𝐍𝐨𝐫𝐭𝐡𝐰𝐞𝐬𝐭 𝐀𝐟𝐫𝐢𝐜𝐚 𝟏𝟑𝟔𝟖𝟑. Rumuruti chondrite (R3-6). Complet specimen (91.7g)23/07/2022
𝐓𝐚𝐧𝐞𝐳𝐫𝐨𝐮𝐟𝐭 𝟎𝟗𝟏. Mesosiderite. Slice (2g)23/07/2022
They differ from ordinary chondrites mainly in having most of the metal in the form of sulfides, they are more oxidized and contain little metallic Iron and Nickel. They have a matrix with more dust (about 50%), a higher trace element concentration of Zinc and Selenium and a higher Oxygen-17 ratio than ordinary chondrites. Implanted solar wind is found in more than half of the R chondrites analyzed for noble gases until today.
Apparently, R chondrites come from an asteroid’s regolith (surface with loose solid materials). They are called “R” after the Rumuruti meteorite, which fell on 28th January 1934 in the Rift Valley, Kenya.
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