SKU: 89564841976

NWA 18118 Oriented H5 Ordinary Chondrite, 644g Main Mass Individual

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Description

NWA 18118 Oriented H5 Ordinary Chondrite, 644g Main Mass IndividualNWA 18118, an oriented H5 main mass NWA 18118 is an officially classified H5 ordinary chondrite from Northwest Africa, offered here as a 644 gram oriented main mass individual. The total known weight recorded in the Meteoritical Bulletin is 682 grams, so this single stone accounts for the large majority of all documented material for NWA 18118. It is offered uncoated and substantially complete, with only a small classification window removed for

NWA 18118, an oriented H5 main mass

NWA 18118 is an officially classified H5 ordinary chondrite from Northwest Africa, offered here as a 644 gram oriented main mass individual. The total known weight recorded in the Meteoritical Bulletin is 682 grams, so this single stone accounts for the large majority of all documented material for NWA 18118. It is offered uncoated and substantially complete, with only a small classification window removed for analysis.

Structure and surface features

The stone shows a domed, shield-like profile consistent with an oriented flight position, in which a single leading face was held forward as the meteorite descended through the atmosphere. The exterior shows tones of brown and gray, with contoured surface relief and light desert patina from its time on the ground. A small area of caliche, a natural carbonate deposit picked up in the field, is present on one surface. The classification window exposes a fresh interior, where metal grains are visible as bright flecks alongside scattered chondrules set in a tan to gray matrix. Minor brown oxidation staining is present in the interior, as is typical of a desert find.

Discovery and provenance

NWA 18118 was recovered in Morocco and entered the scientific record with its classification published in the Meteoritical Bulletin, database entry 114, with a recovery year of 2024. The specimen carries a painted collection number on its reverse, consistent with documented Northwest African field material. It is offered with Treasure Coast Meteorite Co. provenance and the classification details noted below.

Scientific context, the H5 ordinary chondrite

Ordinary chondrites are the most abundant class of meteorite, and the H group is defined by high total iron content, a significant portion of it present as free metal. The petrologic type 5 indicates thermal metamorphism within the parent asteroid that partially equilibrated the original chondritic material while leaving chondrules still discernible. NWA 18118 was classified as H5 by magnetic susceptibility measurement. The Meteoritical Bulletin notes that this classification carries larger than normal uncertainty, which we state plainly here in the interest of full transparency. The official type of record remains H5.

Frequently asked questions

Is NWA 18118 officially classified?
Yes. It is an officially classified H5 ordinary chondrite recorded in the Meteoritical Bulletin, entry 114.

What does oriented mean?
An oriented meteorite held a stable position during atmospheric flight, ablating preferentially on its leading face and developing a directional, often domed or conical, shape. Oriented stones are sought after by collectors for that flight history.

Is this the complete known mass?
The total known weight on record is 682 grams. This specimen is the 644 gram main mass, with the balance accounted for by the classification sample and cutting loss.

Has the stone been coated or treated?
No. It is offered in natural condition, with no epoxy or stabilizing coating.

Collector significance

Owning the main mass of a classified meteorite places the single most significant piece of that find into one collection. At 644 grams against a 682 gram total known weight, NWA 18118 brings together main mass status, an oriented flight form, and an official H5 classification in one specimen. The full classification can be reviewed in the Meteoritical Bulletin entry for NWA 18118. Treasure Coast Meteorite Co., IMCA #3323.

