Glass with embedded metal and sulfides (GEMS) are tiny spheroids in cosmic dust particles with bulk compositions that are approximately chondritic. They form the building blocks of anhydrous interplanetary dust particles (IDPs) in general, and cometary IDPs, in particular. Their compositions, mineralogy and petrography appear to have been shaped by exposure to ionizing radiation. Since the exposure occurred prior to the accretion of cometary IDPs, and therefore comets themselves, GEMS are likely either solar nebula or presolar interstellar grains. The properties of GEMS (size, shape, mineralogy) bear a strong resemblance to those of interstellar silicate grains as inferred from astronomical observations.
Famous quotes containing the words glass, embedded and/or metal:
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—For the State of Florida, U.S. public relief program (1935-1943)
“The idea of feminine authority is so deeply embedded in the human subconscious that even after all these centuries of father-right the young child instinctively regards the mother as the supreme authority. He looks upon the father as equal with himself, equally subject to the woman’s rule. Children have to be taught to love, honor, and respect the father.”
—Elizabeth Gould Davis (b. 1910)
“We are supposed to be the children of Seth; but Seth is too much of an effete nonentity to deserve ancestral regard. No, we are the sons of Cain, and with violence can be associated the attacks on sound, stone, wood and metal that produced civilisation.”
—Anthony Burgess (b. 1917)