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Holbrook meteorite, Aztec, Holbrook, Navajo Co., Arizona, USA

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Latitude & Longitude (WGS84): 34° 53' 60'' North , 110° 10' 60'' West
Latitude & Longitude (decimal): 34.90000,-110.18333
GeoHash:G#: 9w1ws9qgn
Locality type:Meteorite Fall Location
Meteorite Class:L/LL6 chondrite meteorite
Meteoritical Society Class:L/LL6
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:BSk : Cold semi-arid (steppe) climate

Ordinary Chondrite (L/LL6; S2; W0)
Fall, 19 July 1912;~250 kg, ~14,000 recovered stones

In the very late afternoon a spectacular meteorite shower was seen over several states before thousands of fragments fell near Holbrook. The largest was 6.6 kg (14.5 pounds) with others as small as a few mg. A number of them had well developed fusion crusts. Chondrules (0.5-1.5 mm in diameter) consist mainly of granular olivine and finely prismatic low-Ca orthopyroxene. They are intergrown within a recrystallized matrix which is also rich in olivine and pyroxene (much finer-grained) and is accompanied by Fe-Ni metal and troilite aggregates. The aggregates are scattered through the matrix and occasionally rim chondrule edges. Minor albitic plagioclase (An15), clinopyroxene, and chromite are in evidence as well as several other very minor accessory phases.

Holbrook is a member of the relatively sparse L/LL ordinary chondrite geochemical group which have total iron abundances intermediate to those of the L and LL chondrites (relatively low and very low iron, respectively). Only 11 witnessed L/LL falls are known to have been recovered (Meteoritical Database, January 2016). More specifically, Holbrook is one of only four witnessed falls listed exactly as L/LL6 ordinary chondrites at the Meteoritical Bulletin Database. The others are Cabezo de Mayo, Trysil, and Sultanpur.

Several additional Holbrook specimens have been recovered in the decades since the original fall of the meteorite shower. While badly weathered, these specimens have allowed for some intriguing studies of the rate of terrestrial weathering. [Estimates of the total mass listed at the Meteorite Bulletin Database and elsewhere are sometimes based only on the initial recovered mass.]

Mineral List

11 valid minerals.

Meteorite/Rock Types Recorded

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

0 - 0.0117 Ma

ID: 2717646
Holocene surficial deposits

Age: Anthropocene (0 - 0.0117 Ma)

Description: Unconsolidated deposits associated with modern fluvial systems. This unit consists primarily of fine-grained, well-sorted sediment on alluvial plains, but also includes gravelly channel, terrace, and alluvial fan deposits on middle and upper piedmonts. (0-10 ka)

Comments: Associated with modern fluvial systems

Lithology: Major:{silt,clay}, Minor:{gravel,sand}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Early Jurassic - Late Triassic
174.1 - 237 Ma

ID: 3185972
Mesozoic sedimentary rocks

Age: Mesozoic (174.1 - 237 Ma)

Lithology: Sandstone-conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Merrill, G.P. (1916) Handbook and descriptive catalogue of the meteorite collections of the United States National Museum. Smithsonian Institute Bulletin 94. Washington, DC.
Galbraith, F.W. (1947), Minerals of AZ, AZ Bur. Mines Bull. 153: 11, 20.
Mason, B. & Wiik, H. B. (1960) The Holbrook, Arizona, chondrite. Geochimica et Cosmochimica Acta 21(3-4): 276-283. (Jan 1961).
Mason, B. (1962) Classification of Chondritic Meteorites: American Museum Novitates, #2069. 20 pages. (May 1962).
Fuchs, L.H. (1969) The Phosphate Mineralogy of Meteorites: IN: Meteoritic Research: Millman, P.M.-Ed.: pp. 683-695.D. Reidel Publishing Company: Dordrecht-Holland.
Gibson, E. K., Jr. (1970) Discovery of Another Meteorite Specimen from the 1912 Holbrook, Arizona Fall Site. Meteoritics 5(1): 57-60.
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Socki, R. A., Gibson, E. K., Jull, A. J. T., & Karlsson, H. R. (1991) Carbon and oxygen isotope composition of carbonates from an L6 chondrite: Evidence for terrestrial weathering from the Holbrook meteorite: Meteoritics 26(4): p.396. (Dec 1991).
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 345
Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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