A Summary of Progress in Petrography. in 1887-1896 |
From inside the book
Results 1-5 of 8
Page 13
... sodium sulphate on the same mineral produced little prismatic crystals of a substance differing from nosean in the addition of two molecules of water . 13 Physical Mineralogy . - The discussion as to the cause of optical anomalies in ...
... sodium sulphate on the same mineral produced little prismatic crystals of a substance differing from nosean in the addition of two molecules of water . 13 Physical Mineralogy . - The discussion as to the cause of optical anomalies in ...
Page 14
... sodium in nosean . Lapis - lazuli , or natural ultramarine , is a mixture of several minerals , of which one is bright blue . The authors have isolated this and found it to contain : Sio , Al , 03 CaO Na , O K , O SO , S CI 32.52 27.61 ...
... sodium in nosean . Lapis - lazuli , or natural ultramarine , is a mixture of several minerals , of which one is bright blue . The authors have isolated this and found it to contain : Sio , Al , 03 CaO Na , O K , O SO , S CI 32.52 27.61 ...
Page 17
... sodium , and calcium . The mineral differs from ptilolite in containing more water . In crystallization it is monoclinic , and is isomorphous with heulandite . Its habit resembles that of beaumontite . a : b : c.4010 : 1 : .4262 , 88 ...
... sodium , and calcium . The mineral differs from ptilolite in containing more water . In crystallization it is monoclinic , and is isomorphous with heulandite . Its habit resembles that of beaumontite . a : b : c.4010 : 1 : .4262 , 88 ...
Page 18
... sodium light , a = 1.5224 , 91.5264 , 7 = 1.5295 . The optical angle is 2V 83 ° 41 ' .- A pure white zine sulphide is mentioned by Mr. Robertson as occurring at Galena , Cherokee Co. , Kansas . It is associated with sphalerite , and is ...
... sodium light , a = 1.5224 , 91.5264 , 7 = 1.5295 . The optical angle is 2V 83 ° 41 ' .- A pure white zine sulphide is mentioned by Mr. Robertson as occurring at Galena , Cherokee Co. , Kansas . It is associated with sphalerite , and is ...
Page 19
... sodium light vibrating parallel to A is 1.354 . The other optical properties coincide with those de- termined by Milch . Prof. Groth suggests that neither of the two names suggested for the mineral be accepted until it is found which ...
... sodium light vibrating parallel to A is 1.354 . The other optical properties coincide with those de- termined by Milch . Prof. Groth suggests that neither of the two names suggested for the mineral be accepted until it is found which ...
Other editions - View all
Common terms and phrases
acid Al,O alteration Amer AMERICAN NATURALIST analysis andalusite angle aragonite augite axial ratio basalts beryl biotite brucite Bull calcite calcium chlorite cleavage Colby University color colorless composition constituents containing cordierite corresponding crystalline crystals density described diabase double refraction dyke eruptive rocks Fe,O Fe₂O feldspar FeO MgO CaO FeO MnO forms formula Franc gabbro-diorites gabbros garnet Genth gneisses granite granulites ground-mass H₂O habit hexagonal hornblende humite hypersthene imbedded inclusions Jour Kryst leucite masses melanophlogite metacinnabarite mica mineral MINERALOGY AND PETROGRAPHY.¹ Mitth molecules muscovite Neues Jahrb nosean occur olivine optical original orthoclase ottrelite parallel Penfield Petrog PETROGRAPHY.¹ Petrographical phenacite plagioclase plane plates polymorphism prismatic produced pseudomorphs pyroxene quartz regarded rock individual Rosenbusch schistose schists serpentine silica sodium soluble specific gravity specimens spinel structure substance sulphur symmetry tabular temperature tonalite tourmaline twinned varieties W. S. Bayley Waterville yielded Zeits zircon zone
Popular passages
Page 19 - The plane of the optical axes is perpendicular to the plane of symmetry, and makes with c an angle of °7 in acute /9. A = b. 2H na = 104° 27'.
Page 14 - The larger part of the dust is thought to be a sediment from the air, and to have been obtained by it from a region of crystalline schists. The chondri, on the other hand, are thought to be of cosmic origin, since they are similar to the chondri obtained in deep-sea soundings. If the amount of the dust collected from the snow in Greenland represents the fall of one year, the total amount falling upon the entire surface of the earth in this time is 125 million kilograms, equivalent to a cube of thirty-one...
Page 14 - Wiilfing 21 for investigation, by whom it has been found to consist in greater part of feldspar, quartz, mica, and hornblende. There are present in it also garnet, zircon, magnetite, augite, and sillimanite, and with them is mixed a nitrogenous organic substance. The most interesting constituents of the dust...