出典:Wiktionary
The Queensland town takes its name from the emerald and other precious stone deposits in the area and from the pastoral run Emerald Downs, a name chosen circa 1860 by pastoralist Peter Fitzallan MacDonald.[1][2] It is unclear if emeralds were found in or around Emerald.
The given name is a modern coinage from the name of the gemstone, representing a vernacular form of Esmeralda.[3]
Emerald
出典:Wikipedia
出典:『Wikipedia』 (2011/07/07 23:41 UTC 版)
Emerald is a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5–8 on the 10 point Mohs scale of mineral hardness. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor.