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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    G-arnet, yellow manganesian.—Franklin Furnace, Sussex, New Jersey. Resists the knife. In the forceps fuses readily into a shining black globule. No water. With borax dissolves slowly into a glass co- loured by iron; when nitre is added, and again heated, the glass becomes deep purple. Gehlenite (Th. 281; Al. 161).—From Mount Monzoni in the Valley of Fassa, in the Tyrol. Scarcely yields to the knife; streak white. In the forceps fuses rather slowly on the edge, with some ebullition, into a muddy green glass, a very small fragment fuses into a head. Contains a little water. With borax fuses slowly into a colourless glass, indicating a little iron while warm; with biphosphate of soda fuses slowly into a clear glass, which becomes opaline when cold, and leaves a skeleton of silica undissolved. This specimen does not gelatinize when reduced to powdex', and moistened with nitric acid. Thompson asserts it does. Gibbsite ( Vide Alumina, hydrated). Gieseckite (Th. 382; Al. 100).—AkuUiarasiarksuk, Greenland. Yields readily to the knife; streak white. In the forceps whitens; and in a good blast fuses on the edge into a white enamel. With borax it effervesces a little at first, and fuses very slowly into a colourless glass, indicating iron while it is warm. Rare. Gilbertite (Th. 235).—Cornwall. Yields easily to the knife; sectile. . In the forceps fuses slowly on the edge into a white enamel. Trace of water. With borax emits a few bubbles, and fuses slowly into a colourless glass; with acetate of cohalt, a deep blue. Gmelinite {Vide Hydrolite). (Th. 340; Al. 119).—Island Magee, county Antrim. Yields rather easily to the knife; hardness 4‘5; streak white. In the forceps partly falls to powder, then fuses quietly hut slowly into a white blebby glass, semi-transparent when intensely heated. Contains much water. With borax fuses readily, leaving a skeleton which dissolves slowly; does not gelatinize with nitric acid. Grenatite (Th. 279 ; Al. 202).—Manetsok, North Greenland. Scarcely jfields to the knife. In the forceps it is infusible, but in a thin fragment blackens, and glazes a little in a good blast. Not magnetic after roasting. With borax effervesces a little, and is scarcely soluble. [Ghrenatite.—Fuses with extreme difficulty, on the edge, turning black; and with borax, dissolves very slowly, with slight effervescence at first Ed.] Halloysite (Th. 239 ; Al. 73)—Angleur, near Liege, France. Adheres to the tongue. Yields to the nail, and receives a polish from it; brittle. In the forceps it becomes first brown, then white; and is almost infusible ; a thin edge glazes in a good blast. Contains much water. With borax it is nearly insoluble. Heated with nitrate of cobalt, it becomes blue on the edge. Harmotome.—Strontian, Argyleshire. Yields rather easily to the knife. In the forceps, when roasted, it becomes white and opaque, and very F