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Status: Official

Basic information

Name: Gadamis 010 This is an OFFICIAL meteorite name.

Abbreviation: There is no official abbreviation for this meteorite.

Observed fall: No

Year found: 2025

Country: Libya

Mass: 662 g

Classification history:

Meteoritical Bulletin, MB 114 (2025): Angrite

Recommended: Angrite

This is 1 of 66 approved meteorites classified as Angrite. [show all]

Search for other: Achondrites, Angrites

Comments:

Approved 6 Dec 2025

Writeup from MB 114:

Gadamis 010 30°04.767'N, 09°25.963' E

Ghadamis, Libya

Find: 2025

Classification: Angrite

History: Twenty stones were found in 2025 in the Libyan desert near the Algerian border, ~8 km SW of Gadamis. This material was then purchased online in October 2025 by Matthew Stream.

Physical characteristics: Multiple stones with variably weathered fusion crust on the outside. A slice from the interior reveals an porphyritic texture with large green olivine crystals visible.

Petrography: (D. Sheikh, Cascadia) Specimen is vesicular and exhibits a porphyritic texture comprised of sub-rounded magnesian olivine megacrysts (generally mm-sized, maximum lengths up to ~1 cm; displaying corona texture with rims of ferroan olivine) set within a largely medium-grained (Av. grain size ~0.8±0.2 mm) groundmass composed primarily of twinned anorthite laths, compositionally zoned Al-Ti-rich augite (mix of equant and elongate grains), compositionally zoned Ca-rich ferroan olivine (occurring as: 1) subhedral to euhedral, equant phenocrysts, and 2) anhedral grains interstitial to anorthite, Al-Ti-rich augite, and phenocryst olivine), and interstitial glass. Accessory phases identified includes pleonaste spinel, Al-bearing titanomagnetite, subcalcic kirschsteinite (rimming several phenocryst and groundmass olivine grains), troilite, and Ca-phosphates.

Geochemistry: Magnesian Olivine Megacrysts (Fa15.6±2.6Ln0.6±0.1, range Fa12.3-18.3Ln0.4-0.7, Cr2O3 (wt. %) = 0.15±0.04, Fe/Mn = 89±8, n=11), Ferroan Phenocryst/Groundmass Olivine (Fa60.1±17.1Ln6.4±5.3, range Fa34.4-85.2Ln1.2-20.2, Fe/Mn = 79±10, n=39), Subcalcic Kirschsteinite (Fa70.7Ln25.0, Fe/Mn = 61, n=1), Al-Ti-rich Augite (Fs34.4±10.5Wo51.3±0.5, range Fs22.1-49.3Wo50.1-52.4, Al2O3 (wt. %) = 6.5±0.8, TiO2 (wt. %) = 2.3±1.0, Fe/Mn = 103±22, n=26), Anorthite (An99.7±0.2, range An99.3-99.9, n=23), Pleonaste Spinel (Mg# = 46.6, Cr# = 8.8, n=1).

Classification: Angrite. Ferroan olivine and Al-Ti-rich Augite chemical trends overlap with those of angrites (Jambon et al., 2005; Keil, 2012); large magnesian olivine megacrysts chemically overlap with xenoliths/"olivinites" observed in angrites (Keil, 2012; Varela et al., 2017).

Specimens: 20.1 g type specimen at Cascadia, 520 g with Matthew Stream and Sidialal Adawadi, 120 g with Preston Allen.

Bibliography:

Jambon A., Barrat J. A., Boudouma O., Fonteilles M., Badia D., Göpel C. and Bohn M. (2005) Mineralogy and petrology of the angrite Northwest Africa 1296. Meteoritics & Planetary Science 40, 361–375. (link)

Keil K. (2012) Angrites, a small but diverse suite of ancient, silica-undersaturated volcanic-plutonic mafic meteorites, and the history of their parent asteroid. Geochemistry 72, 191–218. (link)

Varela M. E., Hwang S.-L., Shen P., Chu H.-T., Yui T.-F., Iizuka Y., Brandstätter F. and Abdu Y. A. (2017) Olivinites in the angrite D’Orbigny: Vestiges of pristine reducing conditions during angrite formation. Geochimica et Cosmochimica Acta 217, 349–364. (link)

Data from: MB114

Table 0 Line 0:

State/Prov/County: Ghadamis

Origin or pseudonym: Desert

Place of purchase: Online

Date: 2025

Latitude: 30°04.767'N

Longitude: 09°25.963' E

Mass (g): 662

Pieces: 20

Class: Angrite

Shock stage: low

Weathering grade: moderate

Fayalite (mol%): 15.6±2.6, 60.1±17.1

Ferrosilite (mol%): 34.4±10.5

Wollastonite (mol%): 51.3±0.5

Classifier: D. Sheikh, Cascadia

Type spec mass (g): 20.1

Type spec location: Cascadia

Main mass: Matthew Stream

Comments: CML 2040; submitted by Daniel Sheikh