SuPplement to Dana'syMineralogy. 365 
mediate between it and orthoclase and albite, one of which he calls oligoclase-albite 
and pa other Gaara 
Orpivenr [p. 32, ]—Kenngott opens xi, 982) opposes the view of G. IL oO. 
Volger, that peas is in general a result of the alteration of realgar 
OzocerirE [p. og —P. G. Hofstadter in Ann, Ch. u. Pharm., xci, 326, on natural 
and artificial par 
a , tabdines Pogg. Ann., xciii, 95. 
PALAGonIre 4 i —Observations on palagonite, by Scheerer, Handw, Chem. 
re: Pogg., ce. 
ARTSCHIN -m sr) Dein of a yy from Ohlapian, by W. Haidinger 
inna xii, 480) :—Mon + G==To7* Fundamental ‘pistes F=01” be 
agonal prism of 116 oor The genes without lustre, and measurements y 
aa maps Cleavage ine 
=6'5-7. G.=4:006 : oak Lustre weak greasy, Slightly subirans- 
lucent. Composition scoring to C. ¥. Hauer: 
F 
i H 
a. 85°28 ibs 14°38 29°1 1°82 ) 0-38 = 100 
whence, as _y. Hauer a it has the garnet oxygen ratio, 1:1:2, and garn 
formula. mapper arks it we mineral as dimorphous wie garnet, yon 
especially with the . abn spessartin 
e oxygen ratio of partschin is ‘the same amc ree : a which species 
too, is dimorphous with garnet. Moreover the fi that of allanite ; 
and eo ek it is in all pr — a daily oalntend Ssoeenht “The angle 127° 44’ 
n allanite : 
correspon Be = 128° the rete 91° 52’ is rte clinodome 3, 
which would be 93° 4 in allanite large as 
ved appear, when it is x flovbs that the faces are ron 
Putogortre [p. 224]—Kenngott endeavors to show in sg fe ae a 13, (1) 
that the mineral called phlogopite by Shepard and Dana i htt t Breitha t’s phlogo- 
pite ; and mee that it is not ee Be biaxial. ape the jirst pant he one thet the 
eralhe raat) a, aeaiaes'8 his of ti i 
the nees are the same as for “| ‘biotite sage Greenwood Furnace, “and hence 
the e oheerved are onl paeatge 
[These are both errors. The s specimen of phlogopite < a Breithaupt institu- 
ted the speties was sent him ey Prof. Shepard, a0 and Prof. Shepard receiv soon af- 
ter a letter mentioning that he had so named it.* Hence ok was not ig- 
Picea the mineral or its " aality, nor were other American to 
‘familiar. 
angle at 120° to 121° 15, while Breithaupt said 121° 15’, it he had 
found 120° the angle from Sadar Spealnoest wiaiisdanighatlctedidiowea ot the 
* Nore sy Bert Sriumay, Jn—As M. soap aiterd oy eon a doubt as to the 
Correctness of ur recognition f —inasmuch 
88 he asserts tl a ee PisShepards and Daria’s works 
on Mineral bs > ieakiause dade a eguenwaitce & given 
Mica from Entec erp, N. Y., “it is well for me to state in the absence of Prof. Shep- 
dge 
ard, that first know rica of Breithaupt's species pite 
from a letter wri a te tno i to Proi, Shepard, and which I had 
pie Pleasure of reading. In that letter he first ys ie toa ee yel- 
from N, : 
1 serpenti specimen of which had sent to him not long be- 
fore. ‘portion of thi same apesinen Is in Pot. Sh er apecineds o at the time 
alluded to, and from entire similarity to other known specimens of the riage 
and those me ale 
there cre Fav ce ‘emnallest donbt of our correctness. ** a: ad, that all the wi 
as from that of Northern New York, which I ha and examined 
with reference characters, belong to the piles ‘gMigopite with an- 
‘les from 7° to 17° Se nea a 
