Timimoun 003 ( 3,619 g )

Timimoun 003        29°22.93' N, 1°11.73' E
Adrar, Algeria
Purchased: 2025 Apr
Classification: Enstatite achondrite (Aubrite)
Physical characteristics: The surface of the stone exhibits a brownish-yellow to whitish coating, which represent a weathered surface. The interior reveals whitish enstatite crystals interspersed with brownish tarnished spots. Rare, tiny grains of fresh metal are also visible.
Petrography: The analyzed sample exhibits a coarse-grained texture, dominated by an aggregate of enstatite grains with grain size to several mm, with accessory phases including Ti-bearing troilite, daubréelite, Si-bearing kamacite, diopside, and albite. Olivine was not observed in the examined section. Sulfide grains are usually altered and replaced by secondary terrestrial mineralization such as iron-oxide, Mn-Fe oxide, or complex mixture of silicate and oxides. Ca-carbonate thin veins are also found.
Geochemistry: Enstatite Fs0.2±0.1Wo0.8±0.3 , n=17; diopside Fs0.1±0.2Wo46.6±0.7, n=3; plagioclase An3.0-3.6Ab93.4-95.1, n=3; troilite contains Ti=1.0-1.4 wt.%, n=5; kamacite contains Ni=0.4-0.5 wt.% and Si=0.5-1.2 wt.%, n=5.
Classification: Aubrite.
Specimens: Mark Lyon holds the main mass. One end-cut sample (20.5 g) at MSN-FI, University of Firenze, Italy.
 
State/Prov/County:
Adrar
Date:
P 2025 Apr
Latitude:
29°22.93' N
Longitude:
1°11.73' E
Mass (g):
26000
Pieces:
many
Class:
Aubrite
Shock stage:
low
Weathering grade:
moderate
Ferrosilite (mol%):
0.2±0.1 (n=9)
Wollastonite (mol%):
0.8±0.3 (n=9)
Classifier:
G. Pratesi, T. Cuppone, X. Shehaj Dipartimento di Scienze della Terra, Università di Firenze, Italia
Type spec mass (g):
20.5
Type spec location:
MSN-FI
Main mass:
Mark Lyon
Comments:
Work name ML001. Submitted by G. Pratesi; submitted by G. Pratesi