0018933 These results are being reported primarily for record purposes. C2. Particle Characteristics The majority of the particles were translucent white and had an irregular shape. Some flaky aggregates, small spheres apparently formed by condensation, and clusters of varying sizes were also present. Many of the larger particles were discolored with a reddish-brown stain, presumably due to iron oxide. The main constituents were identified as Ca(OH), and CaCO, (both calcite and aragonite) by examination with polarized light and by X-ray diffraction. Small quantities of ocean water salts were observed in all the samples, The particles disintegrated spontaneously into many small fragments when brought into contact with liquids. The disintegration was most rapid with water, but also occurred at a slower rate with hydrocarbons and other fluids, Due to this effect, their density could not be determined by the brombenzene-bromoform method. Size measurement and type classification were described in Section 2.4; this investigation is summarized in Table C.2. 117 aN PREM