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.
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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 :-) "
$ 70
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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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