Tisserlitine 001-Meteorit Mondfeldspathische Regolithbrekzie, teilweise hydrothermisch verändert. - 12.22 g - (1)

Description:

Tisserlitine 001 Lunar feldspathic regolithic breccia, partially hydrothermally-altered.
12.22 grams.

Found in December 2019 in region of Kidal in Mali, location coordinates 21.325°N, 0.729°E.

Tisserlitine 001 is the ONLY lunar meteorite to be classified with hydrothermal alternation. This represents a whole different level of lunar meteorite and consists of a massive specimen with many beautiful physical characteristics and incredible size. This is an incomparable, important lunar meteorite with regolithic attributes and indications of secondary partial hydrothermal alteration due to its history.
The Tisserlitine 001 lunar meteorite is a beautiful brecciated lunar meteorite, with a very complex interior in comparison to many feldspathic breccia lunar meteorites. This is extremely rare and scientifically important lunar meteorite.

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Classified and studied by world renowned and profoundly respected Dr Anthony J. Irving and team at department of Earth and Space sciences, University of Washington.


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OFFICIAL CLASSIFICATION DATA SOURCE:

Physical characteristics: All specimens (many of which have a flattened slab-like form) lack fusion crust and exhibit medium-brown, "knobby" exterior surfaces. Interiors of stones have an overall tan to pinkish hue with obvious light gray, dark gray and whitish clasts plus some visible small grains of metal.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Two separate endcut specimens were studied. Both are samples of the same breccia material, composed of mineral clasts of anorthite, olivine, pigeonite, subcalcic augite, augite and orthopyroxene, plus sparse lithic clasts of spinel troctolite, set in a fine grained microvesicular matrix containing accessory altered kamacite, troilite, taenite and pentlandite. Secondary calcite is present pervasively in one of the two specimens studied and in places may be replacing original glass. Olivine grains in both studied specimens have been partially replaced by inhomogeneous phyllosilicate-rich assemblages, which apparently are hydroxylated (as evidenced by systematically low oxide analytical sums of 88-90 wt.% and absence of measurable F and Cl), and which are very Mn-deficient (yielding very elevated FeO/MnO ratios in the range 150-250). Troctolitic clasts are composed predominantly of anorthite and olivine with accessory Cr-pleonaste, low-Ca pyroxene and/or higher-Ca pyroxene.

Geochemistry: Olivine (Fa17.3-32.1, FeO/MnO = 76-100, N = 15), anorthite (An95.4-99.0Or0.2-0.0, N = 7), pigeonite (Fs18.2-26.8Wo12.4-4.7, FeO/MnO = 47-54, N = 6), orthopyroxene (Fs16.0-21.6Wo2.2-3.7, FeO/MnO = 51-66, N = 4), subcalcic augite (Fs15.9Wo31.0, FeO/MnO = 41), augite (Fs7.6-7.9Wo42.9-45.6; Fs13.8Wo38.9; FeO/MnO = 36-48, N = 3). Troctolite clast: olivine (Fa18.2-21.2, FeO/MnO = 84-92, N = 4), anorthite (An97.7Or0.0), pleonaste (mg = 0.721, cr = 0.093).

Classification: Lunar (feldspathic regolithic breccia, partially hydrothermally-altered).