The American journal of science and arts . on Z . . 120 s ons . . 120 A few crystals of transparent Indicolite, of a deep color, were metwith, which were associated with Rubellite, and imbedded in Lepido-lite. From one of these, I had two tables (five eigths of an inch byhalf an inch) cut and mounted ; but, although of a good color, theirbeauty is injured by several cracks. Fragments of a less transparentvariety of Indicolite were pretty abundant; also small, somewhat flat-tened crystals of Rubellite, with one or two polished faces, and pos-sessed of a good color and considerable transparency;
The American journal of science and arts . on Z . . 120 s ons . . 120 A few crystals of transparent Indicolite, of a deep color, were metwith, which were associated with Rubellite, and imbedded in Lepido-lite. From one of these, I had two tables (five eigths of an inch byhalf an inch) cut and mounted ; but, although of a good color, theirbeauty is injured by several cracks. Fragments of a less transparentvariety of Indicolite were pretty abundant; also small, somewhat flat-tened crystals of Rubellite, with one or two polished faces, and pos-sessed of a good color and considerable transparency; and a fewtransparent prisms of the green Tourmaline, precisely resembling thesame mineral from Brazil. I had formerly observed, that fragments of the above describedTourmalines became electric, on being held to the fire for a few mo-ments ; but it was not until very recently, that 1 discovered the ex-treme sensibility of my polished specimens to electrical placed the Rubellite broach for a few moments near some. * These Tourmalines were cut and polished by Messrs. Montanye & Mason, Lapi-daries, 93 Reed street. New York. Another crystal, which I have in the hands ofa lapidary in London, I am informed, has afforded a red broach, which is regarded as a great curiosity. 302 Mineralogical Journey. warm ashes, I found, as might have been expected, it attracted themetallic needle, on bringing it near one of the little knobs by which itis terminated. Five or six hours afterwards, having occasion to ex-plain this action to a friend, I had brought the Rubellite no nearerthan three quarters of an inch of one of the balls, when it began toapproach; and such was the force of the attraction, that the impetusacquired by the needle in coming up to the broach was sufficient togive it, very nearly, a complete revolution. This experiment we re-peated a number of times, without observing any diminution in theattracting force. The broach had been laid aside, in an apartmentwitho
Size: 1252px × 1995px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookpublishernewhavensconverse, bookyear1820
