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(without typos) from the publisher. Not indexed. Not illustrated.
1897 Excerpt: ...be shown under certain conditions, they unite to
form small masses of titanic iron, leads to the belief that the
view of Professor Rosenbusch is correct, namely, that they consist
principally of titanic iron ore or ilmenite. The transparent ones
have the form of the mineral known as micaceous titanic iron ore,
which Lattermannf found intergrown with magnetite in the
nephelinite of the Katzenbuckel. The peculiar colour of this
mineral, moreover, resembles perfectly thnt of these inclusions.
The diverse results which the several investigators have obtained
in the matter of the solubility of these inclusions may perhaps be
explained by the titaniferous iron ore in some hand specimens being
richer in titanic acid than in that of others. In this connection
it must be mentioned that titanic iron ore is a mineral which is
constantly found in these anorthosites in Canada, often in enormous
quantities, so that it is considered as particularly characteristic
of them, while in the Laurentian proper the iron ores, in the
greater number of cases, contain no titanic acid. Lacroix, J Hagge,
Microskopiche Unterftiichung iiber Gabbro and verwandte Gesteine,
Kiel, 1871, S. 46. t Lattermann in Rosenbusch Mass. Gest, p. 786. J
Lacroix--Contributions a 1-etude des gneiss & Pyroxene, p.
141--Bull. Soc. Min. France, April, 1839. who has investigated
somewhat similar inclusions in certain Norwegian gabbros, which,
however, are double refracting, thinks that they are pyroxene,
especially as they frequently appear to be grouped together,
forming larger grains which may be determined as belonging to this
species: "Les grains en question semblent avoir attire a eux les
particules pyroxeniques en suspension dans le feldspath et les
avoir incorporees a leur masse." It is q...
|Country of origin:
Department of Geology
||246 x 189 x 4mm (L x W x T)
||Paperback - Trade
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