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Book X lapis sabinicus, lapis selentinus, lapis liparaeus and other mixtures of stone, metal and earth

Book X lapis sabinicus, lapis selentinus, lapis liparaeus and other mixtures of stone, metal and earth Page of 251 Book X lapis sabinicus, lapis selentinus, lapis liparaeus and other mixtures of stone, metal and earth Text size:minus plus Restore normal size   Mail page  Print this page
BOOK X
221
make a sound when the stone is shaken, for example, the callimus in geodes. In some places the stones adhere to the interior of the geode and make no sound when shaken. A stone may contain many stones such as the gems in the round Motschean geodes that are soft, of many species, and adhering to the Avails. The Megarian conchites stone contains many shells.
Even though a compound substance contains an abundance of metal, any earth, congealed juice, or stone adhering to it will change the com­position. So much concerning compound substances that consist of two simple natural substances.
I shall now discuss compound substances containing two mixed sub­stances. Any of the six genera of mixed substances may be combined with any other. There are just as many species of these genera of com­pound substances as there are different compositions. For example, if the compound contains a species of the first mixed genus, a sulphurous, bi­tuminous, or some other species, the addition of any species of any of the other five genera will change the composition. If the compound substance contains, in abundance, the first genus and species of the second genus are added to it a great variety of compounds are possible, since, in the second genus we have mixed auriferous stones, two species of argentif­erous and three species of plumbiferous, cupriferous and ferruginous stones. Each species, as if a genus, embraces many other species. For ex­ample, argentiferous stones include the silver minerals that are gray, lead-gray, red, black, white, yellow, liver-colored, and the color of pumice. Any one of these may adhere to a sulphurous stone. Likewise particles of the species of the third to fifth genera may adhere to species of the first genus and produce a great many different compounds. There are as many if not more species in these other genera than in the first genus although they are all known by the same name with the exception of galena, pyrite, cadmia, and stibnite that belong to the fifth genus. Finally, if particles of species of the sixth genus are added to species of the first genus they will change the composition. For example, atramentiferous pyrite may com­bine with an atramentiferous stone. Thus numerous compound substances may be produced by combining species of the second to sixth genera with other species of any of these genera.
I shall now discuss compound substances containing a simple and a mixed substance. First, an earth may contain a particle of one of the species of the first mixed genus or the particle may adhere to it. A sul­phurous, bituminous, or some other such stone will change the composi­tion of an earth. The same is true of combinations of the other genera. I shall discuss species of the second genus since these are known by the same names as those of the other genera and also because more metal is re­covered from them than from the species of the other genera. Although metal is recovered from the latter species, for the sake of brevity I shall not discuss them. An earth may embrace a mixed auriferous, two species
Book X lapis sabinicus, lapis selentinus, lapis liparaeus and other mixtures of stone, metal and earth Page of 251 Book X lapis sabinicus, lapis selentinus, lapis liparaeus and other mixtures of stone, metal and earth
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