LL Group
This group represents the least common
class of ordinary chondrites since it
includes just about 1,100 members
(again, including probable pairings).
The "LL" stands for "low iron" and "low
metal" reflecting that LL chondrites
usually contain a weight percentage of
19 to 22% total iron, but only 1 to 3%
free metal. Hence, they are only weakly
attracted to a magnet.
Like the other ordinary chondrites, the
LL chondrites show petrologic types from
1 - 7, but the distribution of types
shows no distinct peak. The most common
LL chondrites are LL6 and LL5 with about
400 members each. More unequilibrated
types such as LL4 and LL3 are much more
rare with just about 70 members each.
The olivine in LL chondrites is more
iron-rich than in the other ordinary
chondrites, and this implies that the LL
chondrites must have formed under more
oxidizing conditions than the H or L
chondrites. Older literature lists the
LL chondrites often as "amphoterites"
since they were thought to be a
connecting link between chondrites and
achondrites, but this name is misleading
and no longer in use.
Scientists are still searching for a
probable parent body for the LL group.
One small main belt asteroid, 3628
Boznemcová, has been spotted which
exhibits a similar reflectance spectrum
to the spectra of the LL chondrites, but
with a diameter of just 7 km it seems to
be too small to be regarded as the
original parent body of the LL members.
Maybe it's just a fragment of a common
ancestor which links the LL chondrites
to 3628 Boznemcová, and further research
will still have to find the real source
of the LL chondrites within the dense
population of NEOs crossing Earth's
orbit.
| Kilabo LL6
Nigeria
Fell 2002 July
21, 19:30 hrs local time
Ordinary
chondrite (LL6)
TKW : 19 kg
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Kilabo 00
40.19 gr
A really nice complete and
fresh witness fall !!!
SOLD
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Kilabo 01
10.96 gr
A nice small
individual witness fall !!!
160 $
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Kilabo 02
9.84 gr
Just a desirable small
complete piece!!!
$ 150
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Kilabo 03
5.37 gr
Small and
nice individual !
$ 80
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Kilabo 04
5.42 gr
Another chance to get this
very nice witnes fall !!!
for only 80 $
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Kilabo 05
4.66 gr
small
complete piece with fresh
fusion crust "Looking
to be adopted by a nice
collector :-) "
SOLD
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Kilabo 06
3.54 gr
Tiny and so pretty
individual !
for only 55 $
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Kilabo 07
3.37 gr
Very nice and
desirable fresh meteorite !
SOLD
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Kilabo 08
3.38 gr
An other complete piece
recovered of fusion crust !
for only 50 $
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