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. ❋ 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. ❋ Unknown (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. ❋ Unknown (1851)
Peak of Duida, the granite is traversed by numerous veins of different ages, abounding with rock-crystal, black tourmalin and pyrites. ❋ Alexander Von Humboldt (1814)
By heat and by decomposition; the tourmalin; cats; galvanic pile; evaporation of water. ❋ Unknown (1803)
The tourmalin has lately been brought much into notice by its remarkable property of becorfiing ❋ Unknown (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. ❋ Unknown (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. ❋ Unknown (1803)
"The present craze of Society women is for Chinese pink jade and tourmalin. ❋ Unknown (1907)
She was [feeling] very [exotic], so she used a tourmaline for [pleasuring ones self]. ❋ That One Guy Who Came Up With (2018)
[The electrical] properties of [tourmaline] make it great for pressure [guages], and it feels great crammed into my balloon knot. ❋ Hlalakar (2020)
