tephrite
geology
Quick Summary
Tephrite is an extrusive igneous rock characterized by the presence of calcium-rich plagioclase feldspar, feldspathoid (typically nepheline), olivine, and pyroxene. It is closely related to basanite, differing by the absence of olivine. Tephrite and basanite commonly appear as gray to black rocks found in volcanic flows and sheets. These rocks have been identified in various locations worldwide, including Germany, Italy, Portugal, Greenland, Uganda, and Colorado.1
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