[meteorite-list] New Mazichuan China Diogenite fall approved (September 16, 2016)

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Sun, 1 Apr 2018 22:36:04 -0400
Message-ID: <CAKBPJW--Fqzk5BpMUmDUmFUXWJuGjn_M-FtubhooZ12k55CORw_at_mail.gmail.com>

The Mazichuan diogenite fall in China (09-16-16) has been approved in
the Meteoritical Bulletin database.

Link - https://www.lpi.usra.edu/meteor/metbull.php?code=66831

All 21st century meteorite falls - http://galactic-stone.com/pages/falls

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Mazichuan
36.693?N, 108.30?E
Shaanxi, China
Confirmed fall: 2016 Sept 16

Classification: HED achondrite (Diogenite)

History: On 16 September 2016, at about 15:00 local time, many
residents from several villages heard an airplane-like noise followed
by three loud sonic booms. A woman in Mazichuan witnessed dusty smoke
rising from a hillside 100 m away from her home. She went to the
hillside and picked up a black stone in a hole. She then knocked off a
corner of the stone and found greenish crystals inside. The stone was
abandoned outside her yard and later picked up by her neighbor. Photos
of the stone with black fusion crust and greenish crystals appeared on
an amateur meteorite website in November 2016. A Chinese meteorite
collector (Wang Ziyao) contacted the holders. He went to the fall site
three times (April, June, and September 2017) and did a thorough
investigation. Mr. Wang confirmed the fall account. A total of three
stones (1302, 1100, and 880 g) were recovered by residents. The
largest was bought from a local villager by a meteorite hobbyist (Liu
Yukun) on December 1, 2017.

Physical characteristics: The hand specimen is covered with a fresh
black fusion crust. Numerous mm-sized greenish crystals can be seen on
the exposed section.

Petrography: A monomict breccia mainly consisting of coarse-grained
orthopyroxene (a few mm) set in a fine-grained matrix of
orthopyroxene. Accessory minerals are chromite, sulfide, FeNi metal
and silica. Anorthite was not found.

Geochemistry: Orthopyroxene grains have very homogeneous compositions
regardless their grain size. Orthopyroxene (Fs20.9-22.5Wo1.3-2.2),
Fe/Mn (cation ratio) range from 25.2 to 33.6 with an average of
29.8?2.1 (n=32).

Specimens: 36 g at PMO, a 1.3 kg mass with Mr. Liu Yukun, and two
other masses are in the possession of local finders.

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Received on Sun 01 Apr 2018 10:36:04 PM PDT