SiPplement to Dana's Mineralogy. 367 
Piumpocarctre [p.4 88].--Von Haver obtained in an analysis of plumbocalcite 
from Leadhills, Scotland, 92°48 carbonate of lime and 7-74 carbonate of lead =. 
“ale Gi =2-772 ; H.==3°0, White to pale reddish-white, Kenngott’s Min. Not., 
Potrtattre [p. nia -—H. Rose states (Pogg. Ann., xciii, 1) that according to an 
examination of the mineral from Vic i “A —— (that a renee by Berthier) ~~ “a 
Dexter, the gray variate as well as - pre of polyhalite, mixed with 
hydrous silicate of magnesia and alum analysis = the vols halite of Hallein 
by Behnke, and of that of Aussee Br Mn Dest afford 
NaS NaCl iat 
G 
1, 42°29 18°27 27-09 2:60 .,.. 2°38 sth. 610= 
2. 45:62 1897 28-39 061 O81 032 6°02 Mg0 5 o Bs 0- a 97,D.: 
Analysis 1, contains also 1-35 p. ¢. of basic a of sesquoxyd of iro 
we [p. 502].—Scheerer in Poggendorff’s Annalen, xcii, has made 
some additions to ‘his observations on scales but withoat any pear Sn analysis. 
A somewhat similar mineral from Schlackenwald is described. 
Pyrropuyzuire [p. 303]. —Analysis by Dr. F. A. Genth, of pyrophyllite from Crow- 
der’s Mtn., N. Carolina, in Am. J. Sci, [2], xviii, 410. The e analyses lead to the form- 
ula Al? Sis +271. 
Prrrres ths ].—Specific gravity of 52 crystals, according to von Zeparvih 
between 3” tra aud 5°185, the lowest, of crystals ae aed altered to limonite: pol- 
ished crystals 4-8-5-185. Kenngott’s Min. Not., No. 
PYRORETIN, Reuss.—Pyroretin is a new fossil resin from the Brown Coal forma- 
tion near Aussig in Bohemia, described by A. E. Reuss Sg ada xii, Hh BS It occurs 
in cream sometimes an inch thick and in nodules; is brittle; + Breasy 
resinous in lustre; hardness of gypsum ; streaky ode wader ‘al Sh aia 
easily with a reddish yellow flame and a e burning am amber, leaving a black 
coaly re sidue. Heated, it blackens and srils poets and begins to intumesce from 
incipient deco: omposition, and on cooling forms a black asphal Foe teas mass. Begins 
Rs melt at 100° ©, and if kept at this temperature gives off oxygen. Analysis by 
Stanék; 
Carbon 80°02 Hydrogen 9°42 Oxygen 10: 056 
crrerpond San nino, o Hes Oy: It is near the Beta of the Pin 
‘dn to Johnson, which ga a e Oy, a 9 Os, diferng g ely by 1 atom of 
ices S geaeen Soak ses Se depenith ed again on 
[p- a —Analysis of augite from Sasbach, ve ‘% Tobler, Keo Ch. 
wa 
ne Fe «* Ga Mg Na K H 
44-40 783 1181 oil 2260 1015 218 065 103 = 10072 
rye, 23:52 365 262 002 646 392 055 O11 9 
Tf the alumina meee silica, the formula is that of augite, the oxygen ratio 
being 1368 : 27°37 = 1: 
_ Uther new analyses, Lieb. u. Kopp. vanes 1853, 797. ~ 
Kenngott has observed the prism o~$ in a diopside from Schwarzenstein in the 
Tyrol, (Min. Not., No. 13.) This mineralogist has reviewed in the same paper 
ses of ne wi > alumina. 
Rooxs.—A on the original a of some gard rocks, 
Speco sbagrame published in the Halle “Zeitschr. fiir die gesammten Naturwissen- 
maf, Sept 1864, iv, 194, 
a acneti site monet ame Sow! by Ir. 2. 
Soe ipiel ght The Rm obpnd id te at 
instead = 36°36, 63°64, A ulphur 35°67, 
‘ro pier esses ntact G.=475. Am. 
ae azotend 
Rate sa Oenehlons 
