FOR SOLIDS AND LIQUIDS. 



131 



XL. SILICATES* 

 1st. Silicates Containing But One Metal. 



Name. 



Formula. 



Sp. Gravity. 



Authority. 



Sodium metasilicate 

 Phenakite 



ti 



Bertrandite 



ii 



ti 



Enstatite 



it 



" Artificial . 



Forsterite 



<; Boltonite . 



II ii 



II u 



Talc '. 



ii 



Serpentine 



Na 2 Si 3 . 8H,0. 

 Gl 2 Si 4 __.. 



1.G66, 18° 



2.966 \ 



2.996 / 



2.967, 23° 



2.95 



Gl 4 H 2 Si 2 





2.593 

 2.586 

 2.55 . 



Msr Si O 



3.19 



3.10—3.13.. 



3.153 



3.11 . 

 3.243 



3.008 



3.208 

 3.328 

 2.48— 2.80-. 



2.682 



Mg 3 H 4 Si 2 9 



2.Sfi1 



2.644 

 9. fi 



.0? 



2.564—2.593. 

 2.597—2.622. 



F. W. Clarke 

 Kokscharow. 



664. 

 Hillebrand. 



20, U. S. G 

 Hatch. N. J 



171. 

 Bertrand. 



3, 96. 

 Dam our. 



6, 252. 

 Scharizer. 



14, 41. 

 Damour. 



Min. 

 Kenngott. 

 Broggerand\ 



Z. K. M. 1, 

 Hautefeuille. 



212. 

 Rammelsberg. 



757. 

 Silliman, Jr. 



742. 



J. 10, 



Bull. 



. S. 

 . 1888, 



S. M. 



S. M. 



K. M. 



ana's 



8, 928. 

 Rath. 

 22. 

 J.17, 



J. 13, 



J. 2, 



Smith. J. 7, 821. 



Scheerer. J. 4, 793. 

 Senft. Z. G. S. 14, 



107. 

 Rammelsberg. J. 1, 



1195. 

 Delessc. J. 1, 1195. 

 Hermann. J. 2, 764. 

 Gilm. J. 10, 678. 

 Hunt. J. 11, 715. 



* For sp. gr. of silicates before and after fusion see v. Kobell, Bei. G, 314. 



Note. — As regards the natural silicates this table is for from complete. Only those 

 compounds are included which admit of fairly definite chemical formulation, and only 

 a few typical determinations of specific gravity are given in each case. Furthermore, 

 the arrangement is absolutely chemical, and is in no sense dependent upon mineralog- 

 ical considerations. Thus, for example, all the magnesium silicates are brought to- 

 gether ; and so also are the numerous double silicates of aluminum and calcium, quite 

 regardless of their classification as mineral species. Many micas, chlorites, scapolites, 

 etc., are omitted altogether; but the omissions are not serious, for all the important 

 data have been many times collected in the larger treatises on mineralogy, and are, 

 therefore, easily accessible. 



