118 Fourth Supplement to Dana^s Mineralogy. 







Si 



Si 



J'e 



Ca 



M^ 









1. 



Saualpe, 



41-51 



28-90 



398 



24-78 



0-58 ■ = 



=99-75, 



G.= 



=3-353 



2. 



Ficlitelgebir/^e, 



41-18 



30-40 



2-83 



2487 



0-25 = 



=99-53, 



G.= 



= 3-361 



8. 



Goshen, Mass. 



40 98 



31-38 



2-61 



24-46 



0*50 = 



-99-83, 



G.= 



=3-341 



4. 



Sterling, 



40-82 



30 97 



211 



24-65 



0-24 = 



=98-79, 



6.= 



-3-352 



5. 



Thai Fusch. 



43-52 



2819 



3-05 



23-60 



1-26 = 



=99-62, 



G.= 



=3 251 



6. 



Monte Rosa, 



43-74 



29-23 



3-18 



22-31 



0-59, K 0*93= 



=99-98. 



G.= 



=3-280 



The above in each case, the mean of two analyses, after excluding the moisture driven 

 off by Ignition. Amount of this moisture in 1, 2 09 p. c; 2, 2-08 ; 3, 2-25 ; 6. 3 67 ; 

 •, 3 18. Oxygen ratio for it, K, Si, very nearly 1:2:3, agreeing -with epidote, and 



giving the formula, Ca^ Si+ 23cl Si. 



A mangan-epidote from St. Marcel, analyzed by Deville, afforded ; 



Si SI 3Pe Stn Ca % 



37-3 16-9 4-8 190 22*8 02 = 100 



giving the oxygen ratio for R, 33, Si 6'59 : 1454 : 19'3 = 1:2:3. 



EnsTiLBiTE [p. 330]. — The Berufiord crystals gave von Waltershausen (Pogg. xcix, 



171), li:li(top) = 100^ 13', /: 7=135° 34'; 22:22 (adjacent over brachyi 

 pyramidal edge) 117^ 30'. 



According to an analysis by C. A. Kurlbaum, Jr., the Iceland epistilbite contains 

 (Am. J. Sci. [2], xxiil, 421) : 



Si 58-74 a 17*10 Pe 0"12 Ca 7-81 STa 2*05 K 0-19 fl 14-21 = 100'23 



EuDiALYTE [p. 181].— Daraour refers EukoVite to Eudialyte. The following are the 

 mean results of his analyses of these two minerals (L^Institut, No. 1201, Jan. 1857): 



-i Ta ^r Fe Oa IVIn ]5ra CI ign. 

 L Eudialyte, 50*38 0-35 15-60 6-37 923 1-61 13-10 1-48 l-25=99-37 



2. Eukolite, 4570 235 1422 683 9-66 235 11-59 I'll 1*83 jf^i'^i' 



No. 1 gives for the oxygen ratio of fe, B, Si (inch Ta) 7'75 : 410 : 26-20 =2 : 1 : 6, 

 while No. 2 gives 7-92 : 4*14 : 2399 =2:1:6. 



FARoELITE, Heddle. — The zeolite called meaole (a name too near m.f,W27tf), is 

 named Faroelite by Dr. Heddle, and regarded as a distinct species (Fliil. Ma^*. [4], 

 xiii, 53). It occurs associated with mesohte, but is still always distinct from it, being 

 in implanted and isolated globules or hemispheres, sometimes overlaid but never 

 underlaid by the mesolite. The color is usually bluish white and the lustre decidedly 

 pearly, not glassy like the mesolite. It is found at Storr and other places in Skye. 



Analyses by Dr. Heddle : 





gi 



Si 



Ca 



S^a 



S 





1. storr, 



41-32 



23-44 



11-54 



5-77 



13-26 = 



= 100-33 



2- Portree, 



41-20 



30-00 



11-40 



4-38 



13 20 = 



= 100-18 



8. TJig, 



43-17 



29-30 



9-82 



5-33 



12-40 = 



= 100-02 



The formula which has been written for mesole [see Min. p. 328] corresponds to the 

 oxygen ratio 1 : 3 : 5 : f (ratio deduced by Berzelius), and this is derived by Dr. 

 Heddle from his analyses. In the analyses of the mesole of Annaklef by Hisijiger 

 and that of Bombay by Thomson, ift = 4Ca 4-^^?' ; while in that of Faroe accord* 

 ing to the analyses of Berzelius and Dr. Heddle, IR =3Ca-|-J-;5j'a. The percentnge 

 corresponding to the formula is, Silica 42-45, alumina 28-27, lime 1029, soda 6'75, 

 water 13 24. 



[Tlie Ilauenstein zeolite, mentioned in Min. p. 328, under Mesole, is stated by 

 Haidinger (as Dr. Heddle observes) to be natrolite coated with comptonito. (See 

 Haidinger's Hnndbuch, p. 529.) Haidinger on the same page refers mesole to Tiiom- 

 Bonite. Berzelius writes for mesole, (from the ratio 1 : 3 : 5 : |,) the fornmla 



[Jfa' Si^ 3SiSi + 6B] +2[Ca« Si^ 3*1 §i + 9ft]. 



The second analysis above by Dr. Heddle corresponds rather better with the ratio, 

 1 : 3 : 4J : 2^ (that of a hydrous nepheliue) =^2 gi -f o^l gi -f sfl (in which 2ft 



