IRON – STONY IRONS
About 3% of all known meteorites.
There are basically two types of Stony-Irons:
a mixture in roughly equal parts of metal (iron-nickel) and silicates (pyroxene, olivine, plagioclase).
they contain crystallized, sometimes gemmy, grains of olivine within an iron-nickel matrix
About 27% of all known meteorites.
Three main types and many sub-types:
the most common, they contain 7% to 15% nickel and show a clear Widmanstatten pattern when etched.
They contain more than 15% nickel and
show no Widmanstatten pattern.
They contain very little nickel and may show some parallel lines,
the Neumann lines when etched.