Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Allan Hills A77257 meteorite (ALHA77257), Allan Hills, Victoria Land, Eastern Antarctica, Antarctica

This page is currently not sponsored. Click here to sponsor this page.
 
Latitude & Longitude (WGS84): 76° 43' South , 159° 40' East
Latitude & Longitude (decimal): -76.71667,159.66667
Other regions containing this locality:Antarctic Meteorites
Non-native locality type:Meteorite
Meteorite Class:Ureilite meteorite
Meteoritical Society Class: Ureilite
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:EF : Ice cap climate


Ureilite
Find 1997; 1996 g

The Ureilites are ultramafic achondrites that contain interstitial carbon as graphite or diamond. The ALHA77257 Ureilite contains small amounts of both graphite and diamond as well as several other interesting interstitial phases. ALHA77257's dominant lithology, however, is that of a fairly coarse-grained stone compositionally dominated by olivine (~80%) and accompanying pyroxene (~15%) grains. Undulose extinction in olivine, polysynthetic twinning in pyroxene, and microtextures in metal all provide clues for deciphering the impact history of this and other ureilites. Perhaps most significant is evidence from distorted graphite grains that the diamonds in this and other ureilites have indeed been produced primarily by shock impact.

Significant amounts of terrestrial weathering products (limonite, hydromagnesite, …) — usually concentrated in the interstitial phases — are noted by several observers.

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


This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Score, R., Schwarz, C. M., King, T. V. V., Mason, H., Bogard, D. D. & Gabel, E. M. (1981) Antarctic Meteorite Descriptions: 1976-1977-1978-1979. Antarctic Meteorite Newsletter 4 (1), JSC, Houston. (Feb 1981)

Marvin, U. B. & Motylewski, K. (1980) Mg-Carbonates and Sulfates on Antarctic Meteorites (abstract). Lunar and Planetary Science XI: 669-670. (March 1980)

Mori, H. & Takeda, H. (1983) Deformation of Olivine in the Antarctic Ureilites, Allan Hills 77257 and 78262 (abstract): Lunar and Planetary Science XIV, 519-520. (March 1983)

Berkley, J. L. & Goodrich, C. A. (1985) Cohenite-Bearing Metallic Spherules in Ureilites: Petrology and Implications (Abstract). Lunar and Planetary Science XVI, 49-50. (March 1985)

Nakamuta, Y. & Aoki, Y. (2000). Mineralogical evidence for the origin of diamond in ureilites. Meteoritics & Planetary Science 35 (13): 487-493. (May 2000)

External Links


Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: January 21, 2019 14:40:23 Page generated: November 12, 2017 09:38:54
Go to top of page