a. of some Minerals. 229 
the i iron peotoxyd, with but a trace of — It affords very closely the formula 
* ' 35 3 (6°33 1°66 Z 
Ro Gi, 2, or more precisely (= fet Mn += ; Ga) bees Bie x1) 
’M x by 4 throughout, the relation “ial RE ae * eda 
which w e adopt, without farther reducing it, as the result will be 
8. ey Si 36563 4. atomsof acids and bases, 20. ¢. atoms of cae 57}. 
; 1341 10696 =A. 97'78:-4--3-463 (mean sp. Ary and 2824-4706 
| 8 Fe 36000 B. 2824+20=141:2 C. 2824+573—=48-9 
4Mn 299°3 
84 Ca 12302 
a, At. weight, 97784 \ 
7. Pyroxene—var. Fe3 §i2, Asbestiform, analyzed by Griiner, (Comp. Rend. xxiv, 794.) 
e ==1850 b. atoms of acid and bases, 5. ¢. pipet we element 14. 
2Si 1154-62 A. 2504°62+-3-712 (sp. gr.) =674 
a. At. weight, 250462 B. 674-°7-+5=135 C. 674-7--14=48-2 
8. Pyroxene—var. Mns Siz, Manganese S 
38 Mn =13341 6. atoms of acid and base, 5. c. atoms of ee 14, 
28i 115462 A. 2488°72-3'634 (sp. gr.) =684 
a. At.weight, 248872 B. 6848-51369 C. 684°8-—-14=48'9 
VIL. Anatase, Horn Quicksilver. 
1. Anatase. Ti 514-7+3°84 (sp. periate C. 1340-34466 
2. Horn Quicksilver, Hg Cl, 16933648 (sp. gr.) =261'3 C. 261:3+2—=130°62 
130°62 : 44-66, nearly as 3:1; and 130-62: fae. (nearly) 1:1. 
IX. eg Selenium (acknowledged isomorph with Sulphur), Scorodite. 
1. Sulphur. S, 200+2-088 (sp. gr.) —98'4 
2. Selenium. Se, 495°3—4°3 (sp. gr.) 115 
3. Scorodite, 
1 As —1440-:08 4. atoms of acid and bases, 6. c. atoms of elements, 19. 
1¥#e 1000-00 A. 2890+3'23 (sp. gr.) 804 13 
4H 44992 B. 894-°73—6—~149'12 CO. 894°73+19—=47'1 
a. At. weight, 2890-00 
47-1, is very nearly $ the atomic volume of Sulphur; and 149: 9843: 2 
| X. Celestine, White Iron Pyrites, Graphic Tellurium, 
I 1, Celestine, 
1 = 500°  }. atoms of acid and base, 2. ¢. atoms of elements, 6. 
| 1 Sr 647°3 A. 11473+3°9 (sp. gr.) 294-2 
' a. oy —- uae B, 294:2—-2—=147'1 O. 2942—6=—49'0 
7 Hable A. 150476 (sp. gr.J—=15756 — C. 15756-35252 
: 8. Graphic Tellurium. __ 
e =—=5612'6 atoms * elements, 10. 
LAg 1350: A. 9418-18-28 (sp. = 75 
29Au 2455-5 1137 ee 75 
: @. At. weight, “94181 
The atomic Poury C of se papaie Tellurium is consequently double of that of White 
