Formation of FeNi metal nodules in the Jilin H5 chondrite,the largest stone meteorite in the world

The Jilin H5 chondrite, the largest known stony meteorite in the world, with its No.1 fragment weighing1770 kg. It contains submillimeter-to centimeter-sized FeNi metal particles/nodules. Our optical microscopic and electron microprobe analyses revealed that the formation of metal nodules in this meteorite is a complex and long-term process, The early stage is the thermal diffusion-caused migration and concentration of dispersed metallic material along fractures to form root-hair shaped metal grains during thermal metamorphism of this meteorite. The later two collision events experienced by this meteorite led to the further migration and aggregation of metallic material into the shock-produced cracks and openings to form largersized metal grains. The shock-produced shear movement and frictional heating occurred in this meteorite greatly enhanced the migration and aggregation of metallic material to form the large-sized nodules. It was revealed that the metal nodule formation process in the Jilin H5 chondrite might perform in the solid or subsolidus state, and neither melting of chondritic metal grains nor shock-induced vaporization of bulk chondrite material are related with this process.

Metallic Reserves of Submarine Manganese Nodules to be Estimated and Harnessed Prudently: Evidence from China's Jiaolong Manned Submersible

Since the discovery of oceanic manganese nodules during the expedition of the British ocean-going ship Challenger from 1872 to 1876, research and development for seabed manganese nodules have never ceased owing to the huge economic inducements. Manganese nodules are the black or dark brown, spherical or massive Mn-bearing ores, deposits of which are found on the sea bottom. The nodules are a mixture of silicate and insoluble potassium permanganates （also with sub-Ti, Fe and Na permanganates） that contain more than 30 kinds of metallic elements, among which those of greatest economic interest are Mn （27-30%）, Ni（1.25-1.5%）, Cu（1- 1.4%）, Co（0.2- 0.25 %）, Fe, Si, and AI, with minor amounts of Ca, Na, K, Ti, B, H and O.

A case of tiny foreign body hidden in the neck for 27 years

Neck trauma has the characteristics of diversity,complexity,and danger.Mild injuries generally require debridement and suturing or symptomatic treatment.In severe cases,acute laryngeal obstruction,subcutaneous emphysema,severe deformation and collapse of laryngeal and tracheal cartilage,or damage to adjacent organs may occur.If not diagnosed in a timely manner or mishandled,it can endanger the patient’s life or leave sequelae.If foreign body residue is caused by head and neck trauma,a reasonable judgment should be made based on the patient’s condition and corresponding measures should be taken.Accurate localization of foreign bodies before and during surgery,as well as appropriate surgical methods,are key to ensuring successful treatment.This article reports a case of a small foreign body in the neck admitted to Xianning Central Hospital at the end of January 2023.