Description: IMCA # 3948, IMCA # 5051INTERNATIONAL METEORITE COLLECTORS ASSOCIATIONAuthenticity GUARANTEED HELLO ALL OLD AND NEW GUESTS!!! We are a team of meteorite and fossil hunters.We search worldwide for new and known meteorites. Since 1995, we have mounted expeditions to Tsarev, Brahin, Kunya Urgench, Dronino, Markovka, Seymchan, Sikhote-Alin and many others in Russia and nearby. We have also collected many meteorites from North Africa, the Middle East, Europe and the United States.We have gathered samples of almost all types of known meteorites, including a large collection of lunar meteorites. We are on the world market since 2000, and on eBay since 2004. We ship worldwide from USA. We easy combine shipping. We accept different ways of payments, but PayPal is very preferred. As always we hope the best is in future. We'll make a very good business with all you our friends and partners. Please do not hesitate ask us any questions. Happy bidding! Cometshop team NWA 12676 and Tassédet 004 These are two publications for same meteorite for sure. It is a meteorite shower. Classification: Ordinary Chondrite H5-melt breccia Northwest Africa 12676 (NWA 12676)(Northwest Africa)Purchased: 2019Classification: Ordinary chondrite (H5, melt breccia)History: The meteorite was purchased from a local meteorite dealer in Niger.Physical characteristics: Three dark brownish fragments without fusion crust.Petrography: The meteorite is a melt breccia composed of H5 chondritic regions (plagioclase grain size about 20 μm) and abundant up to 1 cm wide recrystallized melt rock veins and pockets with characteristic FeNi metal and sufide spherules. Some spheres are up to 6 mm in apparent diameter. Tassédet 004 ~18°40’30"N, ~7°23’53"EAgadez, NigerFind: 2016Classification: Ordinary chondrite (H5, melt breccia)History: A large stone of 405 kg was found around 5 km SE of Akokan. It is probably part of a large strewnfield extending for kilometers. Tassédet 004 is widely traded under the name "Tchifaddine."Physical characteristics: Interior shows little to no signs of weathering. Exterior largely dark colored with protruding metal clasts, typically cm-sized.Petrography: Examination of multiple kg of material shows considerable variation in petrography and clast size. This description is based on two representative slices (10 × 8 cm and 18 × 18 cm) and two polished microprobe mounts. The polished slices are dominated by black rounded clasts, surrounded by lighter-colored quenched melt and igneous-textured microporphyritic melt domains. The black clasts show an even distribution of metal and sulfide, typically <500 μm across, and significant porosity as vesicles 10 to 200 μm, some with euhedral grains protruding into the voids. Rare melt pockets to 100 μm. In the two sections, the chondrules in the black clasts are largely integrated into the matrix. A few PO and BO chondrules were recognized. The silicates contain an abundance of small, <1 μm, sulfide and metal grains. Clast metal dominated by kamacite, lacks Neumann bands, is anhedral though with curved outlines. It is typically single crystal, though some show a lath-like martensitic texture. Most kamacite grains have a "frothy" coating of troilite. Troilite is single crystal to polycrystalline and lacks shock lamellae. Metal/troilite grains >2 mm in the melt show eutectic textures. Grains smaller than 2 mm consist of Fe-Ni spheres with coatings of troilite. Chromite is a common accessory as anhedral grains to 200 μm. Feldspar, as anhedral grains, have a wide size distribution from <10 to >50 μm.Geochemistry: (L. Garvie, ASU) Black clast: Olivine Fa19.3±1.2, range Fa18.5-22.1, FeO/MnO=39.9±2.9, CaO to 2.2 wt%, Cr2O3=0.1±0.03, range 0.04 to 0.14 wt%, n=9. Low Ca pyroxene, Fs16.7±0.9Wo1.8±0.5, FeO/MnO=23.4±2.5, n=10. Two high-Ca pyroxene grains found, Fs6.8Wo44.4 and Fs6.1Wo45.4. Feldspar Or2.0±0.4Ab76.2±0.9, n=5.Classification: H5-melt breccia. Low weathering, W1, and high shock. Mineralogy and petrography are similar to the Gao-Guenie H5 melt breccia (Schmieder et al., 2016). Tassedet 004 is widely traded under the name Tchifaddine Here we offer a small complete slice of 15.2 gram. Thickness is about 2 mm. SHIPPING: 1 . Within USA will be $6.2. Worldwide will be $15. GOOD LUCK.
Price: 60.99 USD
Location: Colorado Springs, Colorado
End Time: 2024-10-21T17:24:09.000Z
Shipping Cost: 9 USD
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