関連する実験動画
Updated: Jul 12, 2026

08:14
Atom Probe Tomography Analysis of Exsolved Mineral Phases
Published on: October 25, 2019
まとめ
新しい鉱物であるスタンフィールドライトが隕石で発見されました. その化学組成,特にマグネシウムと鉄の比率は,隕石の種類によって異なります.
科学分野:
- ミネラロジーは,鉱物学です.
- 宇宙化学 (コスモケミストリー)
- 地質学 地質学 地質学
背景:
- 隕石は,地球外の鉱物学の洞察を与えてくれます.
- ミネラル組成を理解することは,地球外物質を分類するのに役立ちます.
研究 の 目的:
- 新しい鉱物,スタンフィールドライトを特定し,特徴づけること.
- 異なるタイプの隕石におけるスタンフィールド石の化学的変化を分析する.
主な方法:
- ミネラロジカル分析
- X線 difrractionによるX線 difrractionによるX線 difrractionによるX線 difrractionによるX線 difrractionによるX線 difrractionによるX線 difrractionによるX線 difrractionによるX線 difrractionによるX線 difrractionによる
- 光学顕微鏡による光学顕微鏡です.
- 化学分析 化学分析とは
主要な成果:
- スタンフィールド石,Ca ((4) (((Mg,Fe) ((5) ((PO ((4)) ((6),エスタービル・メソシデライトといくつかのパラサイトで発見された.
- スタンフィールド石のMg:Fe比は,エスターヴィル石の1.5から,パラサイト石の約15まで幅がある.
- スタンフィールドライトの性質は,Mg3(PO4) 2-Ca3 ((PO4) 2) システムの中間化合物と似ています.
結論:
- スタンフィールド石 (Stanfieldite) は,特定の隕石分類に含まれる,新たに特定された鉱物です.
- 変数Mg:Fe比は,異なる隕石におけるスタンフィールド石の異なる形成条件または起源を示唆しています.
さらに関連する動画
11:50Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
Published on: June 13, 2015
09:45Laboratory Simulation of an Iron(II)-rich Precambrian Marine Upwelling System to Explore the Growth of Photosynthetic Bacteria
Published on: July 24, 2016
関連する概念動画
Minerals
Minerals are essential nutrients that the human body needs in small amounts to work properly. They play a vital role in many bodily functions, such as building strong bones and transmitting nerve impulses. Some minerals are needed for hormone production or to maintain a normal heartbeat. Major minerals include calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium, while trace minerals include iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.
Acid Mine Drainage
Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten aquatic...
Microbes and Other Elemental Cycles
Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
Imperfections in Crystal Structure: Non-Stoichiometric Defects
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
Gravimetry: Inorganic And Organic Precipitating Agents
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
Qualitative Analysis
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...