Acapulcoites
The name of this small group of primitive achondrites is derived from
its only witnessed fall, the meteorite of Acapulco that fell in Mexico in
1976. Since its composition is nearly chondritic, Acapulco was initially
classified as an anomalous chondrite, although it does not contain any
relict chondrules. However, when similar meteorites were subsequently
found, the acapulcoite group was formed to describe a distinct class of
primitive achondrites. Acapulcoites mark the transition between primordial
chondritic matter and more differentiated rocks. The acapulcoite group
presently comprises 12 members, if one excludes probable pairings.
Acapulcoites are composed primarily of fine-grained olivine,
orthopyroxene, minor plagioclase, nickel-iron metal, and the iron sulfide,
troilite. They have mineral compositions that are intermediate between
those of E and H chondrites, but they exhibit a characteristic oxygen
isotopic pattern distinct from all other known chondrite groups.
Importantly, some acapulcoites have been shown to contain a few relict
chondrules such as the meteorite of Monument Draw, Texas, and one member
actually exhibits an abundance of distinct chondrules - our recent find
from Tissemoumine, Morocco, officially named NWA 725. This unique
acapulcoite is actually a scientific sensation, and it is one of our best
finds. The presence of distinct chondrules within NWA 725 attests to the
fact that the acapulcoites represent an extremely primitive group, a true
transition between chondrites and achondrites. It is thought that they
originated on the same parent body as the closely related lodranites,
another class of primitive achondrites.
NWA 725 - Tissemoumine
Found May 2000, Morocco
TKW 3.8 kg
Acapulcoite
Contains relics chondrules!
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NWA 725 -00
complete fresh individual !!
has a small open widow for testing
SOLD
Price
on request |
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NWA 725 -01
complete fresh individual !!
121.1gr
Price
on request
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NWA 725 -02
part slice with crust
4.42 gr
SOLD
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NWA 725 -03
full slice, fully crusted......
3.30gr
SOLD
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NWA 725 -04
full slice, crusted + relic chondrules...
2.63gr
Sold
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NWA 725 -05
full slice with many relic chondrules
3.00gr
SOLD
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NWA 725 -06
half individual with open window
SOLD
Price on
request
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NWA 725 -07
large crusted full slice, a very good specimen
41.22gr
Price
on request
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NWA 725 -08
thick endcut with crust on the edge !
89.25 gr
Price
on request
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NWA 725 -09
thick piece with crust
34.25gr
SOLD
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NWA 725 - 10
thick piece of acapulcoite
18.67 gr
SOLD
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NWA 725 -11
Nice slice with crust
5.28 gr
SOLD
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NWA 725 -12
Nice slice with crust
6.10 gr
SOLD
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More slices available, ask for your size !!!
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