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Updated: April 30, 2025
It probably facilitated the rupture of the earth and the formation of the gulf of Cariaco. This clay is of a smoky colour, impregnated with petroleum, mingled with lamellar and lenticular gypsum and sometimes traversed by small veins of fibrous gypsum. It incloses angular and less friable masses of dark brown clay with a slaty and sometimes conchoidal fracture.
Above you and around you are beams and joists, on some of which you may see, when the light is let in, the marks of the conchoidal clippings of the broadaxe, showing the rude way in which the timber was shaped as it came, full of sap, from the neighboring forest. It is a realm of darkness and thick dust, and shroud-like cobwebs and dead things they wrap in their gray folds.
I had seen, while herborizing between the port of Orotava and the garden of La Paz, heaps of greyish calcareous stones, of an imperfect conchoidal fracture, and analogous to that of Mount Jura and the Apennines. I was informed that these stones were extracted from a quarry near Rambla; and that there were similar quarries near Realejo, and the mountain of Roxas, above Adexa.
Some of the blackish varieties of this rock have a conchoidal fracture and resemble basalt; others have an irregular fracture. Some of the grey and purplish varieties are thickly speckled with green earth and with white crystalline carbonate of lime; others are largely amygdaloidal with green earth and calcareous spar.
No well having been dug in these countries, we can have no information respecting the superposition of the strata. It is generally of a smoke-grey colour, earthy, and friable; but it encloses more solid masses of a blackish brown, of a schistose, and sometimes conchoidal fracture. These fragments, from six to eight inches long, have an angular form.
There were built-up fabrics, called Charlottes, caky externally, pulpy within; there were also marangs, and likewise custards, some of the indolent-fluid sort, others firm, in which every stroke of the teaspoon left a smooth, conchoidal surface like the fracture of chalcedony, with here and there a little eye like what one sees in cheeses.
The serpentine is sometimes of an esquillous, sometimes of a conchoidal fracture: this was the first time I had found metalloid diallage within the tropics. It were to be wished that these fine masses were employed in the arts as they are in several parts of Germany.
Thirdly, the whole substance of the bounding rock suddenly passes into an angulo-concretionary mass of obsidian. The obsidian assumes its jet black colour and perfectly conchoidal fracture, only when in large masses; but even in these, on careful examination and on holding the specimens in different lights, I could generally distinguish parallel streaks of different shades of darkness.
M. Boussingault, in a memoir which he has recently addressed to me, calls the rock of the Morros a problematic calcariferous gneiss. This expression seems to prove that the plates of mica take in some parts a uniform direction, as in the greenish dolomite of Val Toccia. This cement, where it abounds, has a conchoidal fracture and passes to jasper.
Above you and around you are beams and joists, on some of which you may see, when the light is let in, the marks of the conchoidal clippings of the broadaxe, showing the rude way in which the timber was shaped as it came, full of sap, from the neighboring forest. It is a realm of darkness and thick dust, and shroud-like cobwebs and dead things they wrap in their gray folds.
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