MAGNIFICENT GRAPEVINE MESA METEORITE!!!
RECENT NEW FIND COLLECTED IN ARIZONA, USA!!!
RARE CARBONACEOUS CBa METORITE!!!
FABULOUS FRAGMENT WITH GORGEOUS PATINA!!!
VERY LITTLE MATERIAL IS AVAILABLE TO THE COLLECTOR!!!
SPECIMEN WEIGHT: .24 GRAMS!!!
FREE GEM CASE!!!
| Grapevine Mesa | |||||||||||||||||||||||||||||||
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| Basic information | Name: Grapevine Mesa This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2021 Country: United States Mass: 550 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 8 approved meteorites classified as CBa. | ||||||||||||||||||||||||||||||
| Comments: | Approved 15 Dec 2021 | ||||||||||||||||||||||||||||||
| Writeup | Writeup from MB 110: Grapevine Mesa 35°58’54.00"N, 113°59’49.50"W Arizona, United States Find: 2021 Feb 6 Classification: Carbonaceous chondrite (CBa) History: On the 6 February 2021, Todd Parker and Robert Ward were searching for gold with metal detectors on Grapevine Mesa, east of Meadview, Mohave County, Arizona. Parker detected a signal, which turned out to be three pieces weighing 252.5 g of a metal-rich meteorite. Together, they recovered 550.3 g in a 2 × 2 m area. Physical characteristics: Exterior of the stones are rusty with patches of fusion crust. Interior of a 4 × 4.5 cm slice shows rounded to angular silicate fragments (to 1 cm) hosted by rounded to anhedral metal grains to 0.7 cm. Metal constitutes 69 areal% of the slice. The metal sizes, shapes, and distribution closely resemble that of Bencubbin. Petrography: A 2 × 1.5 cm polished section shows metal grains composed of micron-sized polycrystalline kamacite containing an abundance of micron-sized troilite blebs and stringers (~1 areal%). Silicates consist of magnesian nonporpyritic silicate fragments with a cataclastic texture. White orange-stained silicate fragments separated by black opaque material hosting sub-mm-sized silicate fragments and rounded troilite and kamacite blebs. Thin terrestrial oxide veins are present around the metal grains. Geochemistry: Oxygen isotopes (K. Ziegler, UNM): Seven fragments analyzed by laser fluorination gave δ18O = 6.949, 5.840, 4.998, 4.541, 5.968, 5.283; δ17O = 3.467, 2.239, 2.456, 1.485, 2.409, 2.091; Δ17O = -0.202, -0.845, -0.183, -0.913, -0.742, -0.699 (linearized, all per mil, TFL slope = 0.528). Average of the seven analyses gives δ18O = 5.596±8.848, δ17O = 2.358±0.646, Δ17O = -0.597±0.323. EPMA (L. Garvie, ASU): Low Ca pyroxene Fs3.17±0.79Wo1.88±2.62 (n=4), Al2O3 = 0.4 to 3.2, TiO2 = 0.1 to 0.2, and Cr2O3 = 0.4 to 0.7 (all wt%); High Ca pyroxene Fs3.37Wo38.45 (n=1), Al2O3 = 7.9, TiO2 = 1.0, and Cr2O3 = 1.5 (all wt%); Olivine Fa3.67 and 4.71; Metal (wt%) Ni = 7.03±0.70, Co = 0.33±0.04, Cr = 0.20±0.09, and P = 0.33±0.04. Classification: The meteorite mineralogically matches that of the subgroup A (CBa) Bencubbin-like carbonaceous chondrites. The oxygen isotopes follow on an extension of the current bencubbinite field. Specimens: Largest mass of 61 g is with Robert Ward. 21 g and a polished mount at ASU. | ||||||||||||||||||||||||||||||
| Data from: MB110 Table 0 Line 0: |
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