Specimen Record TC-00056

Specimen Record
TC-00056

NWA 18592 · Mesosiderite · 687.00 g

This page is the permanent record for the specimen bearing serial TC-00056. It is issued by Treasure Coast Meteorite Co. as a reference for present and future owners. The photographs below show this specific specimen and are the primary means of verifying it.

Identification

Serial
TC-00056
Meteorite
Northwest Africa 18592
Classification
Mesosiderite
Weight
687.00 g
Form
Main mass, largest of the eleven recorded stones
Find location
Northwest Africa
Surface
Natural weathered exterior with pale sediment in the cracks, no coating, no saw cut or polished face
Shock stage
Moderate
Weathering grade
Moderate

Classification record

Published in
Meteoritical Bulletin 115, in preparation (2026). Approved 16 May 2026
Classifier
D. Sheikh, Cascadia
Type specimen
24.6 g, Cascadia Meteorite Laboratory, Portland State University
Total known weight
903 g, eleven stones
Bulletin entry
Meteoritical Bulletin Database, Northwest Africa 18592

Provenance

The Meteoritical Bulletin records the main mass of Northwest Africa 18592 with Brian McDonald. Identification of this 687.00 g stone, the largest of the eleven, as that main mass comes from Treasure Coast Meteorite Co. records. According to the Bulletin writeup, eleven stones were found in northwest Africa in 2024 and were purchased in 2025 by Brian McDonald online from a meteorite dealer in Morocco. The meteorite was submitted by Daniel Sheikh, and a 24.6 g type specimen is held at Cascadia. The 903 g recorded mass covers all eleven stones and is not the weight of this stone.

Photographic record

NWA 18592 mesosiderite main mass, 687.00 g, on white background
The stone on a white background, showing the dark weathered exterior and pale sediment packed into the cracks.
Side view of the NWA 18592 main mass
Side view, showing the blocky exterior broken by fine cracks.
Broad face of the NWA 18592 main mass
Broad face, with a network of thin cracks across the dark weathered surface and pale tan areas along the lower edge.
End view of the NWA 18592 main mass
End view, showing rounded knobby blocks and small sand grains lodged in the cracks.
On verification. The serial number on the accompanying certificate card is an index to this record. The photographs above and the stated weight are what identify this specimen. Meteorite surfaces, clast patterns and cut faces are individual to each stone, so a specimen can be compared directly against these images and weighed against the figure recorded here to two decimal places.
Record issued by Treasure Coast Meteorite Co., IMCA Member #3323, Hobe Sound, Florida.
Issued 7 November 2026. Classification data reproduced from the Meteoritical Bulletin entry cited above.
Questions regarding this record may be directed to brian@tcmeteorites.com.

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from 34 reviews

I'm super happy with my purchase! The item is exactly as pictured. All details match up. I'm very happy with my first purchase.

Theresa Culbertson

Beautiful piece and Treasure Coast was great to work with!

Anonymous

LOVING IT!!!!

Anonymous
NWA 17472 Mars Meteorite, Martian Shergottite, Select Size, in Display Box w/COA

ChatGPT recommended Treasure Coast as a reputable dealer, and, after my own research, i absolutely agree. I have complete confidence in the authenticity of the item I received. It also looks freaking amazing.

Mandi Smith

Great experience with TCMeteorites! Brian is professional, quick to reply, and answers questions in detail. He helped me choose the most suitable shipping option for my country and clearly explained the specimen’s provenance. He took the time to share photos and additional information about the meteorites I was interested in. He also prepared an endcut of a rare meteorite according to my request. The specimen arrived safely and looks great.

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Christopher Clements

Amazing Service

Anonymous

I cannot say enough wonderful things about my experience with Treasure Coast! I purchased a lunar piece as a special gift, and their customer service went above and beyond to make it even more meaningful. After learning the story behind my gift (it was for my 1 year wedding anniversary), they surprised me by including the sweetest personalized card that said “Love you to the moon and back” with my name on it. It was such a thoughtful, unexpected touch and genuinely made the whole experience feel special. The lunar piece itself was wonderful, but the care and kindness they put into my order is what really stood out. This is the kind of customer service you remember. Highly recommend! 🌙❤️

Jinger Wolfe

I cannot say enough wonderful things about my experience with Treasure Coast! I purchased a lunar piece as a special gift, and their customer service went above and beyond to make it even more meaningful. After learning the story behind my gift (it was for my 1 year wedding anniversary), they surprised me by including the sweetest personalized card that said “Love you to the moon and back” with my name on it. It was such a thoughtful, unexpected touch and genuinely made the whole experience feel special. The lunar piece itself was wonderful, but the care and kindness they put into my order is what really stood out. This is the kind of customer service you remember. Highly recommend! 🌙❤️

Jinger Wolfe

A really rare chondrite. An H3 with very low weathering with lots, lots of metal.

Andreu del Campo
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Andreu del Campo

this is Lavyansh Bhardwaj from Delhi Rohini sector 22 this is awesome to have collected the part of moon 🌙

Anonymous

A beautiful chondrite specimen, perfect for any collection. As always, Bryan is incredibly kind and helpful when answering questions or providing explanations about the specimen; he is also very pleasant to chat with, beyond the transaction itself. I highly recommend buying from him.

Anonymous
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