.885 grams 15x11x2mm JEPARA fragment Meteorite Pallasite, PMG - with clear coat

Description

Jepara        6°36’S, 110°44’E
Java, Indonesia
Found: May 2008
Classification: Pallasite (Main group)
History: Anonymous finders recovered the meteorite specimen in 2008 during excavation activities in muddy ground.
Physical characteristics: The original mass of the meteorite boulder was 499.5 kg. It is spherically shaped with the shortest and longest diameter of 70 cm and 85 cm, respectively. The crust is weathered and rusty.
Petrography: The interior shows a homogeneous distribution of coarse-grained rounded olivine grains (6 to 12 mm). The groundmass is composed of secondary magnetite, nickel sulfide and sulfate (nickel hexahydrite), and primary schreibersite. Modal abundances are olivine (64 vol%), magnetite (23 vol%), nickel sulfide and sulfate (8 vol%), and schreibersite (5 vol%).
Geochemistry: Olivines are homogeneous in composition (Fa
12-13
). Sulfide is composed of NiS and may represent a replacement product of troilite, while magnetite (Fe
3
O
4
) is a weathering product of primary FeNi phases. Schreibersite has the composition (Fe
1.85
Ni
1.15
)P. Replicate analyses of oxygen isotopes were made on acid-washed samples by laser fluorination at
UGött
(A. Pack): δ
17
O (SMOW) 1.862, 1.367, 1.380; δ
18
O (SMOW) 3.820, 3.011, 3.160; and Δ
17
O -0.130 -0.200, -0.280 (all per mil).
Classification: Main group pallasite, extensively weathered, fresh olivine
T
otal weight:  499 kg
Meteorites are rarer than gold on the earth surface and only very few of them are Pallasites a unique structure of metal and gemstone. They come from the asteroid belt between Mars and Jupiter and the material is 4,60 billion years old and are the part of the transition zone between the mantle and the core of an asteroid. The first one was discovered in 1749 at Krasnojarsk/Russia and described by Peter Simon Pallas, a German scientist. Consequently, the meteorite group was named Pallasites in honor of him. Over the last centuries only 36 pieces of the Main Group have been found, half of them are less than 20 kg. With reference to his weight Jepara is the five largest Main Group Pallasite.
History:
The meteorite was discovered in May 2008 during excavation activities at  Jepara, Indonesia. A new hall for producing furniture had been under construction and Jepara has been dug out while building the foundation of this premises.
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