Tables 99-100. IIC 



Table 99. -DENSITIES OF VARIOUS NATURAL AND ARTIFICIAL 



MINERALS. 



(See also Table 97.) 



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 AljSiOj : 



Sillimanite glass 



Sillimanite cryst. 



Forms of MgSiOj : 



i8 Monoclinic pyroxene 



a' Orthorhombic pyroxene 



/3' Monoclinic amphibole 



7' Orthorhombic amphi- 

 bole 



Glass 

 Forms of CaSiOj : 



a (Pseudo-wollastonite) 



/3 (Wollastonite) 



Glass 

 Forms of CajSiO^ : 



a — calcium-orthosilicate 



/3 — " 



7 - " 

 3._ .< 



Lime-alumina compounds : 

 3CaO-Al203 

 5CaO-3Al20s 

 CaO • AIP3 

 3CaO • 5AI3O3 

 3CaO • 5AI2O3, unstable 



form 

 Forms of MgSiOa • CaSiOj : 

 Diopside, natural, cryst. 

 " artificial, " 



" glass 



Density 

 grams 

 per cc. 



3-603 

 3-306 



2.646 

 2.642 

 2.319 

 2.206 



2-53 

 3.022 



3-183 

 3.166 



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 

 3025 



3779. 

 3785 

 4312 



4533 



395 

 3309 



3142 

 3'59 



-3510 

 •3656 



-3444 

 •3441 

 -3454 



-307 

 .306 



■337 



•3301 

 •3546 

 •3365 



-329 



.3069 

 -3063 

 •3514 



Name and Formula. 



Feldspars : 

 Albite glass, NaAlSijOg 



art. 

 Albite cryst., NaAlSijOg 



art. 

 Anorthite glass, 



CaAl2Si208, art. 

 Anorthite cryst., 



CaAl2Si208, art. 

 Soda anorthite, 



NaAlSiO^, art. 

 Borax, glass, Na2B407 



" cryst. " 

 Fluorite, natural, CaFj 



(20°) 

 (NH,)2SO, (30°) 



K,SO, (30°) 



KCl, fine powder (30°) 

 Forms of ZnS : 

 Sphalerite, natural* 

 Wurtzite, artificialt 

 Greenockite, artificial 

 Forms of HgS : 

 Cinnabar, artificial 

 Metacinnabar, artifi- 

 cial 



Minerals : 



Gehlenite, from Velar- 

 den a 



Spurrite, from Velardena, 

 2Ca2SiO, • 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- 



Density 

 grams 

 per cc. 



2-375 

 2597 

 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 100.- DENSITIES OF MOLTEN TIN AND TIN-LEAD EUTECTIC. 



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 Day and Sosman, Geophysical Laboratory, unpublished. 



For further densities inorganic substances see table 219. 

 " " '* organic " " *' 220. 



Smithsonian Tables. 



