Star-Stones
& OuterSpacer Meteorites
Sourcing and supplying minerals & gemstones since 1991
We proudly supply clients all over the world from our showroom in
beautiful Andalucía, Spain.
KOLANG (Hammer
Stone)
CM1/2 Carbonaceous Chondrite
This incredibly rare carbonaceous chondrite was part of the well-known and documented piece
that smashed through the roof of a house in Sumatra, Indonesia on 1st
August 2020 (see photos).
SpecimenType
Hammer Stone Fragment
Item Specifications
There is 1pc in
this lot. The weight of this piece is <0.01 g
See the 1cm
(10mm) scale cube to get an accurate idea of this item's size.
Please note:
The scale cube is not included with this item.
Item
Information
Observed
Meteorite Fall; Yes
Date of Fall; 4pm on August 1st
2020
Location of Find; Northwest Sumatra, Indonesia
Total Known
Weight (TKW); 2.55 kg
Meteoritical Bulletin (MB109) Entry…
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.
Meteoritical Bulletin entry containing further information;
https://www.lpi.usra.edu/meteor/metbull.php?code=72607
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This item
comes with a label in a foam-lined plastic display box, measuring approximately
57x37mm
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About Us
Star-Stones is
owned and operated by husband & wife team, Sean & Wendy Mahoney, who
have been traveling the world, sourcing, and supplying gemstones and minerals
since 1991. Following the sale of their crystal & mineral warehouse and
wholesale business in Byron Bay , Australia in 2016, they moved with their
children to Andalusia in Spain. There, they established Star-Stones as a
means of continuing their life's work of bringing some of the best crystals and
minerals that nature has to offer, to the rest of the world. Their
businesses are registered in Estonia and operate from their showroom in
Spain.
OuterSpacer
Meteorites is owned and operated by Sean Mahoney. He is a 30-year veteran
of the gemstone and mineral industry, and has attended the Tucson Gem & Mineral
Show since 1999 as well as many other trade shows worldwide. His
OuterSpacer Meteorites booth in Tucson is in the main pavilion at the Mineral
& Fossil Marketplace.
Sean hunts for
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Business member number G0010 and Board Director for 2021-2022
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