140 The American Naturalist. [February, _ 
produced in the inclusion ; whereas in the case of the basaltic altera- — 
tion the last two are found in the metamorphosed rock. In a later 
article Lacroix 3 summarizes the results of his study of inclusions, with 
reference especially to those of the Haute-Loire. When the inclusions 
are of the same composition as the enclosing rock, the former have in 
general been{well preserved. If, on the contrary, the inclusion differs 
in its silica content from the surrounding rock, it is easily destroyed, 
merely traces of it remaining to mark its former presence.——Gray- 
wacke in contact with granite in the~Lausitz, Saxony, is changed to 
knotty (Knoten) graywackes, in which muscovite, biotite, quartz, feld- _ 
spar, and tourmaline occur as new products, and finally into a quartz- 
mica rock with cordierite, tourmaline, and some other new products. 
On the granitic side the rock has assumed a gneissic aspect, thought by 
Herrimann and Weber‘ to be the result of flowage. The micro 
structure of several calcareous odlites from Iowa, and of siliceous 
odlites from Pennsylvania, is represented by Messrs. Barbour and 
orrey® as concretionary in most cases, while in others the spherules | 
have a brecciated or mosaic appearance. Analyses of several kinds ot 
odlites are given in the paper. 
New Minerals.—Cassanite, biad with barite occurs on å 
copiapite specimen from Sierra Gordo, Chili, in the form of large, 
brown, prismatic crystals, without well-developed faces. According to 
Darapsky ê their streak is orange, hardness 3, and density 2. 18. They ; 
are but slightly soluble in water or in cold hee acid, but easily : 
dissolve in hot acid. Their composition (SO, = ; Fe,0, = 
H,O = 30.76; barite = 1.15) corresponds to Fe = (Fe0)(S0).+ 80. 
The crystallization is probably monoclinic, Manganopectolite 5 Beer 
associated with ozarkite and other decomposition products of eleolite- : oe 
syenite at Magnet Cove, Ark.” On a fresh fracture the mineral. is ; 
light gray and transparent. On its exterior it is covered with an- 
- Opaque coating of brown manganese oxide. The crystals are pounded ` 
by oP, Pæ, + 2P% and Po » and their axial ratio is @ ee 
1.0731: 1: 4840. Their habit i is thick tabular. Cleavage is 
STE to oP and œ Pæ. Hardness = 5, and density 2.845- Compo- 
“ab, FeO, CaO MnO Na,O H,O cO, ! 
53-03 .I0 30.28 4.25 8.99 2.43 
è Bull. Soc. Franç. d. Min., XIII., 1890, p. 100. ee 
- * Neues Jahrb. f. Min., etc., 1890, II., p. 187. vee 
P. 
. Min., etc., 1890, II., p. 267. 
7 Me F. Williams, ` Zeits, Í. Kent, XVIL, 1890, p. 386. 
