542.6g LL7 Poikiloblastic Chondrite Meteorite Main Mass I NWA 17585
On Offer: 542.6g LL7 poikiloblastic chondrite meteorite classified as NWA 17585
Classification: Ordinary Chondrite (LL7)
Year found: 2025
Country: Morocco
Description: This is the main mass of NWA 17585 LL7, one of my most recent classifications and my first ever LL7. In fact, it's the first 7 of any type I've classified, and was a bit more involved than the many other equilibrated chondrites I've classified in the past. It is a fully equilibrated and recrystallized poikiloblastic chondrite with discontinuous plagioclase networks and no detectable chondrules. The petrographic designation of 7 is relatively rare, and caps off one end of the 3 through 7 petrologic designation spectrum for chondrites. 3.00 being completely unequilibrated and 7 being completely equilibrated. This meteorite represents all of the remaining mass for this classification, with the remainder being used to make the probe mount for the analysis and classification, as well as the 20g type repository sample which is held at TCU.
Backscatter Electron Images (BSE) taken during the analysis and classification of this LL7 meteorite. The buyer will receive digital copies of the BSE images, along with a physical signed certificate of authenticity (COA).
Dustin working on the analysis and classification of a meteorite at the University of Colorado Boulder's microprobe lab (EPMA).
What you get: 542.6g LL7 Chondrite specimen as shown, digital copies of BSE images, and signed Certificate of Authenticity.
SEE OFFICIAL METEORITICAL SOCIETY ENTRY BELOW
| Northwest Africa 17585 | |||||||||||||||||||||||||||||||
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| Basic information |
Name: Northwest Africa 17585 This is an OFFICIAL meteorite name. Abbreviation: NWA 17585 Observed fall: No Year found: 2025 Country: Morocco Mass: 583 g |
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| Classification history: |
This is 1 of 112 approved meteorites classified as LL7. Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) |
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| Comments: | Approved 20 May 2025 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 114:
Northwest Africa 17585 (NWA 17585) Morocco Purchased: 2025 Jan Classification: Ordinary chondrite (LL7) History: A single stone was purchased in January 2025 by an anonymous collector in Morocco from El Houssini Abdurrahim. Physical characteristics: A single dark stone of approximately 583 g, with a mostly wind polished exterior. Some weathered black fusion crust remains. Saw cut reveals a dark coarse grained brecciated interior with occasional small metal blebs. Petrography: (D. Dickens, LMAC) Examination of a polished microprobe mount and BSE images shows a breccia with a recrystallized texture of low-Ca pyroxene, sodic plagioclase, olivine, and Ca-pyroxene grains ranging from 25 µm to >100 µm. Plagioclase occurs as discontinuous networks. Plagioclase and olivine are often poikilitically enclosed by low-Ca pyroxene. Abundant triple junctions are present. Ubiquitous metal and sulfides are found interstitially and embedded throughout the silicates, often at submicron sizes. No chondrules or relict chondrules were observed. Accessory phases include kamacite, taenite, and troilite. Geochemistry: (D. Dickens, LMAC) Olivine Fa30.5±0.3, range Fa30.1-30.9, n=7; low-Ca pyroxene Fs24.8±0.1Wo2.0±0.1, range Fs24.3-25.1Wo1.8-2.1, n=6; feldspar An12.4±1.0Or5.2±2.0, n=7. Classification: Ordinary chondrite (LL7) Type 7 based on recrystallized texture, discontinuous plagioclase networks, abundant triple junctions, and Wo content in low-Ca pyroxene. Specimens: Type specimen with TCU |
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| Data from: MB114 Table 0 Line 0: |
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