tourmalin

It has long been known, that a siliceous stone called the tourmalin, when its surfaces are polished, if it be laid down before the fire, will become electrified with vitreous, or what is called positive electricity on its upper surface; and resinous, or what is called negative electricity on its under surface; which I suppose lay in contact with somewhat which supported it near the fire.

The Temple of Nature; or, the Origin of Society A Poem, with Philosophical Notes Erasmus Darwin 1766

a siliceous stone called the tourmalin, when its surfaces are polished, if it be laid down before the fire, will become electrified with vitreous, or what is called positive electricity on its upper surface; and resinous, or what is called negative electricity on its under surface; which I suppose lay in contact with somewhat which supported it near the fire.

Note XII 1803

Carlos del Rio Negro, and the Peak of Duida, the granite is traversed by numerous veins of different ages, abounding with rock-crystal, black tourmalin and pyrites.

Travels to the Equinoctial Regions of America 1851

Peak of Duida, the granite is traversed by numerous veins of different ages, abounding with rock-crystal, black tourmalin and pyrites.

Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3 Alexander von Humboldt 1814

By heat and by decomposition; the tourmalin; cats; galvanic pile; evaporation of water.

Contents 1803

By heat and by decomposition; the tourmalin; cats; galvanic pile; evaporation of water.

The Temple of Nature; or, the Origin of Society A Poem, with Philosophical Notes Erasmus Darwin 1766

The tourmalin has lately been brought much into notice by its remarkable property of becorfiing

The Economy of Nature Explained and Illustrated: On the Principles of Modern Philosophy. By G ... 1798

Sometimes the quartz presents a large surface covered with a crust of a fine black substance; at first sight, this matter would be taken for manganese, but by attentive observation, it ap - pears to be nothing more than the substance of tourmalin itself, in a state of confused crystallization.

Transactions of the American Philosophical Society 1771

In this experiment I suppose the tourmalin to be naturally combined with resinous electric ether like glass; which on one side next towards the fire by the increase of its attractive power, owing to the heat having loosened its combination with the earth of the stone, more strongly attracts vitreous electric ether from the atmosphere; which now stands on its surface: and then as the lower surface of the stone lies in contact with the hearth, the less quantity of vitreous ether is there repelled by the greater quantity of it on the upper surface; while the resinous ether is attracted by it: and the stone is thus charged like a coated jar with vitreous electric ether condensed on one side of it, and resinous on the other.

Note XII 1803

In this experiment I suppose the tourmalin to be naturally combined with resinous electric ether like glass; which on one side next towards the fire by the increase of its attractive power, owing to the heat having loosened its combination with the earth of the stone, more strongly attracts vitreous electric ether from the atmosphere; which now stands on its surface: and then as the lower surface of the stone lies in contact with the hearth, the less quantity of vitreous ether is there repelled by the greater quantity of it on the upper surface; while the resinous ether is attracted by it: and the stone is thus charged like a coated jar with vitreous electric ether condensed on one side of it, and resinous on the other.

The Temple of Nature; or, the Origin of Society A Poem, with Philosophical Notes Erasmus Darwin 1766