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Ceniceros   contributed by jnmczurich, IMCA 2391   MetBul Link


Roll Overs:     #1   #2   #3   #4   #5   #6   #7    


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154.3 gram end cut. 85 x 63 x 33 mm.   L3.7

TKW 1025 grams. Observed fall 20 August 1988, Durango, Mexico.

   


Jürgen / jnmczurich writes:
Ceniceros is a nice H3.7 chondrite with an interesting inside. The shown 154.3 g end section is the largest remaining part of the former 1025 g individual.

The close-up views are about 8x6 mm. The large dark "inclusion" is a Radial Pyroxene chondrule.

Thin section pictures taken with cross-polarized filter. The thin section is 16 x 10 mm.

Dealer trade: 1989
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Photo 6

Photo 7

Found at the arrow (green or red) on the map below

 


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John Divelbiss
 5/3/2018 10:23:57 AM
Interesting...question for both of you and others, "what would your guestimate be if L or H if you only had the thin section?"...as we can see in pics 3 and 4. I see the higher metal areas that does have somewhat of a darker-stained 'H' look to it, but the other areas and the overall chondrule size suggests a 'L' designation, at least to me at first glance.
Juergen / jnmczurich
 5/3/2018 9:09:34 AM
Hi Bernd, good point. It seems, that H3.7 is the old classification, used until 2003 and I overlooked the classification change. Metbase 7.2 gives following information: *Reclassified from H to L chondrite based on magnetic susceptibility measurement and mineral analysis, P. Rochette et al. MAPS, 2003, 38, p. 251, see in Table 3, p. 261. However, the Metbase 7.2 reference also mentioned a total iron content of 29.1 wt.% in Ceniceros. This is pretty high iron content for a L chondrite.
Bernd Pauli
 5/3/2018 6:47:58 AM
My database entry also classifies it as an H3.7 but the Met.Bull. recommends L3.7. Juergen, what would you say? Does chondrule size speak in favor of an H3.7 or an L3.7?
 

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