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Fleming meteorite, Logan Co., Colorado, USA

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Latitude & Longitude (WGS84): 40° 40' 59'' North , 102° 49' 0'' West
Latitude & Longitude (decimal): 40.68333,-102.81667
Non-native locality type:Meteorite
Meteorite Class:H3.7 chondrite meteorite
Meteoritical Society Class: H3.7
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:BSk : Cold semi-arid (steppe) climate

Ordinary chondrite, black (H3.7,br; S3; W4)
Found, 1940; 1.75 kg

The meteorite exhibits brecciated chondritic features with several types of mostly porphyritic olivine and/or pyroxene rich chondrules (esp., PO, POP). Distinct chondrules with diameters ranging from 100 µm to 1.2 mm are observed. Variable olivine (Fa5-25;av.16.5) and lesser amounts of low Ca-clinopyroxene are characteristic of the unequilibrated H-chondrite geochemical group. Shock-darkened ('black') regions and mosaicism in olivine are indicative of moderately strong pre-terrestrial shock (level S3). Weathering is quite apparent.

A very approximate cosmic ray exposure (CRE) age of 6.0 Ma may reflect a disruptive collision involving a number of other H chondrites as more than half the measured CRE ages of H chondrites are in the 6-10 Ma range.

The H (relatively high in total iron) chondrites are the second largest group of ordinary chondrites and represent ~40% of classified witnessed falls. However, the H3 petrologic type — normally characterized by variable, (unequilibrated) olivine and pyroxene — account for only 5% or so of the total group.

The largest mass (~400 g) is now at Arizona State University's Center for Meteorite Studies.

Mineral List

3 valid minerals.

Meteorite/Rock Types Recorded

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This page contains all mineral locality references listed on 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 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.


Mason, B. (1963) Olivine in ordinary chondrites. Geochimica et Cosmochimica Acta 27(9): 1011-1023. (Sept 1963).

Rubin, A. (1990) Olivine & Kamacite in Ordinary Chondrites: Intergroup and Intragroup relationships. Geochimica et Cosmochimica Acta 54: 1217-1230.

Graf, T. & Marti, K. (1995) Collisional History of H Chondrites: Journal of Geophysical Research 100 (E10): 247-263. (Oct 1995).

Grady, M.M (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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