United States or Jordan ? Vote for the TOP Country of the Week !
The origin of its component mineral matter must be sought in the denudation of the Himalayas within a very recent geological period. The contrast between the fertility of the alluvium and the sterility of the protruded quartzy rocks is very striking, cultivation running up to these fields of stones, and suddenly stopping.
Coming thus to a deeper gouge in the sand of the hill, he halted and gazed attentively at a thick seam of rock outcropping sharply where the long-gone freshet had laid it bare. In mining parlance it was "quartzy." To Jim it appeared even more. He stooped above it and attempted to break away a fragment with his fingers. At this he failed.
This material of our smooth green mountains may be termed an argillaceous schistus; it has generally calcareous veins, and is often fibrous in its structure resembling wood, instead of being slatey, which it is in general. There is however another species of schistus, forming also the same sort of mountain; it is the micaceous quartzy schistus of the north of Scotland.
The coal-seams are few in number, six to twelve inches thick, very confused and distorted, and full of elliptic nodules, or spheroids of quartzy slate, covered with concentric scaly layers of coal: they overlie the sandstones mentioned above.
Am ready to lose a few dollars upon him, particularly as he might crack up all quartzy in the middle. They offer to take him by weight at three dollars and a half per pound below standard. Please say if agreeable. "I fear, my dear, that there are bad times coming for all of us here in this part. Not about money, but a long sight worse; bad will, and contention, and rebellion, perhaps.
I had fortunately brought a small phial of brandy, which, with hot water from the boiling-apparatus kettle, refreshed us wonderfully. The spur that divides these plains from the Lachen river, rises close to Kinchinjhow, as a lofty cliff of quartzy gneiss, dipping north-east 30 degrees: this I had noticed from the Kongra Lama side.
First, there is no distinction to be made of what is termed primary and secondary mountains, with regard to the position of their strata; every different species of stratum, from the stratified granite and quartzy schistus of the Alps to the oolites of the Jura and Saleve, being found in every respect the same; whether this shall be supposed as arising from their original formation, or, according to the present theory, from a subsequent deplacement of strata formed originally in a horizontal situation.
It is upon occasion of describing one of the species of alpine stone or schistus which contains quartzy particles. Nouveau voyage minéralogique, etc. Journal de Physique Aoust 1784.
Returning over the hills, I found Hardwickia binata, a most elegant leguminous tree, tall, erect, with an elongated coma, and the branches pendulous. These trees grew in a shallow bed of alluvium, enclosing abundance of agate pebbles and kunker, the former derived from the quartzy strata above noticed.
The highly crystalline nature of the rocks, at these great elevations, is due to the action of veins of fine-grained granite, which sometimes alter the gneiss to such an extent that it appears as if fused into a fine granite, with distinct crystals of quartz and felspar; the most quartzy layers are then roughly crystallized into prisms, or their particles are aggregated into spheres composed of concentric layers of radiating crystals, as is often seen in agates.
Word Of The Day