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Updated: May 7, 2025
If this ravine had not long ago attracted the attention of naturalists, when masses of granular limestone, and other primitive rocks, were laid bare by the rains, we might have thought them as rare at Vesuvius, as they are, at least in appearance, at the Peak of Teneriffe.
The plate is now withdrawn and exposed to the vapor of mercury at 212°. Where the daylight was strongest, the sensitive coating of the plate has undergone such a chemical change, that the mercury penetrates readily to the silver, producing a minute white granular deposit upon it, like a very thin fall of snow, drifted by the wind.
Sorby, in making a careful examination of the chalk by means of thin sections and otherwise, observed, as Ehrenberg had done before him, that much of its granular basis possesses a definite form.
It is obtained in perfectly pure, transparent, granular crystals, being entirely free from any portion of uncrystallisable sugar or colouring matter, and is prepared by the improved process of effecting the last stages of concentration in vacuum, and at a temperature insufficient to produce any changes in its chemical composition; the mode of operation first proposed by the late Hon. Ed.
Examined chemically, it proves to be composed almost wholly of carbonate of lime; and if you make a section of it, in the same way as that of the piece of chalk was made, and view it with the microscope, it presents innumerable Globigerinae embedded in a granular matrix. Thus this deep-sea mud is substantially chalk.
Farther south the Ghauts of Western Africa reappeared as the Serra do Crystal, and fringe the mighty triangle below the Equator. They are suspected to be auriferous in places. An American merchant on the Gaboon River, Captain Lawlin, carried home in 1843-44 a quantity of granular gold brought to him by the country-traders.
ALABASTER is a granular and compact variety of gypsum found in masses large enough to be used in sculpture and architecture. It is sometimes a pure snow-white substance, as that of Volterra in Tuscany, well known as being carved for works of art in Florence and Leghorn. It is a softer stone than marble, and more easily wrought.
She got the oysters, and in an overwhelming reluctance to return walked out to the end of the wharf, where a ship was discharging her cargo heavy plaited mats of cassia with a delicate scent, red and blue slabs of marble, baskets of granular cakes of gray camphor, rough brown logs of teak, smooth dull yellow rolls of gamboge, bags with sharp conflicting odors, baled silks and half chests of tea wrapped in bamboos and matting painted with the ship's name, Rose and Rosalie.
Tertiary deposits also appear in a less elevated position on the flanks of the Eastern Alps; but in the Central or Swiss Alps, the Palaeozoic and older Mesozoic formations disappear, and the Cretaceous, Oolitic, Liassic, and at some points even the Eocene strata, graduate insensibly into metamorphic rocks, consisting of granular limestone, talc-schist, talcose- gneiss, micaceous schist, and other varieties.
The fragments are angular or rounded, small or large, and consist of bluish or reddish compact feldspathic matter, in which a few acicular crystals of feldspar can sometimes be seen. The fragments often blend at their edges into the surrounding granular mass, and seem due to a kind of concretionary action.
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