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
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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![CUAltACTEHS OF inNIMl.VLP. O') cheny-red when liot, green on cooling, and colourless when cold.— Ed.] Tourmaline, green.—Chesterfield, America. Resists the knife. In the forceps it fuses on the edge, with slight intumescence, into a grej’ish- white rough enamel. Ro water. With borax it effervesces at first, breaks up, and fuses quickly into a clear glass, coloured by iron tvhile warm; with nitrate of potash, manganese is made apparent. Tourmaline, green.—Killiney, county Dublin. Characters same as last: not so much manganese. Treniolite, asbestiform (Hornblende). (Th. 194; Al. 147).— Camhorne, Gornw'all. Hardness = 4'5. In the forceps fuses, on the edge, with difficulty into a greenish glass, with scarcely any effer- escence. No water. With borax emits some bubbles, and fuses slowly into a colourless glass. Tremolite, crystallized (Th. 194; Al. 145).—St. Gothard. Hardness about = 5'0. In the forceps, in the inner flame, fuses on the edge, with some effervescence and intumescence, into a blebby white glass, rendered more transparent in a strong heat; and a small fragment forms a bead with difficulty. No wmter. With borax emits a few bubbles, and fuses rather readily into a glass slightly coloured by iron. TriphyUne.—^Bodenmais, Bavaria. Hardness about = 5 ; streak white. In the forceps fuses readily into an iron-black globule, feebly at- tracted by the magnet; in a stronger heat the assay spreads over the points of the forceps; heated with some of Turner’s test (bisulphate of potash, four and a half parts; fiuor spar, one part), it tinges the flame red. Contains very little water. With borax dissolves speedily into a glass deeply coloured by iron. With nitre it indicates man- ganese. Turquoise ( Ffde Calaite). Uranium, oxydulous (Th. 268).—Hardness = 5'5 ; streak black. Infu- sible , glazes a little in a stz'ong heat. Contains a good deal of water. With borax it emits some bubbles, and dissolves readily; in the outer flame it is gieenish, and contains numerous black flocculi; in the inner flame it becomes clearer and of a darker colour. Voltzine ( Vide Zinc oxysulphuret). (Th, 540).—Lanescot Wine, Corn- wall. Hardness = 5‘0—5’5; streak white. Decrepitates \*iolently even when reduced to powder and moistened ; it deposits on the charcoal a powder, yellow while w'ai-m. Contains no water. With borax it bleaks up into minute pieces, and dissolves slowly into a glass, co- lourless while warm, which exhibits milky sti-eaks when'cold’; by careful flaming it may be made more opaque ; in the inner flame it remains transparent when cold, and cannot be made opaque again without a fresh portion of the assay being added. Rare. This ap- pears to be the mammillated blende of Phillips; sec his Mineralogy Third Edition, page 353. ’](https://iiif.wellcomecollection.org/image/b24878583_0063.jp2/full/800%2C/0/default.jpg)
