KREEPn.
/kriːp/ A substance found on the moon as glassy fragments and as a constituent of fines and breccias, characterized by a high content of potassium, phosphorus, and rare-earth elements and unusually little iron.
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the world > the earth > minerals > types of mineral > other miscellaneous minerals > [noun]
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adamantinec1225
adamant stonea1387
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diaspore1802
sideroclepte1814
allagite1823
spherulite1823
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xanthitane1856
belonite1865
aenigmatite1868
opacite1875
viridite1879
neocyanite1882
sideronatrite1882
wittite1924
niggliite1936
anthonyite1963
perryite1965
KREEP1971
1971 Sci. News Let. 23 Jan. 62 Another Apollo 12 find..was that of an exotic component called KREEP by some—for high content of potassium, rare earth elements and phosphorus—found in rock 13.
1971 N. J. Hubbard et al. in Earth & Planetary Sci. Lett. X. 343/1 We will refer to this distinctive glass as KREEP glass (from its distinctive potassium, rare-earth element, and phosphorus content).
1971 Geochim. et Cosmochim. Acta Suppl. 2 I. 393 Hubbard et al. (1971a) designated this class of material as the KREEP component.
1971 Geochim. et Cosmochim. Acta Suppl. 2 I. 398 Breccias with glass matrices..are the most abundant form of KREEP in the soil samples.
1973 McGraw-Hill Yearbk. Sci. & Technol. 284/2 The activity fell off smoothly in the adjacent regions to the east and west, including the other near-side maria... The localization of the high U-Th regions indicates a restricted distribution of KREEP (a potassium, rare-earth, phosphate-bearing phase), with which the high U-Th component is associated in returned lunar samples.
This entry has not yet been fully updated (first published 1976; most recently modified version published online June 2018).
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n.1971