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Updated: May 2, 2025
PORPHYRY is one of this class, and very characteristic of the volcanic formations. Thus trachyte is usually porphyritic; for in it, as in many modern lavas, there are crystals of feldspar; but in some porphyries the crystals are of augite, olivine, or other minerals.
She rubbed her hair with Pemberton's "Olivine and Petrol" to keep it from growing thin, and her neck with cocoanut oil to make it more full. She sent for a bottle of "Mme. LeGrand's Bust-Developer," and spent several Saturday afternoons at the beauty parlors of Mme.
It overflows with stirring incident and exciting adventure, and the color of the era and of the scene are finely reproduced. The illustrations add to its attractiveness." Boston Gazette. By Right of Conquest; or, With Cortez in Mexico. By G.A. HENTY. With illustrations by W.S. STACEY. 12mo, cloth olivine edges, price $1.50.
Both these rocks are composed of triclinic feldspar and augite with more or less olivine, magnetic or titaniferous oxide of iron, and usually a little nepheline, leucite, and apatite; basalt usually contains considerably more olivine than melaphyre, but chemically they are closely allied, although the melaphyres usually contain more silica and alumina, with less oxides of iron, lime, and magnesia, than the basalts.
There is, however, no lack of thrilling adventure, and every lad who is fortunate enough to obtain the book will find not only that his historical knowledge is increased, but that his own patriotism and love of country are deepened. For the Temple: A Tale of the Fall of Jerusalem. By G.A. HENTY. With illustrations by S.J. SOLOMON. 12mo, cloth, olivine edges, price $1.00. "Mr.
It enters largely into the composition of a trap dike cutting through Old Red Sandstone in Forfarshire, and in that case is probably an altered basaltic dike which had contained much olivine.
The jagged mountains near Port Louis rise to a height of between two and three thousand feet; they consist of strata of basalt, obscurely separated from each other by firmly aggregated beds of fragmentary matter; and they are intersected by a few vertical dikes. The basalt in some parts abounds with large crystals of augite and olivine, and is generally compact.
By JAMES OTIS. 12mo, ornamental cloth, olivine edges, illustrated, price $1.50. Two lads from Portmouth, N.H., attempt to enlist in the Colonial Army, and are given employment as spies.
Should we conclude from this position that they are of more recent formation than the lithoid basaltic lava, which contains olivine and augite? I cannot admit this last hypothesis; for lateral eruptions may have covered the feldsparry nucleus, at a period when the crater had ceased its activity.
Hypersthene. Bronzite. Olivine. Olivine. The minerals which form the chief constituents of these igneous rocks are few in number. Next to quartz, which is nearly pure silica or silicic acid, the most important are those silicates commonly classed under the several heads of feldspar, mica, hornblende or augite, and olivine.
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