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Lewis Cliff 87232 meteorite (LEW 87232), Lewis Cliff, Buckley Island quadrangle, Transantarctic Mountains, Eastern Antarctica, Antarcticai
Regional Level Types
Lewis Cliff 87232 meteorite (LEW 87232)Meteorite Fall Location
Lewis CliffCliff
Buckley Island quadrangleQuadrangle
Transantarctic MountainsMountain Range
Eastern AntarcticaRegion
AntarcticaContinent

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Key
Latitude & Longitude (WGS84):
84° 20' 30'' South , 161° 23' 35'' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:


K Chondrite (K3)
Find, 1987; 23.1 g

LEW 87232 was recovered as a small rounded stone with small patches of its fusion crust still remaining on one side. It appeared to be even more weathered at its center than at its exterior. Chondrules, fragments, and rounded metal regions are dispersed in the fine-grained, yellowish matrix which accounts for ~70 vol% of the meteorite. Chondrules (ave. diameter < 0.5 mm) are mostly porphyritic pyroxenes (PP), but olivine may be poikilitically enclosed in some chondrules and a few others are olivine-rich. As is true of all members of the small K chondrite grouplet, both the olivine (Fo98.8) and pyroxene (enstatite, clinoenstatite, and Ca-rich pyroxene) are extremely Mg-rich. Fe-Ni metal spheroids — referred to as 'chondrules' by Weisberg — may have originally accounted for ~10-20% of the meteorite. Small amounts of apatite and schreibersite are associated with the Fe-Ni metal. Opaques include the kamacite and taenite of the metal and troilite. Very minor amounts of spinel/pyroxene-rich material in tiny inclusions are also reported.

Lewis Cliff 87232 is one of the only four K (Kakangari-like) Chondrites known as of mid 2015. The prototype, Kakangari, is itself quite small (~340 g), but it still accounts for ~80% of the ~420 total K chondrite mass. Thus the three small and weathered finds present some difficult issues for precise classification. However, LEW 87232 olivine is seemingly less variable [Fa 0.6-2.0], but still incompletely equilibrated and its chondrules more Mg-rich than Kakangari (K3) so, it is listed here as petrographic type K3 along with Kakangari and Lea County 002. The more recent 2014 find, NWA 10085, has been listed as petrologic type K4.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


8 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: An albitic plagioclase grain [An19] was identified.
Reference: Score, R. & Lindstrom, M. [eds.] (1992) Petrologic Descriptions: Antarctic Meteorite Newsletter 14 (2): page 24. (Sept 1992).; Weisberg, M. K. & 5 others (1993) Petrology and Stable Isotopes of LEW 87232, A New Kakangari-type Chondrite: Meteoritics 28(3): 458-459. (July 1993).
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Reference: Weisberg, M. K. & 5 others (1993) Petrology and Stable Isotopes of LEW 87232, A New Kakangari-type Chondrite: Meteoritics 28(3): 458-459. (July 1993).
Clinoenstatite
Formula: MgSiO3
Reference: Brearley, A. J. & Jones, R. H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
Enstatite
Formula: Mg2Si2O6
Description: Enstatite in matrix & as laths rimming Fe-Ni metal.
Reference: Brearley, A. J. & Jones, R. H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
'Fayalite-Forsterite Series'
Reference: Score, R. & Lindstrom, M. [eds.] (1992) Petrologic Descriptions: Antarctic Meteorite Newsletter 14 (2): page 24. (Sept 1992).; Weisberg, M. K. & 5 others (1993) Petrology and Stable Isotopes of LEW 87232, A New Kakangari-type Chondrite: Meteoritics 28(3): 458-459. (July 1993).; Brearley, A. J. & Jones, R. H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
Forsterite
Formula: Mg2SiO4
Description: Most or all of the Olivine is highly forsteritic, with Fe undetectable in some instances.
Reference: Brearley, A. J. & Jones, R. H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
Iron
Formula: Fe
Reference: Weisberg, M. K. & 5 others (1993) Petrology and Stable Isotopes of LEW 87232, A New Kakangari-type Chondrite: Meteoritics 28(3): 458-459. (July 1993).; Brearley, A. J. & Jones, R. H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
Iron var: Kamacite
Formula: (Fe,Ni)
Reference: Weisberg, M. K. & 5 others (1993) Petrology and Stable Isotopes of LEW 87232, A New Kakangari-type Chondrite: Meteoritics 28(3): 458-459. (July 1993).; Brearley, A. J. & Jones, R. H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Score, R. & Lindstrom, M. [eds.] (1992) Petrologic Descriptions: Antarctic Meteorite Newsletter 14 (2): page 24. (Sept 1992).
'Pyroxene Group'
Description: Both Ca-poor (enstatite, Clinoenstatite) and Ca-rich Pyroxene present.
Reference: Score, R. & Lindstrom, M. [eds.] (1992) Petrologic Descriptions: Antarctic Meteorite Newsletter 14 (2): page 24. (Sept 1992).; Weisberg, M. K. & 5 others (1993) Petrology and Stable Isotopes of LEW 87232, A New Kakangari-type Chondrite: Meteoritics 28(3): 458-459. (July 1993).
Schreibersite
Formula: (Fe,Ni)3P
Reference: Weisberg, M. K. & 5 others (1993) Petrology and Stable Isotopes of LEW 87232, A New Kakangari-type Chondrite: Meteoritics 28(3): 458-459. (July 1993).
Spinel
Formula: MgAl2O4
Reference: Brearley, A. J. & Jones, R. H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
Taenite
Formula: (Fe,Ni)
Reference: Weisberg, M. K. & 5 others (1993) Petrology and Stable Isotopes of LEW 87232, A New Kakangari-type Chondrite: Meteoritics 28(3): 458-459. (July 1993).; Brearley, A. J. & Jones, R. H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
Troilite
Formula: FeS
Reference: Brearley, A. J. & Jones, R. H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Iron1.AE.05Fe
var: Kamacite1.AE.05(Fe,Ni)
Schreibersite1.BD.05(Fe,Ni)3P
Taenite1.AE.10(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
Spinel4.BB.05MgAl2O4
Group 9 - Silicates
Clinoenstatite9.DA.10MgSiO3
Enstatite9.DA.05Mg2Si2O6
Forsterite9.AC.05Mg2SiO4
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Fayalite-Forsterite Series'-
'Limonite'-(Fe,O,OH,H2O)
'Pyroxene Group'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Iron
var: Kamacite
1.1.11.1(Fe,Ni)
Schreibersite1.1.21.2(Fe,Ni)3P
Taenite1.1.11.2(Fe,Ni)
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
Group 7 - MULTIPLE OXIDES
AB2X4
Spinel7.2.1.1MgAl2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Forsterite51.3.1.2Mg2SiO4
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Clinoenstatite65.1.1.1MgSiO3
Enstatite65.1.2.1Mg2Si2O6
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Fayalite-Forsterite Series'-
Iron-Fe
'Limonite'-(Fe,O,OH,H2O)
'Pyroxene Group'-

