A System of Instruction in the Practical Use of the Blowpipe Part 34

Nephrite ([.Ca][.Mg][.Fe])^{4}[...Si]^{3}? Int.

Wollastonite [.Ca]^{3}[...Si]^{2} c. Iolite ([.Mg][.Fe])^{3}[...Si]^{2} + 3[...Al=][...Si]

IV.

a. Beryl [...Be][...Si]^{2} + [...Al=][...Si]^{2} b. Diallage ([.Ca][.Mg][.Fe])^{3}([...Si][...Al=])^{2} Hypersthene ([.Mg][.Fe])^{3}[...Si]^{2} c. Fuchsite ([.K]^{5}[...Si])^{2} + 9([...Al=][...Cr=])^{6}[...Si]^{6} V.

a. Leucite [.K]^{3}[...Si]^{2} + [...Al=][...Si]^{2} b. Chondrodite ([.Mg],[.Mg]F)^{4}([...Si]SiF^{3}) Olivine ([.Mg][.Fe][.Ca])^{2}[...Si]

c. Andalusite ([...Al=]Fe)^{3}[...Si]^{2} Chrysoberyl [...Be] + [...Al=]

Kaynite [...Al=]^{3}[...Si]^{2} Pycnite 6[...Al=]^{3}[...Si]^{2} + (3[...Al=]F^{3} + 2[...Si]F^{3}) Topaz 6[...Al=]^{3}[...Si]^{2} + (3[...Al=]F^{3} + 2[...Si]F^{3}) Zircon [...Zr=][...Si]

Staurolite ([...Al=]Fe)^{2}[...Si]

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Hydrous Silicates.

________________________________________________________________________ Fus. alone and with NaC.

Mineral. Formula.

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a. a.n.a.lcime [.Na]^{3}[...Si]^{2} + 3[...Al=][...Si]^{2} + 6[.H] Int.

Apophyllite ([.K], KF)([...Si], SiF^{3}) + 6[.Ca][...Si] + 15[.H] Int.

Brewsterite ([.Sr][.Ba])[...Si] + [...Al=][...Si]^{3} + 5[.H] Int.

Chabasite ([.Ca],[.Na],[.K])^{3}[...Si] + 3[...Al=][...Si]^{2} + 18[.H] Int.

Lapis Lazuli [...Si],[...S],[...Al=], Fe, [.Ca], [.Na], [.H]

Laumonite [.Ca]^{3}[...Si]^{2} + 3[...Al=][...Si]^{2} + 12[.H] Int.

Mesotype ([.Na][.Ca])[...Si] + [...Al=][...Si] + 3[.H] Int.

Natrolite [.Na][...Si] + [...Al=][...Si] + 2[.H] Int.

Prehnite [.Ca]^{2}[...Si] + [...Al=][...Si] + [.H] Int.

Scolezite [.Ca][...Si] + [...Al=][...Si] + 3[.H] Int.

Thomsonite ([.Ca][.Na])^{3}[...Si] + 3[...Al=][...Si]

+ 7[.H] Int.

Datholite 2[.Ca]^{3}[...Si] + [...B]^{3}[...Si]^{2} + 3[.H] Int.

Heulandite [.Ca][...Si] + [...Al=][...Si]^{3} + 5[.H] Int.

Stilbite [.Ca][...Si] + [...Al=][...Si]^{3} + 6[.H] Int.

b. Okenite [.Ca]^{3}[...Si]^{4} + 6[.H] Int.

Pectolite ([.Ca][.Na])^{4}[...Si]^{3} + [.H] Int.

c. Saponite 2[.Mg]^{3}[...Si]^{2} + [...Al=][...Si]

+ 10 or 6[.H]

II.

a. Antrimolite 3([.Ca][.K])[...Si] + 5[...Al=][...Si] + 15[.H]

Harmatome [...Ba][...Si] + [...Al=]S^{2} + 5[.H]

b. Brevicite [.Na][...Si] + [...Al=][...Si] + 2[.H]

Orthite [.R]^{3}[...Si] + [...R=][...Si] + ([.H]?) Int.

