88 Tables 64-65. 



Table 64.-DENSITIES OF VARIOUS NATURAL AND ARTIFICIAL 



MINERALS. 



(See also Table 62.) 



Name and Formula. 



Pure compounds, all at 

 25°C 



Magnesia, MgO 



Lime, CaO 



Forms of SiOj: 



Quartz, natural 

 " artificial 



Cristobalite, artificial 



Silica glass 



Forms of AUSiOj : 



Sillimanite glass 



Sillimanite cryst. 



Forms of MgSiOj : 



j8 Monoclinic pyroxene 



a Orthorhombic pyroxene 



/3' Monoclinic amphibole 



7' Orthorhombic amphi- 

 bole 



Glass 



Forms of CaSiOj : 



a (Pseudo-wollastonite) 



j3 (Wollastonite) 



Glass 

 Fonns of Ca^SiO^ : 



a — calcium-orthosilicate 



3 — " 



y — " 

 ^.'— " 



Lime-alumina compounds : 

 3CaO • AI2O3 

 5CaO-3Al,C), 

 CaO • Al,03 

 3CaO • 5AI2O3 

 3CaO • 5AI2O3, unstable 



form 

 Forms of MgSiOg • CaSiOj : 

 Diopside, natural, cryst. 

 " artificial, " 



" glass 



Density 

 grams 

 per cc. 



3603 

 3-306 



2.646 

 2.642 

 2.319 

 2.206 



2-53 

 3.022 



3-183 

 3.166 



2.849 

 2-735 



2.904 

 2.906 

 2.895 



3-26 

 3-27 

 2.965 



3.029 

 2.820 

 2.972 



3-04 



3-258 

 3.265 

 2.846 



Sp.Vol. 

 cc. per 

 gram. 



•2775 I 

 •3025 



•3779 

 •3785 

 .4312 



•4533 



•395 

 •3309 



.3142 

 •3 '59 



•3510 

 .3656 



-3444 

 •3441 

 •3454 



Name and Formula. 



Feldspars : 

 Albite glass, NaAlSijOg, 



art. 

 Albite cryst., NaAlSijOj 



art. 

 Anorthite glass, 



CaAljSijOg, art. 

 Anorthite cryst., 



CaAl2Si208, art. 

 Soda anorthite, 



NaAlSi04, art. 

 Borax, glass, NajB^O, 



" cryst. " 

 Fluorite, natural, CaF2 



(20°) 

 (NH,)2SO, (30°) 



K3SO, (30°) 



KCl, fine powder (30°) 

 Forms of ZnS : 

 Sphalerite, natural* 

 Wurtzite, artificial! 

 Greenockite, artificial 

 Forms of HgS : 

 Cinnabar, artificial 

 Metacinnabar, artifi- 

 cial 



Minerals : 



Gehlenite, from Velar- 

 dena 



Spurrite, from Velardena, 

 2Ca2Si04 • CaCOa 



Hillebrandite, from Vel- 

 ardena, 



CaSi03-Ca(OH)2 



Pyrite, natural, FeS^ 



Marcasite, natural, FeSj 



* Only 0.15% Fe total impurity, 

 t Same composition as Sphaler- 

 ite. 



Density 

 grams 

 per cc. 



2-375 

 2.597 

 2.692 



2-757 



2-563 



2.36 



2.27 



3.180 

 1-765 

 2.657 

 1.984 



4.090 

 4.087 

 4.820 



8.176 



7.58 



3-03 

 3-005 



2.684 

 5.012 

 4-873 



Sp. Vol. 

 cc. per 

 gram. 



.4210 



•3851 

 •3715 

 .3627 



.3902 



•423 

 .440 



•3145 

 .5666 



•3764 

 .5040 



.2444 



.2447 

 .2075 



.1223 



.132 



-330 

 .3328 



-3726 



-1995 

 .2052 



References: i, Larsen 1909; 2, Day and Shepherd; 3, Shepherd and Rankin, 1909; 4, Allen and 

 White, 1909; 5, Allen, Wright and Clement, 1906; 6, Day and Allen, 1905; 7, Washington and 

 Wright, 1910; 8, Merwin, 1911 ; 9, Johnston and Adams, 1911; 10, Allen and Crenshaw, 1912; 

 II, Wright, 1908. 



All the data of this table are from the Geophysical Laboratory, Washington. 



Table 65. -DENSITIES OF MOLTEN TIN AND TIN-LEAD EUTECTIC. 



* Melts at 181. Day and Sosman, Geophysical Laboratory, unpublished. 



For further densities inorganic substances see table 238. 

 organic " " " 244. 



Smithsonian Tables. 



