Northwest Africa 15915 (NWA 15915)
Officially Classified Ungrouped Achondrite (Mg-Rich Diopsidite)
87.70 Gram Complete End Cut
Museum-Quality Display Specimen | One of the Largest Available
Description
Few meteorites challenge our understanding of planetary evolution quite like Northwest Africa 15915 (NWA 15915). Officially classified as an Ungrouped Achondrite (Mg-Rich Diopsidite), this extraordinary meteorite represents one of the rarest and most scientifically enigmatic igneous rocks ever recovered from our solar system.
Offered here is an exceptional 87.70 gram polished end cut—the largest specimen currently available from my personal collection. It is a true museum-quality example, combining remarkable scientific importance with breathtaking natural beauty.
The polished face reveals an intricate crystalline landscape dominated by translucent magnesium-rich diopside crystals, shimmering metallic sulfides, and delicate aqua-green mineralization that produces an appearance unlike virtually any other meteorite available to collectors. Every crystal records the slow cooling of magma deep within an ancient differentiated planetary body billions of years ago.
Equally impressive is the preserved black fusion crust that remains along portions of the exterior—a reminder of the meteorite's violent passage through Earth's atmosphere. The contrast between the pristine fusion crust and the brilliant crystalline interior creates an extraordinary display specimen that is as visually striking as it is scientifically important.
Large specimens of NWA 15915 are exceptionally scarce. With a total known mass of only 2.84 kilograms, pieces of this size rarely become available and are eagerly sought by advanced collectors, museums, and researchers alike.
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Official Classification
- Name: Northwest Africa 15915 (NWA 15915)
- Meteorite Type: Ungrouped Achondrite
- Lithology: Mg-Rich Diopsidite
- Country Found: Algeria
- Year Found: 2023
- Total Known Mass: Approximately 2.84 kg
- Weathering Grade: Low
- Shock Stage: Low
- Officially Classified and Published
A Window Into a Lost World
Unlike ordinary chondrites, which preserve primitive material from the birth of the Solar System, achondrites originate from bodies that experienced volcanic activity, melting, and internal differentiation—processes normally associated with planets.
NWA 15915 is remarkable because it does not belong to any known meteorite group.
Its mineralogy, chemistry, and oxygen isotope composition indicate formation within an extremely reduced environment unlike those represented by any recognized parent body. It appears to preserve material from an ancient differentiated object that followed a unique evolutionary history, one that is not represented elsewhere in our meteorite collections.
Scientists have noted intriguing similarities between NWA 15915 and materials predicted to form under conditions comparable to those of Mercury's mantle, owing to its highly reduced mineral assemblage and magnesium-rich chemistry. However, current evidence indicates that this meteorite did not originate from Mercury itself.
Instead, it likely represents fragments of a long-destroyed planetary body—one that formed during the earliest stages of Solar System evolution and may no longer exist as a recognizable world today.
Every specimen therefore preserves an irreplaceable record of a planetary environment that has otherwise been lost to time.
Petrography & Mineralogy
NWA 15915 possesses one of the most unusual mineral assemblages known among achondrites.
The rock consists almost entirely of coarse, magnesium-rich diopside, producing a beautiful crystalline texture with an average grain size approaching 2 millimeters.
Accessory minerals include:
- Enstatite
- Daubreelite
- Alabandite
- Troilite
- Minor low-nickel kamacite
Perhaps even more remarkable is what is absent.
Unlike nearly every other achondrite, NWA 15915 contains virtually no olivine or plagioclase, making it mineralogically unique and immediately recognizable under microscopic examination.
This distinctive composition is one of the principal reasons the meteorite remains ungrouped, standing apart from all established achondrite clans.
An Extraordinary Display Specimen
This specimen is exceptional not only for its scientific importance but also for its visual appeal.
The polished face displays:
- Brilliant translucent magnesium-rich diopside crystals
- Metallic sulfide inclusions
- Delicate aqua-colored mineral regions
- Exceptional coarse-grained crystalline texture
- Natural black fusion crust preserved around the exterior
Every viewing angle reveals new crystalline features, making this one of the most captivating achondrites available for display.
Whether exhibited under natural lighting or illuminated in a display case, the specimen possesses an unmistakable elegance rarely encountered in meteorites.
Why Advanced Collectors Pursue NWA 15915
Among collectors of rare planetary materials, NWA 15915 occupies a special place because it combines several characteristics that almost never occur together:
- Officially classified ungrouped achondrite
- Extremely small total known mass of only 2.84 kg
- Mineralogy unlike any recognized meteorite group
- Possible analog to highly reduced planetary interiors
- Spectacular coarse crystalline texture
- Outstanding visual beauty
- Excellent state of preservation
- Large museum-sized display specimen
It is both an important scientific specimen and an extraordinary conversation piece—equally at home in an advanced private collection, university department, research institution, or museum exhibit.
UV Fluorescence
One of the most captivating features of this specimen is its remarkable fluorescent response under shortwave ultraviolet (UV) illumination.
When exposed to UV light, portions of the crystalline diopside-rich interior fluoresce in brilliant shades of vivid orange-red, revealing subtle mineralogical variations that are largely invisible under ordinary lighting. This dramatic fluorescence transforms the specimen into an extraordinary display piece, offering collectors a completely different viewing experience after dark.
While the fluorescence has no effect on the meteorite's authenticity or classification, it highlights the unique mineral chemistry that makes NWA 15915 one of the most unusual achondrites known.
This specimen is exceptionally fluorescent and is truly spectacular when displayed under UV illumination.
Specimen Details
- Meteorite: Northwest Africa 15915
- Classification: Ungrouped Achondrite (Mg-Rich Diopsidite)
- Weight: 87.70 grams
- Form: Polished End Cut
- Features: Large display specimen, translucent diopside crystals, metallic sulfides, preserved fusion crust
- Condition: Stable, beautifully prepared, museum quality
Exceptional UV fluorescence with brilliant orange-red luminescence under shortwave ultraviolet light
Included
- 87.70 gram NWA 15915 End Cut
- Protective Display Case
- Streaming Meteorites Certificate of Authenticity (COA)
Authentication & Seller Information
When purchasing from Streaming Meteorites, you are acquiring far more than a meteorite—you are investing in an authenticated piece of planetary history selected under The Streaming Meteorites Standard.
Every specimen is chosen for its authenticity, scientific significance, aesthetic beauty, collector appeal, and long-term value.
Each purchase includes:
- Streaming Meteorites Certificate of Authenticity (COA)
- Lifetime Guarantee of Authenticity
- Professionally identified and accurately described specimen
- Secure, collector-grade packaging
- Backed by over 8,200 meteorites sold and 100% positive customer feedback
A Relic From a Forgotten Planetary World
Billions of years before Earth became a habitable planet, ancient worlds were forming, melting, colliding, and disappearing throughout the young Solar System. Most have long since been destroyed, leaving behind only scattered fragments that occasionally find their way to Earth.
NWA 15915 is one of those survivors.
Its extraordinary mineralogy, unparalleled beauty, and mysterious origin make it one of the most captivating achondrites available to collectors today. Large examples such as this are exceptionally uncommon and represent an increasingly rare opportunity to own a museum-caliber specimen from one of the Solar System's most enigmatic parent bodies.
This is not simply a meteorite.
It is a preserved fragment of a forgotten world—an artifact older than Earth itself, carrying within its crystals a story written at the dawn of our Solar System.