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Updated: June 12, 2025
It occurs in small glassy, nearly globular crystals; they are generally not over three-sixteenths of an inch in diameter, and generally pure and perfectly transparent, having a hardness of a little over 5, and specific gravity of 3; as it generally occurs as a druse upon the trap, or an apopholite, calcite, etc., this is seldom attainable, however, and we have a very distinctive characteristic in another test: this is the blowpipe, under which it at first intumesces and then fuses to a transparent globule, and the flame, after playing upon it, is of a deep green color.
The color is handsomely brought out here in contrast with masses of calcite crystal, so as to present by the combination a charmingly beautiful room, from which we retired, feet first, down a "squeeze" to the Bridal Chamber, where we found ourselves perched on an irregular narrow ledge, high up on the wall, and cherishing a private conviction that exploration had met a checkmate; but the guide reached the floor and my nephew, Herbert, scrambled down with as much ease as the chipmunk he had chased to the house top a while before; so a little application settled the difficulty and re-united the party.
Now the name of Lugalzaggisi has been found upon a number of fragments of vases made of white calcite stalagmite which were discovered by Mr. Haynes during his excavations at Nippur.
Where the most minerals occur in the chlorite is when plenty of veins of calcite are in its vicinity, and its edges near the trap are dry and crumbly.
Calcite. In places the limestone is perfectly crystallized, and of a pure white or other color, when it forms an attractive mineral, and often worth removing. The limestone of the main quarry, carefully averaged, was found to have the following chemical composition. Lime. 11.09 Magnesia. 37.94 Carbonic acid. 30.61 Silica. 10.22 Water and loss. 4.90 Iron and alumina. 5.24 100.00
Their bright light showed the night reticulated with thin lines of smoke, like veins of calcite in a canopy of black marble. Our immediate country, pallid and tremulous, faded again, but in that brief prospect of a shadow land I glimpsed a road, the presentment of the long road to Bapaume. So the Bapaume road showed at night by inconsequential and unexpected lights.
The greater abundance are in the veins of the dark-green soft chlorite, and some few in horizontal beds. The minerals are found in the first condition by examining all the veins running from floor to ceiling of the tunnel. The ores of calcite first mentioned are very conspicuous, they being white in the dense black rock.
The beauty of vegetation denied those desolate buttes and ridges is atoned for by a marvelous abundance of most wonderful crystals of aragonite, calcite, barite and satin spar; each to itself, or two or more combined in beautiful geodes or else arranged in great flat slabs crystallized on both sides of a thin sheet of lime.
I do not say that in every case this mineral should be rejected, because it is frequently very beautiful and worthy of place in a cabinet, but should be kept only under the conditions mentioned further on in this paper, under the head of "Calcite in Weehawken Tunnel." The next mineral abundant in so many forms is quartz, and is not so readily distinguished as calcite.
According to Ritter, even two crystalline substances of different hardness, such as Calcite and quartz, become electric when rubbed together, the softer playing the part of 'resin' and the harder that of 'glass'.
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