J. D. Dana—Decay of Quartzyte. 57 
or citrenes, C,,H,,, an 
; ess than four of the carbons 
double linked: they must therefore be expressed by a chain 
formula like pentane, C,H,,, and amylene C,H,,. 
_ Refrac- Retrac- 
yaaa weight, Eguiva-| Element. erkeht. | mantras 
lent, lent. 
Aluminium, 27 TT | Manganese in perman- 
Antimony, 120°2 24°1 ganates, 54 about 25 
Arsenic, q 15°4 ercury, 200 19°47? 
rum, 137 15°8 | Nickel, 58 9°9 
Beryllium, 91 5-0 | Nitrogen, 1 41 
smuth, 208 38°2 | Nitrogen in bases,oxides,&e. 14 51 
Boron, in borates, 11 about 4 | Oxygen, single bonds, 16 2°83 
Bromine, 8 15°3 | Oxygen, double bonds, 1 2°4 
Cadmium, 112-131 | Pailadiu 106-216? 
Cesium, 133 19-2 | Phosphorus, 31-183 
Calei 40 10-0 | Platinum 195 24-7 
Carbon, 12 5-0 | Potassium, 39: 7°85 
_Carbon, double linked, 12 6-1 odium, 1043 2362 
Cerium, 141 20-0 | Rubidium, 865 12° 
Chiorine, 35°5 9:9 | Selenium 79 30°5 
Chromium, 621 183. | Silicium, 982 Td 
Chromium in chromates, 52°1 about 22 | Silicium in silicic acid,  28°2 about 6 
, Cobalt, 57 —-10°4_ | Silver, 108 = -:13°2 
Copper, 633 115 | Sodium, a. £e 
Didymium, 145 23:1 | Strontium, 875 «130 
Fluorine, 19 1°6? | Sulphur, 32° «160 
Gold, 1966 23-1 | Sulphur. single bonds, © 32—-14*1 
Hydrogen, 1 13. | Thallium 042 20°4 
ae 1268 245 | Tin, bivalent, 118 27-0? 
on, bivalent, 56 11°6 | Tin, quadrivalent, 118 186? 
— trivalent, 56 =—s-:19-4._ | Titanium, 48 .24°6 
oo 139 23-0 | Uranium, 239 —«:19°6 
uae 207 24:3 | Vanadium, 513-248? 
“Satlew 7 35 | Zine, 6 «98 
ee 24 6"7_| Zirconium, 89-6 212 
anganése, 54.5 
Arr. XIV.—Decay of Quartzyte: Pseudo-breccia ; by JAMES D. 
DaNa. : 
IN the paper on the “Decay of Quartzyte” published in the last 
volume of this Journal, [ 
briefly mentioned the occurrence 
“'ases of quartz crystals coating the surfaces of cavities in the 
iron-colored bands and covering also the limonite in the larger 
Cavities. I said nothin ) 
4 I add here the only fact as yet obtained that 
Seems to bear on the subject. The mass 0 
Bartz deposits. 
g on the origin of these evidently recent 
f quartzyte shows by 
