138 Seventh = to Dana’s Mineralogy. 
of the silica and titanic a R+4, Ti+-Si, the ratios 1: 2°09, 
1: 2-13, and writes the Fecsila as SH "Be ) Tit. 
[The mean of the two gpaizern nfs in fact very nearly 7-5R : 1-5: 5} Ti: 
5Si i—< 5 Si), or od 1#: 3-5Ti: 55i, whic -si ac 
for the above form Under ilmenite ae 136) Hb) shown that the compe 
01 
to Sr, (since aoe pe he hea and Phen nies 
io be is 2 
by 
silica and the other ——— it dees 4p in nes 1 to 22-94=2-002 : 3-000, and 
i ‘80 : 22-71=1°96 : 
cies (and this is so, of course, prea silica ‘be Si or Si). Hence comes the formula 
(Re, Be be Si?, which is equivalent to (Re, = Sif, as pom in = P ocomtbggee p- 341, 
rdmann’s analysis, and since co sl gi orbes. Erdmann’s analyses, a8 
calclte by Rammelsberg, afford ore same eres t, giving for the ratio 15°58 : 23°79 
=1'97:8; and 15°30 : 23°44=1°96 : 3.— 
KRANTZITE, 0. Bergemann (J. f. p. Com. 65).—Krantzite is a fossil resin 
from the brown coal of Lattorf, and had been considered impure amber. It occurs 
rad : 
el 
fo 8 and is nec no lag ove, G.=0°968; or of an 
005 t 2 i 
2. li esi as —A, E. Nordenskiéld has given pe e name Ersbyite to the 
f No Seven the ner a . p. 287]. Itis coraiaiadll 
peraps triclinic, and has the formula GaSi+ the — of labradorite. From 
Beskrifv. Finl. Min. hes in in Jab sem 5 aes 
N. W ar ff in on Ball ‘de la Soe. econ es Naturalistes de Moscou, 1857, oo 4 
yale 518 «tala occurs in aeteee intersecting syenite. As remarked by. 
ialadacs the colorless and greenish lapis lazuli becomes blue on heating. 
Lazuutre [404, IT]. Jeeta: occurs in beautiful sky-blue crystals i ad eet Co., 
Georgia, on Graves’ Mountain, about twelve wllos northwest of the a us belt 
n 
pyrophyllite, hematite. The lazulite occurs in certain layers of a bed of itacolum 
poem through them in ak beg yin one-quarter to one inch long. 
paper contains figures of the fori 
Lrapatture [371 te Morgan Si to C. U. Shepard (this Jour., xxvii. 40) occurs 
small ee ilver Mine, in Spartanburg District, 8. C., with py 
romorphi 
tae — black mica, &e., see Geol. Soc. Proc. in Phil. Mag., 
xvi, p. 396. 
oa {181, Il, IV].—Analyses of various = of Alabama are given in 
Tuomey’s Second Biennial Geol. Rep. of Alabam 
cess [429]—The crystallization of liroconite ing to ajenciones 
(Llnstitot, 185 1859, 38) is f monoalinlt, having J: J=74° Si" aad and r* vertical axis 
ie a ae IV, VI].—Rammelsberg in Pogg, civ, 536, gives several 
analyses, (05 YT} Rammer One from basalt near Bisenach, 
* 
wh Nin oe area lie oe Teas.) Ae 
aes 
eT 
