418 General Notes. 
the following analysis, was evidently a true spinel of novel crys 
talline form: 4 
iO, FeO CaO MgO AlO 
(by difference) 
0.65 3.00 1.20 27.18 7.97 =) 100 a 
—H. C. Lewis, — 
Tue ORIGIN or THE DrAMonp.—W. H. Hudleston! has advanced 
an extraordinary theory to account for the origin of thed : 
of South Africa. As is well known, the diamonds occur inasot 
of soft, earthy breccia, made up of fragments of many kin‘ of 
i 
part of the enclosed pebbles consist of basalt and other igi i 
| shells also occur in thè 
diamantiferous breccia, the matrix of which is a soft e 
ferro-magnesian silicate. Dykes of dolerite, gabbro andother 1 
character of the diamond rock.” He thinks that su in i 
steam was the eruptive agent, and suggests the analogy ; 
volcanoes. ` 
Since no diamonds have been found except in this soft 9 ah 
he suggests that the diamonds were formed in the bre ae 
having been formed at a considerable depth and then one SM 
ward with “ the rise of the viscous fluid in the pipe "k ae 
bon is supposed to have been derived from certain Ca rhea 
shales, which were distilled under enormous Pres tine form 
carbon would have “ nochoice but to assume the mbar š 
Certainly this theory requires more evidence than 
presented to support it. oft 
URraxorTHORITE.—In 1876 Nordenskiöld found oe contait 
the form of zircon, am e 
nium. The ee 
t Hitterd, Norway 
d by Collier in betag 
of Lake Champlain, and called by him uranothorilé, STER 
Collier regarded the uranium as combined a tre ora 
but as L. F. Nilson believes,” this was a mist ne ‘the ur jum 
isting as UO% Now Zimmerman has proved t and the tho 
her i 
proportions. The mineral of Arendal 
rich in uranium of the thorite of Brev! 
Berzelius in 1829. ft ele 
As the properties of the Lake Champlain, minera sson 
with those of the Norwegian thorite, there 15 Ys 
name uranothorite. tas 
1 Mineralogical Magazine, Vol. v, No. 25, P+ 199 
? Ann. a. Chimie et Physique, Nov. 1833, P- 429: 
