6533b7d3fe1ef96bd126137a

RESEARCH PRODUCT

Der meteorit von Breitscheid—III petrographische untersuchung

subject

description

Abstract The meteorite of Breitscheid is a grey-veined bronzite-olivine-chondrite containing nickel-iron and troilite. It has a remarkably high volume of pores of about 10 per cent. The density of the solid is 3·7, of the stone as a whole 3.3. The chondrules take about 20 per cent of the volume of the stone. The ore minerals are: nickel-iron (kamacite and taenite), troilite, chromite, ilmenite and besides, in the melting crust, magnetite. Especially ilmenite—until recently doubtful as a constituent of meteorites—could be proved in a convincing manner. The silicate constituents are: olivine, bronzite, clinopyroxene, plagioclase (?), glass and a few minerals which could not be identified. The mineral composition and the fabric are described. In addition the mineral composition, calculated by chemical analysis, is given. It is remarkable that troilite appears in two varieties one of which evidently is secondary, because it is always embedded in nickel-iron in a metasomatic manner.