Iron-Stony Irons

IRON – STONY IRONS

STONY IRONS
About 3% of all known meteorites.
There are basically two types of Stony-Irons:

MESOSIDERITES:
a mixture in roughly equal parts of metal (iron-nickel) and silicates (pyroxene, olivine, plagioclase).

PALLASITES:

they contain crystallized, sometimes gemmy, grains of olivine within an iron-nickel matrix



IRON METEORITES
About 27% of all known meteorites.
Three main types and many sub-types:

OCTAHEDRITES:
the most common, they contain 7% to 15% nickel and show a clear Widmanstatten pattern when etched.

ATAXITES:

They contain more than 15% nickel and
show no Widmanstatten pattern.

HEXAHEDRITES:

They contain very little nickel and may show some parallel lines,
the Neumann lines when etched.

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