74 Scientific Intelligence. 
GorceIx gives the following analyses of minerals from Ouro 
— (formerly Villa Rica), in the province of Minas Geraes, 
earn mica (fuchsite) ; specific gravity 3:1. 
SiO. Al.Os,Fe.0; Cr.O; MgO K.O Na,O Volatile matter. 
3 7 7 
46°5 37°2 09 08 Ae ai 4% = 993 
Hydrargiltite ; specific gravity 2°3. 
Al,Os H,O 
65°2 34°83 = 100-00 
Wavellite ; specific gravity 2°34, 
P.O; F Al,O3 vert roe H,O 
33-0 3°6 3671 26°2 = 99°4 
_ Gorceix calls attention to the nee amount of fluorine present in 
this mineral; it was determined by the St. Claire Deville process. 
yr op yllite, in greenish white acicular crystals; specific grav- 
ity 2°76. 
2 — FeO CaO H,O 
5:3 8-0 7 0-4 55 = 100°9 
In the same ee the po rebe of rolled crystals of monazite in 
the diamond sands of the Jequetinhonha near Gianntines is noted. 
A similar mineral, found abundantly in sands from Caravellas in 
the province of Bahia, consists cto of phosphate of cerium 
and other rare earths, but 2 Sore anboahs speci- 
mens in specific gravity (5°01) and in aspect. Its crystalline 
form could not be determined. By error it is stated to be from 
the Serra de Quebra Cangalha in the se iies of Sao Paulo. + 
10. Groddeckite: a new mineral of the Chabazite group. —A 
which was obtained in 1867 from the Franz-August vein at 
Andreasberg in the Harz. The mineral occurs in small trans- 
arent Se bees with vitreous luster, covering calcite crystals. 
e-crystals form snags bari he a prem one geek a scalenohe-. 
dron nearly coincident with i m ; in habit 
and angles it is hardly of be dictingaished rg ors senate. The 
hardness is between 3 and 4. An analysis by Broockmann upon 
0°0559 gr. gave the itewie results : 
Sid. Al,O; Fe,0; CaO MgO Na,O H,O 
61°2 12°0 TI Pe 33 [45] 20°2 = 100° 
A comparison of the seihaed with the percentage composition of 
gmelinite shows that the new species, or more properly new vari- 
ety, differs in the subutivatien of iron ses quioxide for of the 
alumina, and of magnesia for part of the lime. The high per- 
centage amount of silica is ascribed to an admixture of quartz, 
but the material at hand was too scanty to allow of direct proof 
of this point, or indeed of another and more complete analysis 5 
