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Chemical Diffusion in Watermelon Tourmaline : Parallel Versus Perpendicular to C-axis
The chemical composition of tourmaline can provide unique insights into the thermal evolution of their growth environment, including that of pegmatites (in igneous systems) and hydrothermal veins (in metamorphic systems). ...
Color in Watermelon Tourmaline : The Role of Hydroxyl Diffusion
Tourmaline is a semiprecious gemstone known in the geologic community known for its complex chemical formula. This is because the crystal structure of tourmaline can incorporate and contain numerous elements from the ...
The Distribution of Hydrous Impurities in Quartz : The Role of Twinning
Quartz crystals have been studied since ancient times by scientists and natural philosophers attempting to unlock the mysteries behind their aesthetic appearance and cryptic morphological properties. Previous studies ...
Color Variation in Gemmy Amethyst : The Role of Contaminant Diffusion
The role of contaminant diffusion purple quartz, otherwise known as amethyst, is commonly known for its occurrence as clusters of gemmy crystals that grow on the walls of fluid-filled fractures and vugs in hydrothermal ...