Hundreds of 'Rock Crystals' Found From a 6000-Yr-Old Site Indicate Quartz Fragments Were Used to Decorate Graves The burial practices of ancient populations have always intrigued researchers because ...

Pure quartz, or “rock crystal” from Brazil ... Quartz is the second-most abundant mineral in the continental crust, and is present both as visible crystals, ranging in size from immense ...

Unlike mineral particles found in clouds on Earth, the quartz crystals detected in the clouds of WASP-17 b are not swept up from a rocky surface. Instead, they originate in the atmosphere itself.

Large crystals found in geodes and other rocks are relatively rare ... Silicates—including quartz, mica, olivine, and precious minerals such as emeralds—are the most common class of minerals ...

Whether you're really into rocks or just quartz-curious, Kansas City has a source for the minerals, crystals and fossils you ...

Right: OH-defects in young (0.3 Gyr) Variscan granites are one order of magnitude higher than in old (0.9-1.8 Gyr) Proterozoic granites from Scandinavia . The OH-content is reflected in recent ...