Emerald - Wikipedia

Emerald is a gemstone and a variety of the mineral beryl (Be 3 Al 2 (SiO 3) 6) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5–8 on the Mohs scale. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor. Emerald is a cyclosilicateCrystal habit: Massive to well Crystalline…

Emerald Aisle® National Car Rental

When you arrive at the location, go directly to the Emerald Aisle or Executive area in US and Canada. Choose your own car. Choose any make, model and color at the reserved Midsize rate. The keys are in the cars. United States. Arizona. Phoenix. Phoenix Sky Harbor Intl. Airport. California.…

Emerald: The World's Most Popular Green Gem, May Birthstone

Emerald's Green Color. Beryl, the mineral of which emerald is a variety, has a chemical composition of Be 3 Al 2 (SiO 3) 6.When pure, beryl is colorless and known as "goshenite." Trace amounts of chromium or vanadium in the mineral cause it to develop a green color. Trace amounts of iron will tint emerald a bluish green or a yellowish green color depending upon its oxidation state.…