 2.606 .8 .9 2.I 4.7 1.5 2.606 .8 6.1 2.7 ( 2 ) 71.2 .8 1.5 ( 3 ) 70.6 15.3 .7 1.7 .8 .9 2.645 -Wethered has examined the Jurassic pisolite of ...
Page 11
... Na , O Li2O 41.03 38.19 3.06 16.79 .19 essentially NaMnPO ,. The new mineral is regarded as but another one of the ... O , Fe , O , La , O ,. ( DiCE ) , O , MnO CaO Na , O Loss 31.53 18.69 6.07 1.31 1.15 2.38 1.85 25.38 10.15 .20 ...
... Na , O Li2O 41.03 38.19 3.06 16.79 .19 essentially NaMnPO ,. The new mineral is regarded as but another one of the ... O , Fe , O , La , O ,. ( DiCE ) , O , MnO CaO Na , O Loss 31.53 18.69 6.07 1.31 1.15 2.38 1.85 25.38 10.15 .20 ...
Page
... [ Na , ( F Be ) , Ca , ( SiO , ) , ] in containing more beryllium [ i . e . it is Na , ( FBe ) , ( Ca , O ) , Be , ( SiO , ) ] . A thor- ough discussion of the characteristics of acmite and ægerine leads to the view that they are well ...
... [ Na , ( F Be ) , Ca , ( SiO , ) , ] in containing more beryllium [ i . e . it is Na , ( FBe ) , ( Ca , O ) , Be , ( SiO , ) ] . A thor- ough discussion of the characteristics of acmite and ægerine leads to the view that they are well ...
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Common terms and phrases
acute bisectrix Al,O Amer AMERICAN NATURALIST amphibole analysis andesites apatite augite axial ratio basalt biotite bisectrix brown Bull calcite Colby University color colorless composition containing cordierite corresponding described diabase diorites double refraction dykes Edited by Dr epidote eruptive Fe,O feldspar FeO CaO MgO FeO MnO Förh formula gabbro garnet Geol gneiss grains granite green ground-mass H₂O hardness hexagonal hornblende inclusions isomorphous Jour Kryst Lacroix lamellæ lithophysæ lustre magma magnetite MAKERS SYRACUSE manganese mica microlites mineral occurs MINERALOGY AND PETROGRAPHY.¹ molecule monoclinic Na,O Na₂O nepheline Neues Jahrb olivine optical angle optical axes original orthoclase orthorhombic Petrog PETROGRAPHY.¹ Petrographical phenocrysts plagioclase pleochroic porphyritic porphyritic crystals pressure prismatic produced pyroxene quartz regarded resembles rhombohedral rocks scapolite schists silica small crystals specific gravity spherulites structure substance symmetry thin section tion twinning plane variety W. S. Bayley Waterville yellow yielded Zeits
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Page 5 - The olivine is surrounded by a reactionary rim consisting of an inner zone of hypersthene and an outer one of actinolite.