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Updated: June 13, 2025
DIORITE, still less siliceous, is composed of hornblende and feldspar, the latter mineral being of different variety from the feldspar of granite and syenite. GABBRO, a typical basic rock, corresponds to basalt in chemical composition.
The Museum of Vannes, where most of the valuable objects found in the excavations are preserved, possesses quartzite, fibrolite, diorite, and even nephrite and jadeite hatchets, some of which materials are not native to Europe; as well as amber beads and a necklace of calaite, that precious stone described by Pliny, and which long remained unknown after his time.
This division corresponds with that proposed by Bunsen and Durocher for volcanic rocks, upon the results of analyses of a large number of specimens from various districts. Examples: Basalt, Dolerite, Hornblende rock, Diorite, Diabase, Gabbro, Melaphyre, and Leucite lava. Examples: Trachyte, Rhyolite, Obsidian, Domite, Felsite, Quartz-porphyry, Granite.
Admitting then that gneiss, mica-schist, granite, diorite, etc., were once necessarily covered up, how can we account for the naked and extensive areas of such rocks in many parts of the world, except on the belief that they have subsequently been completely denuded of all overlying strata?
Professor Gregory says that this Huaccoto basalt has a softness and uniformity of texture which renders it peculiarly suitable for that elaborately carved stonework which was so greatly desired by ecclesiastical architects of the sixteenth century. As compared with the dense diorite which was extensively used by the Incas, the basalt weathers far more rapidly.
I ascended the hills opposite our camp, and looked over an immense and apparently flat country, out of which small peaks and short ranges rose. The hills on which I stood were composed of Pegmatite, with patches of white Mica in large leaflets. During the journey we found granite changing into gneiss, diorite, and quartz rock.
The new inscription was engraved on the base of a diorite statue, which had been broken to pieces so that only the base with a portion of the text remained. From this inscription we learn that Narâm-Sin was the head of a confederation of nine chief allies, or vassal princes, and waged war on his enemies with their assistance.
The fore-claws of this tiger are the lacerating pinnacles of the Corbiere and the impaling rocks of Portelet Bay and Noirmont; the hind-claws are the devastating diorite reefs of La Motte and the Banc des Violets. The head and neck, terrible and beautiful, are stretched out towards the west, as it were to scan the wild waste and jungle of the Atlantic seas.
I meanwhile climbed a neighbouring hill to spy out the land ahead, hoping to see the white glitter of a salt lake, for we were in likely country, ironstone blows, quartz, and diorite giving evidence of its probable auriferous nature; we were therefore anxious to find water to enable us to test it.
"Well, then," said the mule, savagely, "you'll find it in the top right-hand drawer of my writing-table: the key is in that diorite bowl on the mantelpiece." The Jinnee unlocked the drawer, and took out the metal cap, which he placed in the breast pocket of his incongruous frock-coat.
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