. Birds and nature . sia. It does not re-tain its color by artificial light as doestrue Turquois and may be further dis-tinguished by giving off an offensiveodor when heated, owing to decomposi-tion of animal matter. Further, it islighter than true Turquois and does notgive a blue color with ammonia whendissolved in hydrochloric acid, as doestrue turquois. The finest Turquoises have long comefrom Persia, from a locality not far fromNishapur, in the province of Khorassan,Here the mineral occurs in narrow seamsin the brecciated portions of a porphyritictrachyte and the surrounding clay
. Birds and nature . sia. It does not re-tain its color by artificial light as doestrue Turquois and may be further dis-tinguished by giving off an offensiveodor when heated, owing to decomposi-tion of animal matter. Further, it islighter than true Turquois and does notgive a blue color with ammonia whendissolved in hydrochloric acid, as doestrue turquois. The finest Turquoises have long comefrom Persia, from a locality not far fromNishapur, in the province of Khorassan,Here the mineral occurs in narrow seamsin the brecciated portions of a porphyritictrachyte and the surrounding clay are several hundred mines in theregion and the entire population of thetown of Maaden derives its livelihoodfrom mining and cutting the stones. Itis said that $40,000 worth of stones aretaken from these mines annually. Apound of stones of the first quality sellsat the mines for about $400 and is worthmore than double that price in are other Turquois mines in Per-sia, but their product is comparatively.
Size: 1485px × 1683px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, books, booksubjectnaturalhistory
