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This is a beautiful individual of NWA 11991, a chondrule rich meteorite that was formed in the early solar system. If you have any questions please let me know.Northwest Africa 11991 (NWA 11991)(Northwest Africa)Purchased: 2018 JanClassification: Ordinary chondrite (LL3)History: Found in northwest Africa.Physical characteristics: In cut slices, interior is light gray to light brown with slight weathering staining, has well defined chondrules and metal contents typical of LL chondrites.Petrography: (A. Ruzicka, S. Goudy, Cascadia) Thin section shows well-defined chondrules, many with glassy mesostases, and good examples of cluster chondrite texture with little intervening matrix. Multiple bleached chondrules. Analysis in reflected light shows thin section contains roughly 2.3% metal with ~10% metal weathered, and roughly 4.2% troilite; largest slice contains 2.8±0.3% metal and 5.4±0.6% troilite (area% values). Based on olivine, shock stage is S5. Matrix is composed chiefly of 10 μm grains of ferroan olivine and albitic feldspar, reminiscent of that found in Lut 005 and Lut 006.Geochemistry: (M. Hutson, Cascadia) Olivine (Fa21.6±9.9, N = 156; Cr2O3 0.07±0.05 wt%, N = 126).Classification: LL3, estimated subtype 3.5. LL indicated by low metal content and minor weathering. Type 3 indicated by texture, presence of chondrule glass, and variable olivine composition. Subtype estimated as 3.5 based on olivine Fa variability (subtype 3.4-3.6) and chrome content in olivine.Specimens: A total of 48.4 g in two slices, a polished thin section, and potted butt are available at Cascadia. Mr. James Tobin holds the main mass.Data from:
MB107
Table 0
Line 0:
Place of purchase: Tucson
Date: P 2018 Jan
Mass (g): 1020
Pieces: 3
Class: LL3
Shock stage: S5
Weathering grade: W1
Fayalite (mol%): 21.6
Classifier: M. Hutson, S. Goudy, A. Ruzicka, Cascadia
Type spec mass (g): 48.4
Type spec location: Cascadia
Main mass: Tobin
Comments: Specimen number CML0091.; submitted by Alex Ruzicka Included: Meteorite and Specimen Card only.Shipping is usually sent via US Postal Service (USPS) and I combine multiple purchases for free. Insurance is always recommended, as no two meteorites are the same and not replaceable. Cost of U.S.delivery insurance is 2% of the total or $2.00, whichever is more. USPS International insurance policy requires an upgrade to Express Mail.
