140 Seventh Supplement to Dana’s Mineralogy. 
aphical error in the statement of the silica of between 4 and 5 —_ [The 
mineral is said to occur with : Fhe of nickel (see rater ne but the check 
instead of allowing part of t oxts 0 of nickel to be ned with the 350 of 
phosphoric ong arsenic acids "Cabich ight take up 2 sae nt), and part of ‘the 
silica with the alu — selects out the ‘Sic ica, oxyd of rekal & nd water, Sane uses 
these alone to ma a formula. ere is no sufficient Sgig that the 
is not identical with the nickel-gymnite of Gent h (see Min., p. 286).—p.] 
Ortuoctasr [242, II, III, V, VI].—The feldspar of the zircon-syenite has been 
analyzed by Dr. C. Bergemann (Pogg., cv, 118) and the view confirmed of its being 
a soda- searing ortho 
gad e [898]—The osteolite of the Kratz mountain near Friedland in Bohe- 
mia, a snow-white earthy mineral having G.==2°828 to 2°829, afforded Diirre (Pogg, 
cy, 155): : 
6 Ca Si x Fe Mg cl H 
34:64 44-16 8:89 614 O51 0-79 sh 2:97==98'70 
ps ore is mixed with a silicate; the former contains of the abov e, P34 
pe ade 40°985. _The silicate has the composition nearly of an te Ho rr cul 
being Ca*Si+-2R18i. 
_ Pecrotrre [305, IT, ITI, i o 5, 6, in the author’s Mineralogy are of 
the pectolite te of Bergen Hill, 
es slr acing nig mineral occurs as the base of a granitic rock in Russia, in 
ey go 
white aid does not melt even on the edges. Composition 
Si noe Fe . Ca. Mg “K H Quartz 
58:90 20° 039. tr. 050 O29 016 .835.. 10:30=-99°38 
affording the one AISi®-L OF. 
Prenorsxwe [345, II, IV, VI].—Descloizeaux has found (L’Institut, 1859, 33) 
that perofakite has two axes of double refraction quite distant, with the bisectrix 
negative. is was observed on specimens of a brownish yellow ssid an Zer- 
matt and the Urals; and it is a —— whether the black crystals from the Urals, 
which appear to be monometric, are not pseudom 
Gop er [425, II, VI].—The Hhlite from Ehl, has been analyzed by 
she rere n and found to contain vanadic acid. His analysis afforded (Jabrb- 
1858, 1 
aA Cu H 
17°89 734 64°09 8:90 
Oxygen, 10°12 1:90 12°98 790 
Pyropayriure [303, I, VI].—A mineral resembling massive pyrophyllite, 
according to W. J. Taylor "Proc: Ac. N. Sci. Philad., Aug. “s63) | ‘at ca yet ¢ anal- 
yzed, containing imbedded quartz crystals, at a coal mine in Sch aber a. It 
is a tough, whitish mineral with a pearly lustre, somewhat pooh tod: See ng 4 
layer not “a one-eighth inc 
Locality of pyrophyllite in Cabell see under Lazulite, 
Pyrox MLO A I, Il, V, V1].—The pale green smaragdite of the euphotide of 
the Alps afforded T. S. Hunt (this Jour., [2], xxvii, 348): 
Si Al Ca Mg Fe Gr Ni Na ign 
5430 454 1372 1901 387 O61 tr. 980 0:30—9915 
14:2 2°34 
18°07 
Viesnesthe gen ratio for R, #, Si, 13-29 : 2°12 : 28:96. 
iia: feula caalittabd, Gchtaten ia w ioek-qroen xi inci aes — 
of pyroxene, from Trayersella in Piedmont magnetic It is so 
i Seem 
