Page:Transactions of the Geological Society, 1st series, vol. 1.djvu/397

 should seek for it, resting on the single circumstance of the double colour, indicated by its name, without regarding the peculiar tints, he might very easily be led into a mistake, as either of the substances which I have just mentioned would exhibit this character.

The name of Yolite, which had been given to bardiglione by M. Tondi, beside having the same defect of being derived from a variable character, that of colour, had also the inconvenience of recalling to the mind other substances, the names of which bore a considerable resemblance to it. All these inconveniences, it appears to me, would be avoided, by choosing for mineral substances a proper name without any peculiar signification in itself, and which should have no other object but that of preventing one mineral from being confounded with another.