294 



TABLE 285.— DENSITY OF VARIOUS NATURAL AND ARTIFICIAL MINERALS 



Density in Sp. vol. 



Name and formula "C g/cm 3 cm 3 /g 



Oxides 



Corundum A1 2 3 * (0) 4.02 .249 



LimeCaO* (25) 3.42 .292 



Magnesia MgO * (25) 3.603 .2775 



Ferrous oxide FeO * (20) 5.7 .175 



Hematite Fe 2 3 (20) 5.25 .1905 



Magnetite Fe 3 4 (0) 5.172 .1933 



Quartz Si0 2 t (20) 2.649 .3775 



" * (25) 2.648 .3776 



Cristobalite Si0 2 (25) 2.325 .4301 



Vitreous silica (0) 2.203 .4539 



Rutile Ti0 2 (0) 4.250 .2353 



Ilmenite (FeTi) 2 3 (0) 5.088 .1965 



Silicates 



Sillimanite AUO,- Si0 2 (25 ) 3.247 .3080 



Mullite 3Al 2 3 -2Si0 2 * (25) 3.156 .3169 



Albite NaAlSi 3 0** (25) 2.62 .382 



Anorthite CaAl 2 Si 3 G\* (25) 2.757 .3627 



Nephelite NaAlSiO,* (21 ) 2.619 .3818 



Labradorite Ab«An.-„t (26) 2.695 .3711 



Oligoclase Ab 7 JW (25) 2.638 .3791 



Orthoclase KAlShO. (15) 2.554 .3915 



adularia (15) 2.566 .3897 



Microcline (25) 2.557 .3911 



Calcium orthosilicates 



a-Ca 2 SiO< (25) 3.26 .307 



/3-Ca.SiO, (25) 3.27 .306 



7-Ca 2 SiO« (25) 2.965 .3373 



Calcium metasilicates 



a-CaSi0 3 (+ — Wollastonite)* (25) 2.904 .3444 



/3 — CaSi0 3 (pseudo-Wollastonite) (25) 2.906 .3441 



Diopside CaMgSi 2 0„ (28 ) 3.257 .3070 



CaMgSi 2 2 * (25) 3.265 .3063 



Enstatite MgSiO,* (25) 3.165 .3159 



(MgSiCM*. (FeSi0 3 ) 12 (25) 3.254 .3073 



Hypersthene (MgSi0 3 )T„(FeSi0 3 ) 3 o (29) 3.415 .2928 



Forsterite Mg 2 SiO« (20) 3.223 .3103 



Fayalite Fe 2 SiO,* (15) 4.28 .234 



Garnet— grossularite ( 31 ) 3.544 .2822 



almandite (31) 4.160 .2404 



Jadeite (31) 3.328 .3005 



Miscellaneous substances 



Borax, anhydrous, Na 2 B,0 ; * 2.27 .440 



CaC0 3 ; aragonite (0) 2.932 .3411 



CaCO, ; calcite (20) 2.7102 .3688 



CaF 2 ; fluorite (10) 3.180 .3145 



Diamond (25) 3.516 .2844 



Nad ; rock salt (20) 2.1632 .4623 



Na.SCbV; thenardite * (25) 2.664 .3754 



Na.SOJII* (25) 2.697 .3708 



KC1 : fine powder * (30) 1.984 .5040 



Pvrite FeS, (25) 5.012 .1995 



Marcasite FeS, (25) 4.873 .2052 



* Artificial. t Natural. X Al) = albite; An = Anorthite. 



SMITHSONIAN PHYSICAL TABLES 



