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.

________________________________________________________________________ I.

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.

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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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