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NOME X. BASALTIN, WITH STEATITE.

[BACONITE, from Roger Bacon, the greatest chemist of the middle ages; flourished A. D. 1240.]

This differs from Saussurite, or magnesian basaltin, because the particles of steatite may be partly distinguished by the naked eye. It is found in the isle of Mull, and in some other countries.

HYPONOME I.

With steatite disseminated.

HYPONOME II.

The same, with globules.

NOME XI. SLATE, WITH SILEX.

[LULLITE, from Raymond Lully, A. D. 1300.]

This kind has been described by Mr. Kirwan*. Sometimes the quartz seems the most

i. 381.

considerable part of the combination; but the rock still preserves the slaty appearance.

NOME XII. SLATE, WITH MAGNESIA.

[VALENTINITE, from Basil Valentine (his real name see Dufresnoy, i. 229), A. D. 1410.]

This substance is commonly to be distinguished by its unctuous or silky appearance. The magnesia sometimes assumes the form of small scales, as at Holyhead, where it is also sometimes invested with a crust of foliated steatite, and sometimes includes masses of pure talc and amianthus*. The same interesting spot likewise presents schistose siderite, penetrated with talc or micarel. It has commonly layers of quartz between the plates of siderite.

Level..

HYPONOME I.

HYPONOMe 11.

Undulated.

Kirwan i. 382.

NOME XIII. SLATE, WITH LIME.

[PALISSITE, from Bernard Palissy, a potter of surprising genius and intuition, A. D. 1580*.]

This mixture is found where the slate joins the lime-stone, either primitive or secondary.

HYPONOME 1.

Slate, containing lime.

HYPONOME II.

Lime-stone, with particles of slate.

NOME XIV. QUARTZ, WITH IRON.

[HELMONTITE, from Helmont, A. D. 1620.]

The most remarkable kind, the eisenkiesel, or iron-flint of the Germans, is only found in veins, and belongs to lithology, or the study of the smaller stones. But rocks of quartz and keralite sometimes occur, intimately combined with iron, in whole or in part.

[blocks in formation]

NOME XV. QUARTZ, WITH BASALTIN.

[TORRICELLITE, from Torricelli, A. D. 1640.]

This is a scarce rock, and may rather be referred to the mixture of siderite with quartz.

NOME XVI. QUARTZ, WITH SLATE.

[GLAUBERITE, from Glauber, A. D. 1650.]

A diamictonic rock, composed of quartz, impregnated with slate*.

NOME XVII. QUARTZ, WITH FELSPAR.

[GUSRICITE, from Otto von Guerick, A. D. 1660.]

Saussure has described a rock of this nature, the particles being so combined, that it could not be said to belong to either substance.

Sauss. §1955.

NOME XVIII. KERALITE, WITH CHLORITE. [KUNKELITE, from Kunkel, A. D. 1660.]

This combination often forms the green keralite, one of the most pleasing appearances of that substance.

NOME XIX. SCHISTOSE KERALITE AND SLATE.

[BOY LITE, from Boyle, A. D. 1660.]

The colour is grey, of a greater or less tendency to blue.

NOME XX. SCHISTOSE KERALITE AND LIME-STONE.

[BECCHERITE, from Beccher, the great founder of modern chemistry, whose Physica Subterranea appeared at Frankfort, 1669.]

This seems chiefly to happen where the primitive lime-stone joins the schistose keralite.

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