title: Viking magnetic properties investigation: further results.
abstract: The amounts of magnetic particles held on the reference test chart and backhoe magnets on lander 2 and lander 1 are comparable, indicating the presence of an estimated 3 to 7 percent by weight of relatively pure, strongly magnetic particles in the soil at the lander 2 sampling site. Preliminary spectrophotometric analysis of the material held on the backhoe magnets on lander 1 indicates that its reflectance characteristics are indistinguishable from material within a sampling trench with which it has been compared. The material on the RTC magnet shows a different spectrum, but it is suspected that the difference is the result of a reflectance contribution from the magnesium metal covering on the magnet. It is argued that the results indicate the presence, now or originally, of magnetite, which may be titaniferous.
authors.forename: R B
authors.initials: RB
authors.lastname: Hargraves
authors.forename: D W
authors.initials: DW
authors.lastname: Collinson
authors.forename: R E
authors.initials: RE
authors.lastname: Arvidson
authors.forename: C R
authors.initials: CR
authors.lastname: Spitzer