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An encyclopedic survey that first catalogs marine animals, algae, and shellfish, describing habitats, curious behaviors, reported antipathies, and numerous folk remedies and practical uses attributed to specific species, organized by ailments and applications. The later portion treats metals and their ores—including gold, silver, mercury, copper, and brass—describing modes of occurrence, extraction, alloying, testing, gilding, and decorative and monetary uses, alongside technical observations and medicinal remedies derived from metallic substances, with systematic lists and practical instructions interwoven throughout.
For sapphiros,3159 too, is refulgent with spots3160 like gold. It is also of an azure colour, though sometimes, but rarely, it is purple; the best kind being that which comes from Media. In no case, however, is this stone diaphanous; in addition to which, it is not suited for engraving when intersected with hard particles of a crystalline3161 nature. Those among them that have the colour of cyanos are generally thought to be the male stones.