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
H ApatiteCa5(PO4)3(Cl/F/OH)
OOxygen
O Limonite(Fe,O,OH,H2O)
O ApatiteCa5(PO4)3(Cl/F/OH)
O ClinoenstatiteMgSiO3
O EnstatiteMg2Si2O6
O ForsteriteMg2SiO4
O SpinelMgAl2O4
FFluorine
F ApatiteCa5(PO4)3(Cl/F/OH)
MgMagnesium
Mg ClinoenstatiteMgSiO3
Mg EnstatiteMg2Si2O6
Mg ForsteriteMg2SiO4
Mg SpinelMgAl2O4
AlAluminium
Al SpinelMgAl2O4
SiSilicon
Si ClinoenstatiteMgSiO3
Si EnstatiteMg2Si2O6
Si ForsteriteMg2SiO4
PPhosphorus
P ApatiteCa5(PO4)3(Cl/F/OH)
P Schreibersite(Fe,Ni)3P
SSulfur
S TroiliteFeS
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
CaCalcium
Ca ApatiteCa5(PO4)3(Cl/F/OH)
FeIron
Fe Limonite(Fe,O,OH,H2O)
Fe Iron (var: Kamacite)(Fe,Ni)
Fe Schreibersite(Fe,Ni)3P
Fe Taenite(Fe,Ni)
Fe TroiliteFeS
Fe IronFe
NiNickel
Ni Iron (var: Kamacite)(Fe,Ni)
Ni Schreibersite(Fe,Ni)3P
Ni Taenite(Fe,Ni)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Score, R. & Lindstrom, M. [eds.] (1992) Petrologic Descriptions: Antarctic Meteorite Newsletter 14 (2): page 24. (Sept 1992).
Weisberg, M. K. & 5 others (1993) Petrology and Stable Isotopes of LEW 87232, A New Kakangari-type Chondrite: Meteoritics 28(3): 458-459. (July 1993).
Weisberg, M. K. & 7 others. (1996) The K (Kakangari) chondrite grouplet. Geochimica et Cosmochimica Acta, 60 (21): 4253-4263. (Nov 1996).
Brearley, A. J. & Jones, R. H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
Grady, M. M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
Hutchison, R. (2004) Meteorites: A Petrologic, Chemical and Isotopic Synthesis. Cambridge University Press: Cambridge, New York, Melbourne, Madrid, Cape Town, Singapore, São Paulo. 506 Pages.
Grady, M. M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

External Links


Other Regions, Features and Areas containing this locality

Antarctic MeteoritesGroup of Meteorite Fall Locations
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