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Updated: May 2, 2025
The upper are basaltic, generally compact, but sometimes scoriaceous and amygdaloidal, with associated masses of wacke: where the basalt is compact, it is either fine-grained or very coarsely crystallised; in the latter case it passes into an augitic rock, containing much olivine; the olivine is either colourless, or of the usual yellow and dull reddish shades.
The rock of which it is formed consists of exceedingly massive, coarsely-crystalline dolerite, rich in olivine, and divided into large quadrangular blocks by parallel joint planes.
Befriended by a stalwart trapper, a real rough diamond, our hero achieves the most happy results. By Pike and Dyke: A Tale of the Rise of the Dutch Republic. By G.A. HENTY. With illustrations by MAYNARD BROWN. 12mo, cloth, olivine edges, price $1.00.
"Boys with a turn for historical research will be enchanted with the book, while the rest who only care for adventure will be students in spite of themselves." St. James's Gazette. St. George for England: A Tale of Cressy and Poitiers. By G.A. HENTY. With illustrations by GORDON BROWNE. 12mo, cloth, olivine edges, price $1.00. "A story of very great interest for boys.
In these characters, it resembles those masses of decomposed olivine, described at St. Jago in the Cape de Verde group; and I should have thought that it had thus originated, had I not found a similar substance, in cylindrical threads, within the cells of the vesicular basalt, a state under which olivine never appears; this substance, I believe, would be classed as bole by mineralogists.
The lava consists of dark- greyish, harsh rocks, intermediate in character between trachyte and basalt, containing glassy feldspar, olivine, and a little mica, and sometimes amygdaloidal with zeolite: the basis is either quite compact, or crenulated with air-vesicles arranged in laminae.
As the basalt ordinarily consists of augite, and of olivine often tarnished and of a dull red colour, I was led to examine the stages of decomposition of this latter mineral, and I found, to my surprise, that I could trace a nearly perfect gradation from unaltered olivine to the green wacke.
The mass contains numerous broken crystals of olivine and augite, and small particles of black and brown scoriae; it is often traversed by thin seams of calcareous matter. It generally affects a nodular or concretionary structure.
But, by diverting our course some miles to the northward, we were able to ascend to the upper reaches of the river, and, here, to my delight, I found the banks and rapids studded with great green masses of olivine rocks.
With Clive in India; or, The Beginnings of an Empire. By G.A. HENTY. With illustrations by GORDON BROWNE. 12mo, cloth, olivine edges, price $1.00. "He has taken a period of Indian history of the most vital importance, and he has embroidered on the historical facts a story which of itself is deeply interesting. Young people assuredly will be delighted with the volume." Scotsman.
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