III.

c. Pitchstone [...Si],[...Al=], Fe, [.Mg][.Na], [.K][.H]

Talc to V. [.Mg]^{6}[...Si]^{5} + 2[.H]

Chlorite 3([.Mg]Fe)^{3}[...Si] + ([...Al=]Fe)^{2}[...Si]

+ 9[.H]

Pinite [...Si],[...Al=],[.Fe],[.K],[.Mg],[.H]

IV.

a. Steat.i.te [.Mg]^{6}[...Si]^{5} + 4[.H]

c. Gilbert.i.te [...Si],[...Al=],[.Fe],[.Mg],[.H] Int.

Meerschaum [.Mg][...Si] + [.H] Serpentine [.Mg]^{9}[...Si]^{4} + 6[.H] V.

a. Gismondine ([.Ca][.K])^{2}[...Si] + 2[...Al=][...Si] + 9[.H]

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TABLE II.

_______________________________________________________________________ a.n.a.lcime If transparent becomes white and opaque when heated, but on incipient fusion resumes its transparency and then fuses to a clear gla.s.s.

Andalusite When powdered and treated with cobalt solution on charcoal, a.s.sumes a blue color.

Apophyllite Fuses to a frothy white gla.s.s.

Axinite Imparts a green color to the blowpipe flame, owing to the presence of boracic acid. This reaction is especially distinct, if the mineral be previously mixed with fluorspar and bisulphate of pota.s.sa.

Beryl Sometimes gives a chromium reaction in borax and microcosmic salt.

Chabasite Fuses to a white enamel.

Chondrodite Evolves fluorine in the gla.s.s tube, both when heated alone and with microcosmic salt. It sometimes also gives off a trace of water.

Chrysoberyl Is unattacked by carbonate of soda. With nitrate of cobalt on charcoal the finely powdered mineral a.s.sumes a blue color.

Datholite Fuses to a clear gla.s.s and colors the flame green.

Diallage Frequently gives off water in small quant.i.ty.

Fuchsite Gives the chromium reaction with borax and microcosmic salt.

Gadolinite That from Hitteroe, if heated in a partially covered platinum spoon to low redness, glows suddenly and brilliantly.

Hauyne Affords the sulphur reaction both on charcoal and when fused with pota.s.sa. It contains both sulphur and sulphuric acid.

Hypersthene As Diallage.

Kyanite As Andalusite.

Lapis Lazuli Fuses to a white gla.s.s, and when treated with carbonate of soda on charcoal, gives the sulphur reaction on silver.

Laumonite When strongly heated, exfoliates and curls up.

Lepidolite Colors the blowpipe flame crimson, from lithia; also gives the fluorine reaction with microcosmic salt.

Leucite Some varieties, when treated with cobalt solution, a.s.sume a blue color.

Meerschaum In the gla.s.s bulb frequently blackens and evolves an empyreumatic odor due to organic matter. When this is burnt off, it again becomes white, and if moistened with nitrate of cobalt solution and heated, a.s.sumes a pink color.

Okenite Behaves as Apophyllite.

Olivine Some varieties give off fluorine, when fused with microcosmic salt.

Pectolite Similar to Apophyllite.

Petalite Imparts a slight crimson color to the flame, like Lepidolite.

Prehnite As Chabasite.

Pycnite a.s.sumes a blue color, when treated with nitrate of cobalt. Gives the fluorine reaction with microcosmic salt.

Pyrope Gives the chromium reaction with borax and microcosmic salt.

Scolecite Similar to Laumonite, but more marked.

Scapolite Occasionally contains a small quant.i.ty of lithia, and colors the flame red when fused with fluorspar and bisulphate of pota.s.sa.

Sodalite If mixed with one-fifth its volume of oxide of copper, moistened to make the mixture cohere, and a small portion placed upon charcoal and heated with the blue oxidizing flame, the outer flame will be colored intensely blue from chloride of copper.

Spodumene When not too strongly heated, colors the blowpipe flame red, when more strongly, yellow.

Stilbite As Chabasite.

Topaz When heated, remains clear. Otherwise as Pycnite.

Tourmaline Gives the boracic acid reaction with flourspar and bisulphate of pota.s.sa.

Wollastonite Colors the blowpipe flame faintly red from lime.

Zircon The colored varieties become white or colorless and transparent, when heated. Is only slightly attacked by carbonate of soda.

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