Descriptions of Two Meteorites: Karoonda

was seen by many observers in South Australia. A meteorite fell near Karoonda, a small settlement some 75 miles due east of Adelaide. It was found two weeks later in a sandy, fallowed wheat field by a search party from the University ofAdelaide and Adelaide Observatory. The meteorite evidently consisted of a single stone which shattered on impact with the ground; some 92 pounds of fragments were collected, the largest weighing 7 pounds. The circumstances of the fall and the discovery were described by Grant and Dodwell (1931). The mineralogy and petrology of the meteorite were described by Mawson (1934), who published an analysis by A. R. Alderman. Mawson recognized that Karoonda was a chondritic meteorite of an unusual type, containing little or no nickel-iron, and he classified it as a chondritic asiderite. Wahl (1950) pointed out that Alderman's analysis showed an improb-ably high amount of A1203 (5.55%). In view of this and in view of the unusual mineralogy of the meteorite, we decided to re-analyze and redescribe this unusual meteorite. The piece investigated (A.M.N.H. No. 3903) was obtained by exchange from the South Australian Museum