Accession Number : AD0726143

Title :   Size Classification of Mars Simulation Samples.

Descriptive Note : Research memo.,

Corporate Author : GRUMMAN AEROSPACE CORP BETHPAGE N Y RESEARCH DEPT

Personal Author(s) : Egan,Walter G.

Report Date : JUN 1971

Pagination or Media Count : 28

Abstract : A detailed physical analysis was made of a particulate sample (1.19-2.38 mm A.S.T.M. sieve range Venango County, Pa. limonite) shown previously to produce the best optical and physical match to the Martian bright areas. An A.S.T.M. sieve size range as a particulate specification is an ambiguous parameter, and inadequate to describe the particulates when a subsidiary distribution of fines occurs. The 1.19-2.38 mm limonite particles are actually flake shaped, with an overcoating of <0.5 micrometer diameter platelet particles; the flake shaped particles have over-all length, width, and thicknesses of 3.44, 2.83, and 1.16 mm, respectively, and a specific surface area of 0.077 meter squared (determined from a B.E.T. calculation). This specific surface area is 70 times the projected area of the particles, and could be caused by less than 1 percent by weight, relative to the 1-2 mm particles, of an equivalent <1 micrometer limonite powder. Scanning electron microscope photographs revealed a surface roughness between 0.02 micrometer and 10 micrometers. (Author)

Descriptors :   (*MARS(PLANET), ROCK), IRON OXIDES, ELECTRON MICROSCOPY, INFRARED SPECTROSCOPY, SIMULATION

Subject Categories : Astrophysics
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE