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Basic information Name: Kolang
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes
Year fell: 2020
Country: Indonesia
Mass:help 2.55 kg
Recommended:  CM1/2    [explanation]

This is 1 of 26 approved meteorites classified as CM1/2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 1), CM chondrites, and CM-CO clan chondrites
Comments: Approved 28 Sep 2020
Writeup from MB 109:

Kolang        1°53’18.8"N, 98°39’39.6"E

Sumatera Utara, Indonesia

Fall: 1 Aug 2020

Classification: Carbonaceous chondrite (CM1/2)

History: (M. Farmer, Arizona) Around 4 pm local time (9 am UTC) on 1 August 2020, residents in northwest Sumatra (Central Tapanuli Regency) heard loud booming sounds that shook their houses. A single stone weighing ~2100 g went through the roof of a house in Kolang at 1°53’18.8"N 98°39’39.6"E (Satahi Nauli, Kolang, Central Tapanuli Regency, North Sumatra, Indonesia) and embedded itself into the soil beside the house. Another stone impacted in a rice paddy about 2.2 km south of the main mass. Two more stones were found ~7.8 km to the SE (around 1°49’50.22"N 98°41’51.22"E). Michael Farmer initially acquired 266 g, which includes fragments from the main mass and the rice paddy stone. This material was used for the classification.

Physical characteristics: To date, four stones have been recovered 2100 g (main mass), ~250 g (rice paddy), ~100 g (in two pieces), and ~100 g (complete stone). The masses of the two 100 g stones were estimated from their photographs. The main mass is blocky with a flat face and well-developed regmaglypts. About 250 g was broken off the main mass revealing a highly brecciated interior. Fragments crushed with water emit a delicate, earthy smell, though not as persistent or complex as that from Aguas Zarcas or Murchison.

Petrography: (L. Garvie, ASU) The interior of the stones are dark gray to black and sparsely decorated with light-colored speckles, and host common breccia fragments that protrude from the fracture surfaces. One fragment shows a large (3 mm) CAI with a pinkish hue. Three breccia types are visible: hard with conchoidal fracture and lacking or poor in chondrules; chondrule rich; and, greenish gray. Powder XRD shows considerable mineralogical diversity between different areas of matrix and clasts. Representative pieces from the bulk matrix are dominated by serpentine, with medium- to low-intensity reflections for regularly interstratified tochilinite/cronstedtite, tochilinite, calcite, pyrrhotite, and pentlandite. Some areas contain two distinct serpentines with basal spacings of 7.297 and 7.213 Å. BSE images from an ~1.5 × 2 cm fragment from the visually average lithology shows intense brecciation at all magnification scales, but is best described by two end-member petrographies. A) Intensely comminuted consisting of breccia fragments, sparse silicate fragments, and rare recognizable chondrules in a fine-grained matrix that is locally PCP rich. The chondrules and silicate fragments show a range of alteration to hydrous phases and many lack anhydrous silicates. B) Chondrule-rich breccia clast with a matrix dominated by PCP-rich objects. Chondrule mean diameter=125 μm (n=41, range 34 to 291 μm), not including a large 1.5 × 1 mm BO chondrule. Particularly noticeable in hand specimen are sparsely distributed greenish-gray breccia clasts (to 2 cm). Powder XRD shows the clast to be dominated by two serpentines, pyrrhotite, pentlandite, and calcite, and a medium-intensity basal reflection from well-crystallized smectite. Polished mount of this clast shows abundant chondrule pseudomorphs and coarse-grained sulfides.

Geochemistry: Oxygen isotopes (K. Ziegler, UNM) (linearized, all per mil, TFL slope=0.528): Eight fragments were analyzed by laser fluorination of which seven lie within the CM field. Two pieces were run from each fragment. Sample weights for each measurement were between 2.0 and 5.6 mg. All data in ‰. These include: Average lithology fragment 1 (δ18O 7.669, δ17O 1.332, Δ17O -2.717 and δ18O 8.591, δ17O 1.493, D18O -3.043); Average lithology fragment 2 (δ18O 9.141, δ17O 2.171, Δ17O -2.656 and δ18O 8.477, δ17O 1.992, Δ17O -2.484); Chondrule-rich lithology (δ18O 7.310, δ17O 1.480, Δ17O -2.380 and δ18O 9.245, δ17O 2.224, Δ17O -2.658); Chondrule-poor clast 1 (δ18O 11.378, δ17O 2.708, Δ17O -3.299 and δ18O 11.137, δ17O 2.580, Δ17O -3.301); Chondrule-poor clast 2 (δ18O 8.774, δ17O 2.116, Δ17O -2.517 and δ18O 9.765, δ17O 2.414, Δ17O -2.742), Chondrule-poor clast 3 (δ18O 13.133, δ17O 3.984, Δ17O -2.950 and δ18O 12.346, δ17O 3.310, Δ17O -3.209). Greenish-grey breccia clast (δ18O 6.377, δ17O 0.642, Δ17O -2.725 and δ18O 6.790, δ17O 0.848, Δ17O -2.737). The data for the metal-rich and chondrule-rich clast falls outside the CM field (δ18O -0.161, δ17O -6.189, Δ17O -6.104 and δ18O 1.595, δ17O -4.374, Δ17O -5.216). Microprobe (L. Garvie, ASU): Olivine shows a wide compositional range from Fa0.5 to Fa41.5 (n=13), with CaO up to 0.5 wt%, Cr2O3 up to 0.6 wt%, NiO up to 0.1 wt%, and Al2O3 up to 0.5 wt%.

Classification: CM1/2. All the oxygen isotopes, except the metal- and chondrule-rich clast, fall within the CM field. The dominant lithology contains areas with chondrules completely replaced by hydrous silicates and intimately associated and mixed with chondrules and olivine fragments partially replaced by hydrous phases (CM1/2), to areas more typical of CM2 meteorites. The bulk mineralogy is largely consistent with CM1 to 2 meteorites.

Specimens: Total known weight of approximately 2550 g. The distribution of the masses are as follows Michael Farmer (296 g); ASU 28.7 g off the main mass; remaining main mass of 1843 g was purchased by Robert Wesel, Mark Lyon and Jared Collins and now owned by Jay Piatek. The whereabouts of the two smaller stones is unknown.

Data from:
  Table 0
  Line 0:
State/Prov/County:Sumatera Utara
Date:1 Aug 2020
Mass (g):2550
Fayalite (mol%):0.5-41.5 (n=13)
Classifier:L. Garvie, ASU, and K. Ziegler, UNM
Type spec mass (g):28.7
Type spec location:ASU
Main mass:Jay Piatek
Comments:see karmaka.de for photographs of the fall site etc.; submitted by L. Garvie
Plots: O isotopes:  
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Roberto Vargas   

     Recommended::   (1° 53' 19"N, 98° 39' 40"E)

     This is the only approved meteorite from Sumatera Utara, Indonesia
     This is 1 of 19 approved meteorites from Indonesia (plus 2 unapproved names)
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