Re: [meteorite-list] 1848: light produced when meteorite sawn - possible or impossible?
Hello Chris and list, At 02:02 AM 9/13/05, Chris quoted the Literary Gazette: In sawing the mass, globules were inflamed by the friction of the teeth of the saw, and a bright light produced. The word globules in connection with an iron meteorite makes me think of troilite inclusions. While troilite and other FeS minerals will oxidize, the reaction is not sufficiently exothermic that these minerals will combust -- EXCEPT when finely divided. H. See for example this discussion: http://www.groupsrv.com/science/about106186-45.htmlsid=8fd51b573984fae5b3eeabd7ab0eef65 Iron sulfide is a pyrophoric material that oxidizes exothermically when exposed to air. It makes no difference whether these pyrophoric sulfides exist as pyrite, troilite, marcasite, or pyrrhotite. If the iron sulfide paricles are fine and mixed well with an oxygen so much heat can be generated so that individual particles of iron sulfide become incandescent. pyrophoric: emitting sparks when scratched or struck Best wishes to all, Piper __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] 1848: light produced when meteorite sawn - possible or impossible?
Ohio | Sandusky | The Sandusky Clarion | 1848-01-25 A REMARKABLE AEROLITE. On the 14th July last, a remarkable aerolite fell at Brannan, at Bohemia. Two fragments were found, one weighing fifteen, the other twenty-one kilogrammes. The aeorilite [sic] appeared to proceed, as is very often the case, from a small black cloud. The smaller fragment fell upon a house, pierced the roof, struck a beam which caused it lo deviate slightly from its course, passed through a ceiling composed of white clay and straw, and entered a room where several persons were assembled, but fortunately, noone was hurt. A circumstance worthy of remark was, that the straw of the ceiling traversed by the meteor was not in the least carbonized: it only appeared of a brighter yellow, with semi-metalic lustre; pieces of straw even adhering to the stone, presented no trace of carbonization. A fragment has been analysed by M. Fischer, of Breslau, who found in it, besides sulphuretted iron, carbon, phosphorus and bromine. In sawing the mass, globules were inflamed by the friction of the teeth of the saw, and a bright light produced. Literary Gazette. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] 1848: light produced when meteorite sawn - possible or impossible?
Chris list, Possible or impossible? Possible. Quite a few minerals can emit light on being crushed or scratched. This is termed triboluminescence. Additionally, some minerals can emit light when heated to temperatures still well below red heat. This is thermoluminescence. I don't know the composition of this particular stone, but if it has some non-metallic minerals, the action of the saw might cause light emission. --- chris aubeck [EMAIL PROTECTED] wrote: Ohio | Sandusky | The Sandusky Clarion | 1848-01-25 A REMARKABLE AEROLITE. On the 14th July last, a remarkable aerolite fell at Brannan, at Bohemia. Two fragments were found, one weighing fifteen, the other twenty-one kilogrammes. The aeorilite [sic] appeared to proceed, as is very often the case, from a small black cloud. The smaller fragment fell upon a house, pierced the roof, struck a beam which caused it lo deviate slightly from its course, passed through a ceiling composed of white clay and straw, and entered a room where several persons were assembled, but fortunately, noone was hurt. A circumstance worthy of remark was, that the straw of the ceiling traversed by the meteor was not in the least carbonized: it only appeared of a brighter yellow, with semi-metalic lustre; pieces of straw even adhering to the stone, presented no trace of carbonization. A fragment has been analysed by M. Fischer, of Breslau, who found in it, besides sulphuretted iron, carbon, phosphorus and bromine. In sawing the mass, globules were inflamed by the friction of the teeth of the saw, and a bright light produced. Literary Gazette. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] 1848: light produced when meteorite sawn -possible or impossible?
There's also the Piezo effect to consider, although the crystals normally associated with it aren't very likely to be found in meteorites... From: Norm Lehrman [EMAIL PROTECTED] To: [EMAIL PROTECTED], A1MagNew [EMAIL PROTECTED],Meteorite-list@meteoritecentral.com Subject: Re: [meteorite-list] 1848: light produced when meteorite sawn -possible or impossible? Date: Mon, 12 Sep 2005 17:40:43 -0700 (PDT) Chris list, Possible or impossible? Possible. Quite a few minerals can emit light on being crushed or scratched. This is termed triboluminescence. Additionally, some minerals can emit light when heated to temperatures still well below red heat. This is thermoluminescence. I don't know the composition of this particular stone, but if it has some non-metallic minerals, the action of the saw might cause light emission. --- chris aubeck [EMAIL PROTECTED] wrote: Ohio | Sandusky | The Sandusky Clarion | 1848-01-25 A REMARKABLE AEROLITE. On the 14th July last, a remarkable aerolite fell at Brannan, at Bohemia. Two fragments were found, one weighing fifteen, the other twenty-one kilogrammes. The aeorilite [sic] appeared to proceed, as is very often the case, from a small black cloud. The smaller fragment fell upon a house, pierced the roof, struck a beam which caused it lo deviate slightly from its course, passed through a ceiling composed of white clay and straw, and entered a room where several persons were assembled, but fortunately, noone was hurt. A circumstance worthy of remark was, that the straw of the ceiling traversed by the meteor was not in the least carbonized: it only appeared of a brighter yellow, with semi-metalic lustre; pieces of straw even adhering to the stone, presented no trace of carbonization. A fragment has been analysed by M. Fischer, of Breslau, who found in it, besides sulphuretted iron, carbon, phosphorus and bromine. In sawing the mass, globules were inflamed by the friction of the teeth of the saw, and a bright light produced. Literary Gazette. __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
