It is important to note that shatter cones are only produced in a high velocity impact (like cause by meteorites and the like ) or by nuclear explosions . Other shock effects are multiple planar deformation features of silicate materials notably Stishovite . High mineral phases of feldspar are also formed . The presence of these high-pressure forms of minerals is indicative that a crater is formed by impacts from objects from outer space (aside from those created by nuclear explosion . In ordinary volcanic...
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