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Presently she went and knelt in the windowseat, drawing patterns on the glass and looking up the side-street at the Castle Rock, which now glowed with a dark pyritic lustre under the queer autumn day of bright south sunshine and scudding bruise-coloured clouds, seeing the familiar scene strangely, through a lens of tears.
I was lately consulted with respect to the treatment of a pyritic ore in a very promising mine, but could not recommend the above treatment, because though the pyrites in the gangue was similar, the bulk of the lode consisted of silica, consequently there would be a great waste of power in triturating the whole of the stuff to what, with regard to much of it, would be an unnecessary degree of fineness.
If it contain any saline substances, for example, the sulphates of soda or magnesia, their quantities must be very insignificant. In Italy, the Pisciarelli of the lake Agnano have a temperature equal to 93 degrees. It cannot proceed from the decomposition of sulphurets of iron, or pyritic strata.
Pyritic lodes usually contain a considerable proportion of calcareous matter, mostly carbonates, and consequently it appears not improbable that the gold may remain in some instances as a sulphide, particularly in samples of pyrites, in which it cannot be detected even by the microscope until by calcination the iron sulphide is changed to an oxide, wherein the gold may be seen in minute metallic specks.
And one day it came to pass that Pu sent a priceless gift to the Celestial and August: a vase imitating the substance of ore-rock, all aflame with pyritic scintillation, a shape of glittering splendor with chameleons sprawling over it; chameleons of porcelain that shifted color as often as the beholder changed his position.
With regard to auriferous pyritic lodes, it does not appear even now to be clear, as some scientists assert, that their gold is never found in chemical combination with the sulphides of the base metals. On the contrary, I think much of the evidence points in the other direction. I have long been of opinion that it is really so held in many of the ferro-sulphides and arsenio-ferro sulphides.
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