NWA 15915, Rare Meteorite – Boxed, 0.4 g

This rare meteorite, a 0.4 g fragment of the ungrouped achondrite NWA 15915, was recovered near Aougrout in Algeria. The specimen represents a very unusual Mg-rich achondrite dominated by clinopyroxene, a mineral composition that is extremely uncommon among meteorites. Its pale interior and fresh texture reflect the primitive mineralogy of this rare extraterrestrial rock.

Features
• Name: NWA 15915
• Type: Achondrite
• Classification: Ungrouped (Mg-rich clinopyroxenite)
• Dimensions: approx. 6 × 4 × 3 mm
• Weight: 0.4 g
• Origin: Likely formed in a differentiated planetary body
• Found: Recovered near Aougrout, Algeria
• Form: Fragment
• Discovery Date: 2022
• Certification: Included, issued by members of leading meteorite associations

Scientific and Physical Characteristics
NWA 15915 is classified as an ungrouped achondrite composed predominantly of Mg-rich clinopyroxene, making it mineralogically distinct from most known achondrite groups. Petrographic studies show a coarse-grained protogranular texture dominated by nearly pure augite with minor enstatite and accessory sulfide minerals such as troilite and alabandite. The absence of olivine and plagioclase further distinguishes this meteorite from many other achondritic lithologies. Oxygen isotope measurements indicate that it does not belong to any established meteorite group, confirming its classification as ungrouped. Its unusual mineral chemistry suggests formation within a differentiated planetary body, based on its Mg-rich clinopyroxene composition and oxygen isotope ratios. The exact parent body remains unknown.