850 | General Notes. 
undergone alteration into pseudophite, yielding a product having 
very much the appearance of serpentinized olivine. The augit 
gneisses are divided into scapolite-bearing varieties and thos 
as given in the text-books. The latter is probably a parting ” 
haa ; ars o 
acteristics of /avenite and cappelinite. The former occurs 
eleolite syenite? of the Province of Rio Janeiro, Brazil. It form 
brown to yellow, slightly transparent crystals, with a Pfs with 
habit and vitreous lustre. It is monoclinic in crystallization a 
à :B:c’=1O811 : 1 :0.8133, ?=71° 2434’. The twinnks 
the cleavage planes are parallel to the orthopinacoid, WAN © 
plane of the optical axes is the clinopinacoid. The ™ 
strongly pleochroic, ¢ > b > a — red-brown, yellowish-grr 
_Wine-yellow. Its specific gravity is 3.51, and its compos! ¢ 
SiO, ZrO, Feo (j MnO Cio NaO REE ae 
33-71 31.65 5.64 $06 fioo uz a te 
: Cappelinite is found in a small vein in the aug'te yoke 
- Little Aré in Langesundsfjord. It occurs in thick pe 
a agonal prismatic crystals with a fatty lustre. Their axia © 
I : 0.4301. Their analysis yielded: Ko 
D BO, YO., La(Di BaO CaO Na,0 
4d 17.13 P nee (Di), ee T re 5 0.61 939 0.21 
: urtids 
the borotitanate of magnesium and i Ce 
ille, N. Y., is generally found in prismat? | age 
tay direction of the vertical axis, Wit 
parallel to inani ; u etry om 
taining measurements of these, which indicate a SY™ wi 
responding to that of the n 
* Zeitsch. f. Kryst., x., 1885, p. 503, and Geol. För. i. Stockh. Forh-, 
Ba. 
> in, ie PT 
— Graeff, N. J. B., 1887, i. p. 201. 3 Bul. d. 1. Soc. Fr. du = 
