Beryl

Be3Al2SiO6 - Mohs Hardness: 7 1/2 - 8.  The most important physical properties of beryl are those that determine its usefulness as a gem. Color and clarity are very important. Beryl occurs in a diversity of colors, with some of those colors being highly desirable. It also occurs in transparent crystals that have clarity and size that are sufficient for faceting. Many beryls have a color that can be improved by heating.
Abstract/Description: Be3Al2SiO6 - Mohs Hardness: 7 1/2 - 8. The most important physical properties of beryl are those that determine its usefulness as a gem. Color and clarity are very important. Beryl occurs in a diversity of colors, with some of those colors being highly desirable. It also occurs in transparent crystals that have clarity and size that are sufficient for faceting. Many beryls have a color that can be improved by heating.
Subject(s): Nevada, United States
environmental sciences