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Halloran Spring
Basic information Name: Halloran Spring
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2019
Country: United States
Mass:help 18.15 kg
Classification
  history:
Recommended:  Iron, IIIAB    [explanation]

This is 1 of 319 approved meteorites classified as Iron, IIIAB.   [show all]
Search for other: IIIAB irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 18 Apr 2020
Writeuphelp
Writeup from MB 109:

Halloran Spring        35°25.63’N, 115°55.62’W

California, United States

Find: March 2019

Classification: Iron meteorite (IIIAB)

History: Found by the owner on their property near Halloran Spring, California, while he was prospecting with a metal detector in March 2019.

Physical characteristics: The meteorite measures approximately 33 × 30 × 15 cm, is irregularly shaped and has an orange-red exterior surface. Mass was readily broken after discovery into numerous silvery-black, ~kg-sized fragments with red-brown exteriors.

Petrography: (C. Herd, UAb) Optical investigation of several specimens including a ~3 × 5 cm polished surface reveals a highly weathered iron meteorite, with veins following and cross-cutting kamacite lamellae boundaries. In some specimens, metal has been completely replaced by magnetite. Measurement of kamacite lamellae, while difficult due to the alteration, suggests a medium to course octahedrite (BW 1.5±0.2 mm; n=9). Several mm-scale lath-shaped inclusions (replaced by oxide) with swathing kamacite are present.

Geochemistry: ICP-MS data, using sample of North Chile (Filomena) as standard (C. Herd and G. Chen, UAb): Ni = 5.6, Co = 0.3 (both wt%); Ir = 1.4, Ga = 72, , Ge = 94, As = 11, W = 0.8, Re = 0.15, Pt = 4.8, Cu = 125, Au = 1.1 (all µ/g).

Classification: (C. Herd, UAb): The highly altered nature of the meteorite is a challenge for classification. Ni, Co, Ga, Ge, and possibly As values have likely been modified by alteration. Other values are consistent with trends observed in IIIAB meteorites. If the meteorite is a IIIAB, then known Au-Ni relationships in IIIAB meteorites indicates that the original Ni content was ~8.5 wt%.

Specimens: Type specimen consisting of 468 g and 249 g representative masses, and 288 g of numerous small fragments, at UAb. Main mass with Peter Goldy.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:California
Date:March 2019
Latitude:35°25.63'N
Longitude:115°55.62'W
Mass (g):18150
Pieces:1
Class:Iron, IIIAB
Shock stage:low
Weathering grade:high
Classifier:C. Herd, UAb
Type spec mass (g):1004
Type spec location:UAb
Main mass:Peter Goldy
Comments:Submitted by C. Herd
Institutions
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos:
CreditPhotos
Public domain photographs:
Chris Herd   
Geography:

United States
Coordinates:
     Recommended::   (35° 25' 38"N, 115° 55' 37"W)

Statistics:
     This is 1 of 262 approved meteorites from California, United States (plus 24 unapproved names)
     This is 1 of 1861 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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