A Popular Treatise On Gems in Reference to Their Scientific Value a Guide Fo
A Popular Treatise On Gems in Reference to Their Scientific Value a Guide Fo
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This mineral was first brought into notice by Baron Humboldt, who found it in Mexico.
It occurs massive ; has a conchoidal fracture ; is trans- parent ; of strong vitreous lustre ; color, hyacinth-red, run- ning into honey, wine-yellow, showing carmine-red and greenish reflections ; sometimes containing dendritic draw- ings. Its specific gravity is 2 '02 ; loses one and a half per cent, by calcination, and leaves pale flesh-red fragments. It is found in the trachytic porphyry, in Mexico, and in... the amygdaloid of the Faroe Islands.
As the fire opal is very little known, it has not yet been employed in jewelry, but bids fair to find applica- tions. It is ground on a leaden wheel with emery, and polished with rotten-stone on a wooden wheel. The forms of cabochon, table, or pavilion, might suit very well as ring- stones.
The cabinet of the university of Bonn possesses a very large and fine fire opal, of the size of the fist. The largest specimen I have seen is in the royal mineral ogical cabinet at Berlin, which was deposited by Baron Humboldt on his return from South America, and which, if I recollect it well enough from the year 1827, must be at least six inches long and four inches thick.
What to read after A Popular Treatise On Gems in Reference to Their Scientific Value a Guide Fo?
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To quickly assess the difficulty of the text, read a short excerpt:
This mineral was first brought into notice by Baron Humboldt, who found it in Mexico.
It occurs massive ; has a conchoidal fracture ; is trans- parent ; of strong vitreous lustre ; color, hyacinth-red, run- ning into honey, wine-yellow, showing carmine-red and greenish reflections ; sometimes containing dendritic draw- ings. Its specific gravity is 2 '02 ; loses one and a half per cent, by calcination, and leaves pale flesh-red fragments. It is found in the trachytic porphyry, in Mexico, and in... the amygdaloid of the Faroe Islands.
As the fire opal is very little known, it has not yet been employed in jewelry, but bids fair to find applica- tions. It is ground on a leaden wheel with emery, and polished with rotten-stone on a wooden wheel. The forms of cabochon, table, or pavilion, might suit very well as ring- stones.
The cabinet of the university of Bonn possesses a very large and fine fire opal, of the size of the fist. The largest specimen I have seen is in the royal mineral ogical cabinet at Berlin, which was deposited by Baron Humboldt on his return from South America, and which, if I recollect it well enough from the year 1827, must be at least six inches long and four inches thick.
What to read after A Popular Treatise On Gems in Reference to Their Scientific Value a Guide Fo?
You can find similar books in the "Read Also" column, or choose other free books by Lewis Feuchtwanger to read onlineMoreLess
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