The blowpipe vade macum : the blowpipe characters of minerals deduced from the original observations of Aquilla Smith ; alphabetically arranged and edited by Samuel Haughton and Robert H. Scott / [Aquilla Smith].

  • Aquilla Smith
Date:
1862
Catalogue details

Licence: Public Domain Mark

Credit: The blowpipe vade macum : the blowpipe characters of minerals deduced from the original observations of Aquilla Smith ; alphabetically arranged and edited by Samuel Haughton and Robert H. Scott / [Aquilla Smith]. Source: Wellcome Collection.

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    Iron, crystallized OUgiste (Th. 434.)—Isle of Elba. Yields with some difficulty to the knife. Hardness = 5’5; streak red. Feebly attracted by the magnet. In the forceps fuses with difficulty on the edge, [throwing out brilliant scintillations, if the experimenter understand the use of his blowpipe—En.], and becomes strongly magnetic. With borax it dissolves slowly into an olive-yellow glass. Iron Earth, blue, (subsesquiphosphate of Iron).—Cornwall. Yields to the nail; streak blue. It fuses readily into a metallic-looking glo- bule ; magnetic when well roasted. Contains much water. With borax it fuses speedily into a glass coloured by iron. Iron, hydrous oxide of ( Heniatite, brown). (Th.320).—Restormal Mine, near Lostwithiel, Cornwall. Not magnetic. Brittle; hardness = 5-0 ; streak yellowish-brown. In the forceps fuses on the edge without difficulty, and in a strong heat scintillates; it becomes strongly magnetic. Contains water. Iron, magnetic oxide, fasciculated columnar.—Bohemia, or Franconia. Before roasting, and in a good heat, fuses into a black magnetic scoria. Contains water. It is very remarkable for its magnetic property. Iron, massive phosphate of.—North America. Streak bluish. In the forceps it decrepitates ; but if slowly heated, it fuses readily into a black globule. This appears to be the Mullicite of Thomson, p. 452. Iron Ore, bog (Ph. 222).—North of Ireland. Hardness about = 3-5. Powder yellowish-brown. In the forceps blackens, fuses readily on the edge, and becomes magnetic. Contains much water. Iron Ore, lamellar specular.—Arinahincha, county Cork. Not mag- netic. Yields to the knife. Powder dark red; veiy thin laminoe ' transmit a blue-red light, when viewed with a lens. In the forceps it fuses on the edge, and becomes magnetic. Iron, oxydulated, (magnetic Oxide).—Haytor Mine, Dartmoor, De- vonshire. Brittle; hardness = 5‘5 ; powder black. Attracted by the magnet, but does not attract iron filings. In the forceps, in a strong heat, it fuses on the edge, into a steel-grey mass, but a small frag- ment forms a bead with great difficulty. With borax fuses rather readily into a glass deeply coloured by iron. Iron, phosphate of (Vivianite), (Th. 455).—Dobschau, Hungary. Yields very easily to the knife ; hardness = 1'5 ; streak blue. In the forceps it fuses very readily into a greenish-black globule, with a metallic lustre, which becomes magnetic when well roasted. Con- tains much water. With borax it fuses speedily into a glass co- loured by iron. It contains no manganese. Iron Pjrrites, magnetic (Ph. 213).—Hardness about = 4'5. Powder greyish-black. On charcoal it emits the smcU of sulphurous acid, and fuses readily into a globule, brilliant while hot, greyish-black and rough when cold. It is attracted by the magnet, both before and after roasting. ^ , tt ^ Iron, radiated carbonate of.—Eannioak, Gicenland. Haidness—4 , streak white. Does not effervesce with cold muriatic acid; dissolves with effervescence in warm acid. In the forceps it blackens, and be-
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