THE CHEMICAL ARRANGEMENT. 313 



(Quaternary.) 



*Ferrous, alurainic, sodic &; calcic Saussurite. 



* Aluminic, calcic, ferrous &; eerie Mlanite. 



* Aluminic, potassic, ferrous & 



lithic Mica. 



*Magnesic, calcic, aluminic &; 



ferrous (or manganous) Hornblende. 



^Calcic, aluminic, ferrous & 



manganous Garnet. 



Axinite. 



APPENDIX TO GENUS XII. 

 (Combination of a silicate with a fluoride.) 

 *Aluminic silicate & fluoride Topaz. 



*Magnesic silicate &; fluoride Brucite. 



(Combination of a silicate with a chloride.) 

 *Ferrous Sc manganous silicate 



& ferric chloride Pyrosmallte. 



(Combination of a silicate with a borate ) 



* Aluminic, ferrous (or manga- 



nous) & potassic (or sodic, 



lithic or magnesic) Tourmaline. 



(Combination of a silicate with a carbonate.) 



*Bismuthic Bismuth Blende. 



(Combination of a silicate with a titanate.) 



*Calcic Sphene. 



VOL. ii. 27 



