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Among the notable things which attended this eruption, it is recorded that in Torre del Greco metallic and other substances exposed to the current were variously affected. Silver was melted, glass became porcelain, iron swelled to four times its volume and lost its texture. Brass was decomposed, and its constituent copper crystallized in cubic and octahedral forms aggregated in beautiful branches.
=Chloride of Barium= occurs crystallized in irregular plates, like magnesium sulphate, soluble in water and bitter in taste. =Carbonate of Barium= is found in shops as a fine powder, tasteless and colourless, insoluble in water, but effervescing with dilute acids, and readily decomposed by the free acids of the stomach. =Nitrate of Barium= occurs in octahedral crystals, soluble in water.
A piece of glass or porcelain held to the flame will have, if arsenic be present, a deposit on it having the following characters: In the centre a deposit of metallic arsenic, round this a mixture of metallic arsenic and arsenious acid, and outside this another ring of arsenious acid in octahedral crystals.
If this ring be also heated, octahedral crystals of arsenic will be deposited farther up the tube, and are easily recognized by the microscope. The contents of the stomach, or the solid organs minced up, should be boiled with pure hydrochloric acid and water, then filtered. The filtrate can then be subjected to Marsh's or Reinsch's process. Tests.
"Yes," continued Lemulquinier, "I found the diamond in the china capsule which communicated with the battery which we left to work, monsieur and see!" he added, showing a white diamond of octahedral form, whose brilliancy drew the astonished gaze of all present. "My children, my friends," said Balthazar, "forgive my old servant, forgive me! This event will drive me mad.
Another mass was composed of prisms in the form of truncated pyramids; and in another he found quadrilateral and octahedral prisms, the former splitting parallel to the faces, and also truncated pyramids with five and six sides.
Wilde analysed the sulphur as follows: Silica, 81.13; water, 8.87; and a trace of lime. Others have obtained from the mineral, when condensed upon a cold surface, minute crystals of alum. Mr. Addison found in the 'splendid crystals of octahedral sulphur' a glistening white substance of crystalline structure, yet somewhat like opal.
This hill is conspicuous from rising to the height of 6,400 feet: its summit shows a nucleus, uncovered for a height of 800 feet, of fine greenstone, including epidote and octahedral magnetic iron ore; its flanks are formed of great strata of porphyritic claystone conglomerate associated with various true porphyries and amygdaloids, alternating with thick masses of a highly feldspathic, sometimes porphyritic, pale-coloured slaty rock, with its cleavage-laminae dipping inwards at a high angle.
The crystals are oftenest found octahedral and dodecahedral that is, eight and twelve sided, and the diamond-cutter takes advantage of these forms in shaping the diamond. The modern lapidary must have a perfect knowledge of optics and be a skilful stone-cutter. The numerous planes or faces which he cuts on the surface of the diamond are called facets.
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