CATALOGUE OF MINERALS. 13 



System of 

 crystallizatiou. 



233. Tephroite* Mn" gi 2? 



234. Knebelite (f'e,Mn)3§i 



235. Chondrodite* *Mg^"gi 3 

 336. Willemite * Zn^gi 6 



237. Phenacite* Be Si 6 



238. Garnet E^gi + SSi 1 



238^ Pyrope* (Ca, Mg)^ Si4- (XljJ^e) Si 



238b. Grossular* Ca^Si+XlSi 



238'=. Almandine * f'e'Si+Xlgi 



238<i. Spessartine* Mn'Si+^^lgi 



238^ Melanite* Ca^gi + PeSi 



238f. Ouvarovite Ca=' gi + (Sr Xl) gi 



239. Helvin (Mn, Fe)3gi2+Begi + MnS 1 



240. Zircon* ^rgi 2 



241. Auerbachite ZrjSif 2 



242. Alvite? Th?, Y,2r, Pe, Xl, Se,gi,fi 2 



243. Tachyaphaltite Th ?, XI, Pe, 2r, gi, fl 2 



244. Idocrase* (Ca,Mg,Fe)»gi4- SlSi 2 



245. Sarcolite (Ca,Na)='gi4- SlSi 2 

 24i3. Meionite Ca»gi4-2Slgi 2 



247. Scapolite* Ca^ gi^ + 2X1 gi 2 



248. Mellilite 2(Ca,S'a, Slg)'Si4- (Sl,?e) gi 2 



249. Dipyre 4(Ca,Na) gi4- 3Xlgi 2 



* Part of the oxygen is replaced by fluorine in varying proportions. 



