Copy 2

The naturalist's and traveller's companion, containing instructions for discovering & preserving objects of natural history and for promoting inquiries after human knowledge in general / [Anon].

  • Lettsom, John Coakley, 1744-1815.
Date:
1774
Catalogue details

Licence: Public Domain Mark

Credit: The naturalist's and traveller's companion, containing instructions for discovering & preserving objects of natural history and for promoting inquiries after human knowledge in general / [Anon]. Source: Wellcome Collection.

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    an ore of this metal, from which ultramarine is prepared. c- Mountain-green, “ Copper united with earth, diffolved by an acid.” d. Glafs copper ore, hard and brittle, ufually found with native copper, of a purple or brown color. e. Grey copper ore, mineralized with fulphur alone, foft fo as to be cut by a knife. t. Copper pyrites or mundic, yellowifh or greenifh ^ ct Copper mineralized with iron, and frequently with a fmall proportion of arfenic ^ marcahtical.” Shews the rainbow colors. g. White copper pyrites, “ mineralized with iulphur, iron, and a conliderable proportion of arfenic.” Copper ores are found in moll countries, par¬ ticularly in Sweden, Hungary, and Tranfyl- yania. Japan alio affords a fine fort of copper. B. Iron is about eight times heavier than water, is attracted by one of its ores called the load-ftone; ioluble in all acids, alkaline folu- tions, water and air. Its foliation is turned of a black or dark purple color, by galls and vegetable aftringents. a. In moft clays and ochres, from which thefe earths and moft precious ftones receive their color. It may be even extra&ed from the afhes of moft animal and vegetable fubftances by burning. b. Iron ochre, found in the fiffures of iron mines, and at the bottom of chalybeate fprings. c. Blood ftone, or ruddle, (Haematites) red, brown or grey, containing a large proportion of iron, but is not attracted by the magnet. d. Chryftalline