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Basic information Name: Jepara
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2008
Country: Indonesia
Mass:help 499.5 kg
Meteoritical Bulletin:  MB 100  (2012)  Pallasite, PMG 
Recommended:  Pallasite, PMG    [explanation]

This is 1 of 57 approved meteorites (plus 1 unapproved name) classified as Pallasite, PMG.   [show all]
Search for other: Main group pallasites, Metal-rich meteorites, and Pallasites
Comments: Approved 19 Jul 2011
Writeup from MB 100:

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 (Fa12-13). Sulfide is composed of NiS and may represent a replacement product of troilite, while magnetite (Fe3O4) is a weathering product of primary FeNi phases. Schreibersite has the composition (Fe1.85Ni1.15)P. Replicate analyses of oxygen isotopes were made on acid-washed samples by laser fluorination at UGött (A. Pack): δ17O (SMOW) 1.862, 1.367, 1.380; δ18O (SMOW) 3.820, 3.011, 3.160; and Δ17O -0.130 -0.200, -0.280 (all per mil).

Classification: Main group pallasite, extensively weathered, fresh olivine

Specimens: Type specimens of 230 g and 20 g with surface areas of 190 cm2 and 20 cm2, respectively, and one thin section are on deposit at UJena. An anonymous owner holds the main mass.

Data from:
  Table 1
  Line 514:
Date:May 2008
Mass (g):499500
Class:Pallasite, PMG
Weathering grade:W4
Fayalite (mol%):12-13
Classifier:Falko Langenhorst, UBayr
Type spec mass (g):250
Type spec location:UJena
Main mass:anonymous
Comments:Submitted by Falko Langenhorst
Plots: O isotopes:  
   and collections
UJena: Analytische Mineralogie der Mikro- und Nanostrukturen Institut für Geowissenschaften Friedrich-Schiller-Universität Jena Carl-Zeiss-Promenade 10 07745 Jena Germany, Germany (institutional address; updated 7 Aug 2021)
UBayr: Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany (institutional address; updated 5 Feb 2020)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     Recommended::   (6° 36'S, 110° 44'E)

     This is 1 of 4 approved meteorites from Jawa Tengah, Indonesia (plus 1 unapproved name)
     This is 1 of 21 approved meteorites from Indonesia (plus 2 unapproved names)
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