= ' f 
228 J. D. Dana on the Isomorphism and 
VI. Cinnabar, Eudialyte. pre 
1. Cinnabar. Hg S—1450  1450-8'1 (sp. gr.) —=180. ©. 180-2990, 
2, Eudialyte. ae oe 
6 Si 346386 6. atoms of acid and bases ¢. ee 3 41. 
1 Zr 113950 A. Siti gr) 2088 : 
1 Fe 45000 B. 2382+-13—183-2 82441581 
24 0a 878-72 
24.Na 977-25 
a. At. weight, 690933 
The relation of 58:90, is nearly as 2:3 (60:90.); of 180 :183°2=1:1 
VIL Borax, Glauber Sait, Pyroxene. 
1. Borax. 
2B = 8724 46. atoms of acid and bases, 13. c. atoms of elements, 30. 
1Na 390°9 A. 2388°1+-1°716==-1391°6 
10 H 11248 B. 1391°6--18=107-0 C. 1391°6-+-30—46'38. 
a. At.weight, 2388-1 
2. Glauber Salt. 
18 = 500 5. atoms of -_ and bases, 12. ¢. atoms af ee 26. 
1Na 3909 A. 2015°7-+1'562 (sp. cea 
10H 11248 3B. 12905+1 A Pa 290° Ace 6 
a, At.weight, 2015-7 
8. Pyroxene—lIst. var. (}0a+4Mg)? Si2. Color white. 
2 Si—~1154-62 %. atoms of acid and bases, 5. ¢. atoms of elements, 14. 
1¢Ca 527-23 A. 2068-60-+-3°24 (sp. Br) =637 
14Mg 381-75 B. 687+5—1274 637+-14—=45'5 
a. pee 2063 
4. Pyroxen aati var. - Get aited 9 Si2. Color green or black. 
2 Fi = 
1} Ca aes A. rine 35-+3°35 (sp. ee 
1 Mg 254: 6 B. 645°2—5==12 ide sessile 1 
Fe 225 ; j 
a. At. weight, 2161: 
5. Pyroxene—8d var. ‘Gcetafoe § Siz. Hedenbergite. 4 
Si 11546 a 
14Ca 527: : A. 2356:85-8°5 (sp. gr.) =673'4 
1} Fe 67500 B, 673451347 CO. 673'4—14—=48'1 
a. At. weight, 2356: 85 
6. Pyroxene—var. Hudson A recent analysis in the Yale Laboratory, New Ha- 
ven, by Mr. W. H. Pawlet gorda nearly the results of Beck for this mineral, but makes 
omranraanaetr De: “> 
* Mr, Brewer ent the following for the composition of the Hudsonite; we Pa 
add also Beck’s resul ‘4 
ain Oxygen. Il. TL. Beck. i 
oo 36°94 19°13 ) ogy 36°06 se78 37°90 
Alum 11-22 5-04 10°47 ee 12°70 
Panieyd of iron, trace trace rere 
otoxyd of iron, = 03 "80 36°57 enuwr ts 36 0 
manganese, 2:24 050 1212 110 ane g 
Lime, 19. 71 3°62 sank ave 
—— ae 
99°14 
Beck Sat We tain oxyd of iron; but we infer from his accompanying 
that he meant protoxyd. hint Soe Brewer; 3°5, Beck. 
10072 
remarks 
