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Updated: June 23, 2025
Five or six miles beyond the Hrafnajau, near the summit of a dividing ridge, we came upon a very singular volcanic formation called the Tintron. It stands, a little to the right of the trail, on a rise of scoria and burned earth, from which it juts up in rugged relief to the height of twenty or thirty feet.
The whole mass being now poured out into troughs, the scoria was washed off from the amalgam, which was gathered and put into a stout leathern bag with a cloth bottom, and the unabsorbed mercury drained out.
However, it had also excited his curiosity, and he would have liked to investigate it, to establish beyond dispute what scientific truth might be in it, and render pure Christianity the service of ridding it of this scoria, this fairy tale, all touching and childish as it was.
Their surfaces are so fresh and undecayed that here the effusive eruptions may well have continued to within the period of human history. In places small mounds of scoria show that the eruptions were accompanied to a slight degree by explosions of steam. So fluid was this superheated lava that recent flows have been traced for more than fifty miles.
The geological formation of the country we had passed through, consisted in the higher ranges of an argillaceous rock, of quartz, or of ironstone. Upon some of the hills the small loose stones had a vitrified appearance in others they looked like the scoria of a furnace, and appeared to be of volcanic origin, but nowhere did I observe the appearance of anything like a crater.
Then came an exceedingly rugged descent of quite a precipitous nature, but lovely in the extreme, so clothed was it with tropic verdure, though this was more beautiful to the eye than to the feet, for it often concealed treacherous crevices between blocks of scoria, and ugly cracks and rifts, some of which were dangerous, while others were awful from their depth and the low, hissing, murmuring sounds which came from their inmost recesses.
The report was confirmed by an old Arab Bash-Buzuk at El-Wijh; he declared that in his youth he had seen a tall furnace, and a quantity of scoria from which copper could be extracted, lying northwards at a distance of eighteen hours' march and five by sea. The next important feature is the Wady Salbah, the Telbah of the Chart, up whose inland continuation, the Wady el-Nejd, we shall travel.
However, it had also excited his curiosity, and he would have liked to investigate it, to establish beyond dispute what scientific truth might be in it, and render pure Christianity the service of ridding it of this scoria, this fairy tale, all touching and childish as it was.
Cones made of fragments may have sides as steep as the angle of repose, which in the case of coarse scoria is sometimes as high as thirty or forty degrees. About the base of the mountain the finer materials erupted are spread in more gentle slopes, and are also washed forward by rains and streams. The normal profile is thus a symmetric cone with a flaring base.
However, it had also excited his curiosity, and he would have liked to investigate it, to establish beyond dispute what scientific truth might be in it, and render pure Christianity the service of ridding it of this scoria, this fairy tale, all touching and childish as it was.
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