Members Only Content
The 2016 convention team appreciates your help promoting the National Speleological Society! We have prepared some web banners that may be used by any internal organizations of the society to support the 75th anniversary celebration in July of 2016.
If your region or grotto maintains a website, please consider linking to our convention site using these graphics. You'll have to log in to see them and download the code though - this material is only meant to be used on websites representing the society's many internal organizations.
Mainly clear. Lows overnight in the upper teens.
Mainly clear. Low 17F. Winds SSE at 5 to 10 mph.
Sunny, along with a few afternoon clouds. High near 50F. Winds E at 5 to 10 mph.
Last updated on
Mon, 1-Jan 7:45 pm
Beryl is a mineral that contains a significant amount beryllium. Beryllium is a very rare metal and that limits the occurrence of beryl to a few geological situations where beryllium is present in sufficient amounts to form minerals. It mainly occurs in in granite and granite pegmatites, but can also be found where carbonaceous shale, limestone, and marble have been acted upon by regional metamorphism.
The hexagonal crystals of beryl may be very small or range to several meters in size. Terminated crystals are relatively rare. Pure beryl is colorless, but it is frequently tinted by impurities; possible colors are green, blue, yellow, red, and white.