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Lewis Cliff 88763 meteorite (LEW 88763), Lewis Cliff, Buckley Island quadrangle, Transantarctic Mountains, Eastern Antarctica, Antarcticai
Regional Level Types
Lewis Cliff 88763 meteorite (LEW 88763)Meteorite Fall Location
Lewis CliffCliff
Buckley Island quadrangleQuadrangle
Transantarctic MountainsMountain Range
Eastern AntarcticaRegion
AntarcticaContinent

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Key
Latitude & Longitude (WGS84):
84° 14' 44'' South , 161° 24' 5'' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:


Primitive achondrite meteorite, anomalous (FeO-rich)
Found, 1988; 4.1 g

Lewis Cliff 88763 (LEW 88763) is a very small [2 x 1.6x 0.6 cm], fine-grained achondritic meteorite. The olivine-rich (~70 vol%) meteorite is almost completely covered by a thin fusion crust (200-50 µm). The Olivine (Fo63-64) is somewhat iron-rich and is accompanied by Ni-rich metal, but overall composition is near chondritic as is typical of all primitive achondrites. Small amounts (~5-6%) of pyroxene (mostly Ca-poor), albitic plagioclase [~7-8%], chromite, ilmenite, troilite, and merrillite are also reported. Both plagioclase and sparse phosphates are unevenly distributed. A crude ~ 25 Ma cosmic ray exposure age and high Ne21/22 ratios suggest that LEW 88763 was either a very small body < 30 cm in diameter or lay very near the surface of a meteoroid before its encounter with the earth. The thin fusion crust (one side 200 µm thick, the other 50 µm) also is consistent with the breakup of a very small meteoroid during atmospheric entry. A Kr-Ar 4.5 age indicate crystallization during the very early solar system. [There is, however, no Xe-129 excess.]

Moderate (grade B) weathering has produced some Fe-oxides and isotopic alterations that, along with unevenly distributed phases, circumscribe the precision of some analyses.

In spite of textural similarities to the olivine-rich brachinites, LEW 88763 does not appear to be closely related to other primitive achondrites (e.g., Brachina, Acapulco, Taffasset) when all of the usual measures for parent body affinities [oxygen isotopes, REE systematics, Al/Ga & Fe/Mn ratios, ages] are used. For now, then, LEW 88763 may be the sole representative of an unknown parent body.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


7 valid minerals.

