|
PEGMATITE Pegmatite is a very course grained plutonic igneous rock. The grain size must be 20mm or more. The appearance of a pegmatite is distinct as the large crystals embedded within the host rock often have a strong contrast in colors and textures. Pegmatites may contain gemstones such as corundum (ruby and sapphire), tourmalines (such as elbaite and schorl), beryls (such as emerald and aquamarine), and topaz. |
|
See Steve's video interview about asteroid capture at Moonandback: Part 1 Part 2 Part 3 |
|---|
See Steve's blog Ramblings On The Future Of Humanity (recent post) A Project Plan for Space Based Solar Power
|
Copyright ©1995-2014 by Amethyst Galleries, Inc.
Site design & programming by galleries.com web services