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SKU: 89564841976

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4.7 ★★★★★
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ATS
New York, US
★★★★★ 5
Any Francis Duncan mystery is a joy
Format: Paperback
As a lover of classic British mysteries, my chance discovery of this author from the mid-20th Century has been a real joy. Every page keeps my interest, which I cannot say about many mysteries I read by well-regarded authors. Duncan's books are also not guilty of that staple of modern mysteries that I am getting so weary of: a detective drowning in their personal angst, fighting emotional slings and arrows, and of course, a tragic love life, etc, which takes up so much of the bulk of his or her attention. Duncan's Miss Marple-like character Mordecai Tremaine is in many ways a very ordinary type of person, but he is able to blend in with quite different types of social groups; groups which fester with secrets, lies and a hidden murderer...until Tremaine untangles it all in his unassuming but brilliant way. He does it by observing people as much as by physical clues, which is similar to the Agatha Christie approach. This mystery, "Murder for Christmas" was not the typical "murder at a country house at Christmas" mystery which I thought it would be. It was quite surprising, startling, enthralling, and a joy to read.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 23, 2018
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Verified Purchase
G. P. B.
Port Orchard, US
★★★★★ 4
Delightful Golden Age Mystery
Format: Paperback
Retired tobacconist Mordecai Tremaine is invited to a Christmas house party by a man he doesn't know well. He chooses to go, because of the intriguing postscript stating that "something was wrong" in the household. That something was most definitely wrong was proven when a dead Father Christmas was discovered under the tree on Christmas Eve. Mordecai uses his sharp eye and keen reasoning to investigate his fellow house guests to determine the motive and method of the crime. This was a delightful mystery, with an engaging protagonist and a well imagined cast of characters. The mystery itself was intelligent, believable, and nicely plotted. Duncan's writing wasn't perfect; there were repeated phrases and the occasional awkward sentence. Despite that, I would most definitely recommend this nearly forgotten Golden Age mystery. I will most certainly be reading more of Mordecai's adventures.
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Reviewed in the United States on December 22, 2018
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Constant Reader
Natrona Heights, US
★★★★★ 3
Bit of a snore
Format: Kindle
Mordecai Tremaine is a retired tobacconist and an amateur detective. He is invited to spend Christmas with an acquaintance in a country manor house who specifically tempts Mordecai Tremaine by hinting at a threat. This story has a period feel to it with servants, snow, secrets, and murder. The pacing is laborious. I hoped that the pace would improve when a murdered person in a Father Christmas suit is found on the floor in front of the Christmas tree. Alas, it was not to be. The character list is very long, and the characters are not well developed. This is the first book in a series featuring Mordecai Tremaine (who is only referred to by last and first names). I have a soft spot for British mysteries, including period British mysteries like those by Ngaio Marsh. While the mystery has its twists and turns as Mordecai Tremaine investigates to assist the police, it never quite clicked for me. I am not likely to read any of the other books in the series.
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Reviewed in the United States on December 6, 2018
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Grandma
West Palm Beach, US
★★★★★ 5
Enjoyable Classic mystery
Format: Kindle
I am an avid fan of vintage mysteries, and “English country house” mysteries are among my very favorites in that genre. I enjoyed this one very much and was pleased to see that there were two others available and a couple more being published. This book was my idea of a terrific cozy type mystery, and I enjoyed it very much. The Christmas setting added to its appeal. Mordecai Tremayne, the detective in this story is just eccentric enough to be interesting without being stereotyped. He observes people, and makes deductions based on these observations, along with his knowledge of human nature. In retrospect, he is almost a bit like male version of Miss Marple, although this did not strike me as a I read the book. This was a fun book to while away a few hours, and I look forward to reading others in this series. Highly recommended for fans of vintage mysteries, and cozies.
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Reviewed in the United States on August 17, 2018
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smithirowa
Waukegan, US
★★★★★ 4
Leaves You Wanting More
I read about this novel right after Christmas, but I decided to order it anyway. It was not supposed to arrive until some time in February, so I was pleasantly surprised when I received it within a few days of my order. With the snow finally falling in the Chicago area, I knew this would be a good time to read this book. The book begins with a summary of the case with somewhat overwrought language. However, as it moves on to the characters, it becomes more successful. It is important to remember that the novel was written in the 1940s, which means that we have a world that is slower paced than the 21st century. Of course we are looking at a wealthier segment of society in rural England, but this pace allows us to study the scenery and the characters more carefully. This is a world with a mansion that can house a number of guests for Christmas with these guests being able to stay over a few days with a pleasant host. The characters are mostly forgettable with the major exception of Mordecai Tremaine as the amateur detective who helps solve the case. He is a character who is unforgettable. The ending is well plotted, and it leaves the taste of a delicious Christmas dinner in the mouth of the reader. The author, Francis Duncan, wrote in the 1930s and 1940s, and this is the first book of his to be republished. I can only hope that other books by this author will be republished as well and republished soon or at least in time for me to read them by next Christmas. Without knowing anything about his other books, it would be nice to think that I could have other seasonal stories waiting for me in the future. The ending still remains in my mind, even several weeks after I have read the book. It would be delicious to meet Mordecai Tremaine again.
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Reviewed in the United States on January 26, 2016

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