Meteorite/Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Albite-Anorthite Series'
Description: Mostly albitic (Ab55-74; Or2-7).
Reference: Swindle, T.D. & 4 others (2001) Noble gases, bulk chemistry, and petrography of olivine-rich meteorites: Comparison to Brachinites. Meteoritics & Planetary Science 33 (1): 31-48. (Jan 2001). ; Day, J.M.D. & 5 others (2015) Differentiation process in FeO-rich asteroids revealed by the achondrite Lewis Cliff 88763 . Meteoritics & Planetary Science 50 (10): 1750-1766. (Oct 2015).
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Description: Unzoned[Wo38En46Fs16].
Reference: Swindle, T.D. & 4 others (2001) Noble gases, bulk chemistry, and petrography of olivine-rich meteorites: Comparison to Brachinites. Meteoritics & Planetary Science 33 (1): 31-48. (Jan 2001).
Chromite
Formula: Fe2+Cr3+2O4
Reference: Swindle, T.D. & 4 others (2001) Noble gases, bulk chemistry, and petrography of olivine-rich meteorites: Comparison to Brachinites. Meteoritics & Planetary Science 33 (1): 31-48. (Jan 2001). ; Day, J.M.D. & 5 others (2015) Differentiation process in FeO-rich asteroids revealed by the achondrite Lewis Cliff 88763 . Meteoritics & Planetary Science 50 (10): 1750-1766. (Oct 2015).
'Fayalite-Forsterite Series'
Reference: Swindle, T.D. & 4 others (2001) Noble gases, bulk chemistry, and petrography of olivine-rich meteorites: Comparison to Brachinites. Meteoritics & Planetary Science 33 (1): 31-48. (Jan 2001). ; Day, J.M.D. & 5 others (2015) Differentiation process in FeO-rich asteroids revealed by the achondrite Lewis Cliff 88763 . Meteoritics & Planetary Science 50 (10): 1750-1766. (Oct 2015).
Ilmenite
Formula: Fe2+TiO3
Reference: Swindle, T.D. & 4 others (2001) Noble gases, bulk chemistry, and petrography of olivine-rich meteorites: Comparison to Brachinites. Meteoritics & Planetary Science 33 (1): 31-48. (Jan 2001).
Merrillite
Formula: Ca9NaMg(PO4)7
Reference: Swindle, T.D. & 4 others (2001) Noble gases, bulk chemistry, and petrography of olivine-rich meteorites: Comparison to Brachinites. Meteoritics & Planetary Science 33 (1): 31-48. (Jan 2001).
'Orthopyroxene Subgroup'
Reference: Day, J.M.D. & 5 others (2015) Differentiation process in FeO-rich asteroids revealed by the achondrite Lewis Cliff 88763 . Meteoritics & Planetary Science 50 (10): 1750-1766. (Oct 2015).
Pigeonite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Description: Olivine-&-Pigeonite in approximate Mg-Fe equilibrium.
Reference: Swindle, T.D. & 4 others (2001) Noble gases, bulk chemistry, and petrography of olivine-rich meteorites: Comparison to Brachinites. Meteoritics & Planetary Science 33 (1): 31-48. (Jan 2001).
Taenite
Formula: (Fe,Ni)
Reference: Swindle, T.D. & 4 others (2001) Noble gases, bulk chemistry, and petrography of olivine-rich meteorites: Comparison to Brachinites. Meteoritics & Planetary Science 33 (1): 31-48. (Jan 2001).
Troilite
Formula: FeS
Reference: Swindle, T.D. & 4 others (2001) Noble gases, bulk chemistry, and petrography of olivine-rich meteorites: Comparison to Brachinites. Meteoritics & Planetary Science 33 (1): 31-48. (Jan 2001). ; Day, J.M.D. & 5 others (2015) Differentiation process in FeO-rich asteroids revealed by the achondrite Lewis Cliff 88763 . Meteoritics & Planetary Science 50 (10): 1750-1766. (Oct 2015).

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Taenite1.AE.10(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Ilmenite4.CB.05Fe2+TiO3
Group 8 - Phosphates, Arsenates and Vanadates
Merrillite8.AC.45Ca9NaMg(PO4)7
Group 9 - Silicates
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Pigeonite9.DA.10(CaxMgyFez)(Mgy1Fez1)Si2O6
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Orthopyroxene Subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Taenite1.1.11.2(Fe,Ni)
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
(AB)3(XO4)2
Merrillite38.3.4.4Ca9NaMg(PO4)7
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Pigeonite65.1.1.4(CaxMgyFez)(Mgy1Fez1)Si2O6
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Orthopyroxene Subgroup'-

List of minerals for each chemical element

OOxygen
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O ChromiteFe2+Cr23+O4
O IlmeniteFe2+TiO3
O MerrilliteCa9NaMg(PO4)7
O Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
NaSodium
Na MerrilliteCa9NaMg(PO4)7
MgMagnesium
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg MerrilliteCa9NaMg(PO4)7
Mg Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
SiSilicon
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
PPhosphorus
P MerrilliteCa9NaMg(PO4)7
SSulfur
S TroiliteFeS
CaCalcium
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca MerrilliteCa9NaMg(PO4)7
Ca Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
TiTitanium
Ti IlmeniteFe2+TiO3
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe ChromiteFe2+Cr23+O4
Fe IlmeniteFe2+TiO3
Fe Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe Taenite(Fe,Ni)
Fe TroiliteFeS
NiNickel
Ni Taenite(Fe,Ni)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Lindstrom, M. (1991) Antarctic meteorite newsletter 14 (2): p.22. NASA/Johnston Space Center: Houston.
Swindle, T.D. & 4 others (2001) Noble gases, bulk chemistry, and petrography of olivine-rich meteorites: Comparison to Brachinites. Meteoritics & Planetary Science 33 (1): 31-48. (Jan 2001).
Day, J.M.D. & 5 others (2015) Differentiation process in FeO-rich asteroids revealed by the achondrite Lewis Cliff 88763 . Meteoritics & Planetary Science 50 (10): 1750-1766. (Oct 2015).

External Links


Other Regions, Features and Areas containing this locality

Antarctic MeteoritesGroup of Meteorite Fall Locations
Antarctic PlateTectonic Plate

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