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Diogenites

Bilanga

Name

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Structure Class

HED achondrites

Chemical Class

Diogenite

Country

Year found

1999

Mass

25 kg

[Museum Collection]

(1) 48g   (2) 41g

This is 1 of 514 approved meteorites classified as Diogenite. Search for specimens in the Smithsonian Institution collection (U.S.): Search for this meteorite in the Natural History Museum collection (U.K.): Published in Meteoritical Bulletin, no. 84, MAPS 35, A199-A225 (2000)

Dhofar 700

Name

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Structure Class

HED achondrites

Chemical Class

Diogenite

Country

Year found

2002

Mass

2.77 kg

[Museum Collection]

(1) 2.54g

This is 1 of 514 approved meteorites classified as Diogenite. Published in Meteoritical Bulletin, no. 87, MAPS 38, A189-A248 (2003)

Tatahouine

Name

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Structure Class

HED achondrites

Chemical Class

Diogenite

Country

Year found

1931

Mass

12 kg

[Museum Collection]

(1) 7.75g

This is 1 of 514 approved meteorites classified as Diogenite. Search for specimens in the Smithsonian Institution collection (U.S.): Search for this meteorite in the Natural History Museum collection (U.K.): Search for this meteorite in the Museo Nazionale dell'Antartide database (Siena, Italy): Never published in the Meteoritical Bulletin

NWA4965

Name

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Structure Class

HED achondrites

Chemical Class

Diogenite

Country

Year found

2007

Mass

1023 g

[Museum Collection]

(1) 10.66g

This is 1 of 514 approved meteorites classified as Diogenite. Published in Meteoritical Bulletin, no. 97, MAPS 45, 449-493 (2010)

NWA5480

Name

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Structure Class

HED achondrites

Chemical Class

Diogenite

Country

Year found

2008

Mass

4.91 kg

[Museum Collection]

(1) 51g

This is 1 of 514 approved meteorites classified as Diogenite. Published in Meteoritical Bulletin, no. 95, MAPS 44, 429-462 (2009)

NWA6232

Name

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Structure Class

HED achondrites

Chemical Class

Diogenite-olivine

Country

Year found

2010

Mass

800 g

[Museum Collection]

(1) 12.26g

This is 1 of 19 approved meteorites classified as Diogenite-olivine. Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]

NWA7183

Name

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Structure Class

HED achondrites

Chemical Class

Diogenite-pm

Country

Year found

2007

Mass

175 g

[Museum Collection]

(1) 18.7g   (2) 13.7g   (3) 11.3g   (4) 2.7g

(5) 2.62g

History: Purchased by Twelker in 2007 September from a Moroccan dealer at the Denver Mineral Show. Petrography: (A. Irving and S. Kuehner, UWS) Very fresh fragmental breccia consisting predominantly of angular diogenitic orthopyroxene grains (up to 2 mm across) plus

NWA11375

Name

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Structure Class

HED achondrites

Chemical Class

Diogenite-pm

Country

Year found

2017

Mass

784 g

[Museum Collection]

(1) 28.0g   (2) 4.5g   (3) 4.4g   (4) 3.9g

History: Purchased by Eric Twelker in May 2017 from a Moroccan dealer. Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of angular mineral grains and rare pyroxene-chromite symplectite clasts in a sparse matrix. The predominant mineral is low-Ca pyroxene (exhibiting undulose extinction) with subordinate olivine (of several different compositions), chromite, metal, fayalite, and minor (

NWA14874

Name

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Structure Class

HED achondrites

Chemical Class

Diogenite

Country

Year found

2022

Mass

670 g

[Museum Collection]

(1) 5.50g

History: The meteorite was purchased from a meteorite dealer in Morocco. Physical characteristics: Light grayish rock without fusion crust. Petrography: The meteorite displays an unbrecciated grayish interior and is predominantly composed of up to 5 mm sized interlocking orthopyroxene (56 vol%) and calcic plagioclase (42 vol%) grains with minor Ti-bearing chromite and troilite. Few orthopyroxenes contain blebby augite exsolutions. Geochemistry: low-Ca pyroxene: Fs30.8±0.2Wo3.4±0.4 (Fs30.4-31.2Wo2.6-3.9, FeO/MnO=24-26, n=12); Ca-pyroxene: Fs15.9±0.4Wo39.7±0.4 (Fs15.5-16.6Wo39.1-40.1, FeO/MnO=19-20, n=6); calcic plagioclase: An96.1±0.3 (An96.0-96.5, n=11) Classification: Diogenite (noritic). Anomalous high plagioclase abundance (42 vol%).

Name

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Structure Class

HED achondrites

Chemical Class

Diogenite-an

Country

Year found

2024

Mass

2 kg

[Museum Collection]

(1) 29.666 g

History: The meteorite was purchased from a meteorite dealer in Libya. Physical characteristics: Light grayish to light greenish stone partly covered with patchy fusion crust. Petrography: Achondrite dominantly composed of a fine-grained lithology with interspersed coarse-grained enclaves. In the fine-grained part patchily zoned pyroxenes and calcic plagioclase are the most abundant mineral phases. Both are often lath-shaped and gradually coarsen radially towards the enclaves which are dominantly composed of blocky up to 4 mm sized low-Ca pyroxene crystals. Many of these large crystals show resorption textures with embayed outlines and are sometimes overgrown by more Ca-rich patchy pyroxene. Olivine is a minor constituent in the fine-grained regions but becomes more abundant and more ferroan towards the coarse-grained areas. In both lithologies olivine often contains trapped melt inclusions and myrmekitic intergrowths of low-Ca pyroxene and troilite. Vesicles are abundant in the fine-grained regions. Minor phases include silica, apatite, chromite, troilite, and FeNi metal. Geochemistry: fine-grained lithology: patchily zoned pyroxene: Fs35.0±14.0Wo10.2±7.9 (Fs20.1-66.0Wo1.0-25.0, FeO/MnO=24-36, n=20); olivine: Fa31.3±0.6 (Fa30.5-32.1, FeO/MnO=44±2, n=10); calcic plagioclase: An90.6±1.5Or0.5±0.2 (An87.3-91.7Or0.3-0.9, n=10); Cr# in chromite: 68.4±3.1, n=5; coarse-grained lithology: olivine: Fa45.1±6.9 (Fa33.9-53.1, FeO/MnO=43±3, n=10); large low Ca-pyroxenes: Fs25.6±0.9Wo2.4±0.5 (Fs24.2-27.1Wo1.4-3.3, FeO/MnO=24-29, n=12); exsolutions in large pyroxenes: Fs28.3±1.0Wo5.5±0.3 (Fs26.4-29.0Wo5.0-5.9, FeO/MnO=25-29, n=6) Classification: Diogenite (anomalous, olivine-bearing). Diogenite based on presence of large low-Ca pyroxene grains, FeO/MnO ratios of pyroxene and olivine, and An-content of plagioclase. Anomalous designation based on dominant fine-grained lithology with abundant patchily zoned pyroxenes.

NWA17016

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