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):
Report Date:
1971-06-01
Pagination or Media Count:
28.0
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
Subject Categories:
- Astrophysics
- Geology, Geochemistry and Mineralogy