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. Steatite [.Mg]^{6}[...Si]^{5} + 4[.H] c. Gilbertite [...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] ________________________________________________________________________ TABLE II. _______________________________________________________________________ | Analcime | If transparent becomes white and opaque when heated, | but on incipient fusion resumes its transparency and | then fuses to a clear glass. | Andalusite | When powdered and treated with cobalt solution on | charcoal, assumes a blue color. | Apophyllite | Fuses to a frothy white glass. | 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 potassa. | Beryl | Sometimes gives a chromium reaction in borax and | microcosmic salt. | Chabasite | Fuses to a white enamel. | Chondrodite | Evolves fluorine in the glass 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 | assumes a blue color. | Datholite | Fuses to a clear glass and colors the flame green. | Diallage | Frequently gives off water in small quantity. | 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 potassa. It contains both sulphur and | sulphuric acid. | Hypersthene | As Diallage. | Kyanite | As Andalusite. | Lapis Lazuli | Fuses to a white glass, and when treated with carbonate | of soda on charcoal, gives the sulphur reaction on | silver. | Laumonite | When strongly heated, exfoliates and curls up. |