Hello up for sale is very rare "Rafsa 004" classified as a "NEW" Very Rare Plutonic Angrite!! Plutonic angrites are chemically equilibrated through slow cooling, and the assumption is that plutonic igneous rocks are from a deeper origin in the parent body, whereas volcanic angrites show chemical zonation in the olivines and pyroxenes and are assumed to have cooled quickly in a surface or near surface environment. This gorgeous part-slice weighs 5.206 grams, it has a perfect mirror polish to one side with hue colors of ruby red and purple. Microprobe examination and reflected light microscopy of a polished mount shows a protogranular texture of calcium-bearing olivine, titanoan aluminian augite, anorthite, and spinel. Approximately half of the kamacite in this meteorite has been altered to iron-oxide. Many fine veinlets of iron-oxide crosscut the primary minerals. This meteorite comes with Streaming Meteorites COA card and display case. Thanks for your interest and take care!

• Angrites are olivine-bearing, basaltic meteorites that originate from a volatile-depleted planetesimal. Previous work on angrites suggests that their parent body accreted within the first 0.5 to 1 Myr of solar system evolution and differentiated via extensive melting and crystallization of igneous rocks within ~2 Myr after the first solids formed (~4.57 billion years ago). Petrologic studies indicate that angrites experienced little physical or chemical alteration after crystallizing. Consequently, angrites are the oldest known igneous rocks, preserving records of early solar system chronology and planetary formation, melting, and differentiation.

• Rafsa 004

• Plutonic Angrite

• Date: 2023

• Mass (g): 299.3 g

• Pieces: 2

• Class: Angrite

• Shock stage: low

• Weathering grade: moderate

• Fayalite (mol%): 40.6±0.2

• Ferrosilite (mol%): 10.9±0.4

• Wollastonite (mol%): 52.8±0.7

• Classifier: C. Agee, UNM

• Type spec mass (g): 20

• Type spec location: UNM

• Main mass: Matthew Stream

• History: Purchased by Matthew Stream from a meteorite dealer in Northwest Africa.

• Physical characteristics: Two stones that fit together; 218 g and 81.4 g. Irregular shaped exterior, dark brown, lacking fusion crust.

• Petrography: (C. Agee, UNM) Microprobe examination and reflected light microscopy of a polished mount shows a protogranular texture of calcium-bearing olivine, titanoan aluminian augite, anorthite, and spinel. Approximately half of the kamacite in this meteorite has been altered to iron-oxide. Many fine veinlets of iron-oxide crosscut the primary minerals.

• Geochemistry: (C. Agee, UNM) Olivine Fa40.6±0.2, CaO=1.3±0.1 (wt%), Fe/Mn=87±6, n=6; titanoan aluminian augite Fs10.9±0.4Wo52.8±0.7, Al2O3=7.4±1.0, TiO2=1.5±0.2 (both wt%). Fe/Mn=93±32 n=5; anorthite An99.1±0.3, n=4.

• Classification: Plutonic angrite with compositionally equilibrated silicates, likely paired with NWA 2999, NWA 3164, and NWA 12822.

• Specimens: 20 g on deposit at UNM, Matthew Stream and Preston Allen hold the main mass.