You are able to choose one or more of the specimens shown in the photos. Each specimen comes in a protective display case along with a business card sized COA. The bottom of each case is marked with that particular meteorites S. Tutorow collection number that corresponds with the number on the Meteorites COA. This is an official meteorite from the S. Tutorow Collection. A respected meteorite supplier and author who upholds to the highest proviance standards in the world of Meteorites.
Below is information copied from the "The Meteoritical Society" website........... ----------------------------------- Northwest Africa 6697 (NWA 6697)
Petrography: Aqueously altered, ~35 vol% phyllosilicate-rich matrix. Chondrules lack glassy mesostasis. Opaques in the matrix are mainly iron-sulfide and magnetite. Many chondrules are surrounded by ~50 μm phyllosilicate-rich rims. Sparse metallic Fe-Ni in chondrules; metal grains are small and surrounded by sulfide and/or magnetite. Lacks coarse metal grains in chondrules and matrix. Chondrules ~800 μm (compared to 270 µm for CM chondrites). Many chondrules have irregular convoluted boundaries and abundant chondrule fragments in the matrix. Most chondrules are type-I PO and POP and a few BO. AOIs range in size from ~500 to ~1500 μm; they constitute ~2 vol.% of the rock.
Geochemistry: Oxygen isotopes (Byeon-Gak Choi, Seoul-NU): Replicate analyses of acid-washed whole rock samples by laser fluorination gave δ18O = 2.653, 2.475; δ17O = -2.525, -2.358; Δ17O = -3.923, -3.633 (all per mil).
Classification: Carbonaceous chondrite, ungrouped, petrologic grade 2. The whole-rock O-isotopic composition is on the CCAM line, indicating that the rock is not closely related to CR chondrites