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FIGURE 1: Kamacite (top) and troilite
(bottom). Note how the
metal and silicates are
intermixed (large amounts of metal-silicate interface).
Magnification: [20-0.80-4.0]
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FIGURE
2: Kamacite with Neumann
lines. Many of the slip
lines
exhibit a slight curvature
indicative of plastic
deformation after shock.
The identity of the
lightly-etched/stained mineral
to the left is undetermined.
Magnification: [20-0.80-4.0]
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FIGURE
3: Kamacite with curved Neumann
lines.
Magnification: [20-1.00-4.0] |
FIGURE
4:
Zoned taenite showing an outer
taenite rim, cloudy zone, and a
martensite interior.
Magnification: [100-0.80-4.0]
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FIGURE
5: Kamacite
(with Neumann bands) intergrown
with silicate minerals.
Magnification: [20-0.80-4.0]
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FIGURE
6: Mixture of
zoned taenite + troilite + tetrataenite
+ copper.
This curious but common
texture represents a
low-temperature modification of the original
zoned taenite cloudy structure. Evidence of localized
shock-melting?
Magnification: [100-1.00-4.0]
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FIGURE
7: Zoned
taenite showing an outer taenite
rim, cloudy zone, and a
martensite interior.
Magnification: [50-0.80-4.0] |
FIGURE
8: Zoned
taenite showing an outer taenite
rim, cloudy zone, and a
martensite interior.
Magnification: [50-1.00-4.3]
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FIGURE
9: Zoned
taenite showing an outer taenite
rim, cloudy zone, and a
martensite interior.
Curiously, the taenite
substructure is asymmetrical
with the outer taenite rim and
cloudy zone structures
completely missing from the
bottom of the metal particle.
Magnification: [50-1.00-4.0] |
FIGURE 10: Kamacite containing deformed
Neumann bands. The
identity of the
lightly-etched/stained mineral
to the upper right is
undetermined.
Magnification: [20-0.80-4.0]
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FIGURE 11:
Kamacite
with troilite inclusion.
Magnification: [20-0.80-4.0]
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FIGURE 12:
Kamacite
with Neumann bands.
Magnification: [20-0.80-4.0]
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FIGURE 13:Mixture of
zoned taenite, troilite,
tetrataenite, and copper.
This is a curious but common
textures that represents a
modification of the original
zoned taenite cloudy structure
at low temperatures.
Evidence of localized
shock-melting?
Magnification: [50-0.80-4.0]
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FIGURE 14: Kamacite
with deformed
Neumann bands. The
identity of the
lightly-etched/stained mineral
at the bottom is
undetermined.
Magnification: [20-0.80-4.0] |
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FIGURE 15:Zoned
taenite (upper left) and
troilite (lower right).
Near the bottom of the zoned
taenite, the original cloudy
structure has decomposed into a
mixture of tetrataenite and
kamacite. Note the wide outer
taenite rim where the metal
touches troilite.
Magnification: [50-0.80-4.0]
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FIGURE 16:
Zoned
taenite showing an outer taenite
rim, cloudy zone, and a
martensite interior.
Magnification: [50-0.80-4.5]
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FIGURE 17:
Taenite grains
(polycrystalline). The grain to
the left contains numerous
troilite blebs and the cloudy
structure has decomposed to a
mixture of kamacite and
tetrataenite.
Magnification: [20-1.00-4.5] |
FIGURE 18:
Close-up of the decomposed
taenite region showing
tetrataenite + kamacite +
troilite intergrowth.
Magnification: [50-1.00-4.5]
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