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

Beryl....

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.

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.

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

Leucite

Some varieties, when treated with cobalt solution, assume a blue color.

Meerschaum In the glass 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, assumes a pink color.

Olivine ... Some varieties give off fluorine, when fused with micro

cosmic salt.

Pectolite.... Similar to Apophyllite.

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

As Chabasite.

Pycnite..... Assumes 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 quantity of lithia, and colors the flame red when fused with fluorspar and bisulphate of potassa.

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 potassa.

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.