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aragonite    
文石; 文石; 霰石; 霰石



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  • Aragonite - Wikipedia
    Aragonite is a carbonate mineral and one of the three most common naturally occurring crystal forms of calcium carbonate (Ca CO 3), the others being calcite and vaterite It is formed by biological and physical processes, including precipitation from marine and freshwater environments
  • 文石(碳酸盐矿物)_百度百科
    文石(Aragonite),又称霰石,是一种碳酸钙矿物(CaCO3),与 方解石 互为 同质多象变体,属 斜方晶系。 其晶体常呈柱状或矛状,常见假六方对称的三连晶,集合体多为皮壳状、鲕状、豆状、球粒状等形态,颜色以白色、黄白色为主,莫氏硬度3 5-4 5,相对密度2 9-3 0,具有玻璃光泽及贝壳状断口,断口油脂光泽,具不完全的板面解理。 化学组成中钙元素可被锶、铅、锌等替代,形成锶文石、锌文石等变种 [2]。 文石多形成于低温热液环境或外生作用中,常见于海底沉积物、温泉及火山岩裂隙,也可由生物作用形成于贝壳珍珠质层。 该矿物在自然界不稳定,易转变为方解石,生成压力高于方解石 [2-3]。 氧同位素实验表明,0℃-70℃条件下文石-水体系的平衡分馏系数对古沉积环境研究具有参考价值 [3]。
  • 霰石 - 维基百科,自由的百科全书
    文石 (Aragonite),是一种 碳酸鹽礦物。 主要成分为 碳酸钙,与 方解石 同为自然界常见的碳酸鈣 多形體。 文石为 斜方晶系,故形状与三方或六方晶系的方解石不同。 可形成柱狀晶體,偶有分叉 鐘乳石 状称“鋼花”。 虽然常溫常壓下文石的熱力學結構不穩定,但因为动力学因素,在没有 催化剂 存在下需要数千万到数亿万年的時間才能轉化為方解石。 文石主产于 秘魯 、 蒙古 、 捷克 及 斯洛伐克 等地。 除此之外, 美國 的卡爾斯巴德出產 鐘乳石 狀的文石, 西班牙 阿拉貢 礦場出產柱狀文石,后者特称为Aragonite。 位於太平洋的 雅浦島,文石甚至被用作石制貨幣的原料,被稱之為 雅浦島石幣,并沿用至十九世紀。 軟體動物 的殼中也有文石形式(斜方晶系)的碳酸钙。
  • aragonite - 搜索 词典
    6 A conical mineral deposit, usually calcite or aragonite, built up on the floor of a cavern, formed from the dripping of mineral - rich water 一种 锥 状 矿物 沉积, 通常 为 钙 或 霰 石, 由 含 矿物 丰富 的 水 下 滴 而 在 洞穴 的 地上 形成。
  • Aragonite: Mineral information, data and localities.
    The principal member of the Aragonite Group, aragonite is the second most common polymorph of natural calcium carbonate (the most common is calcite) It is significantly less widespread and abundant than calcite and is formed under a much narrower range of physiochemical conditions
  • Aragonite Properties, Occurrence - Geology Science
    Aragonite is a carbonate mineral and its formula is calcium carbonate It has the same formula as Calcite and Vaterite, but has a different crystal structure They are tabular, prismatic or needle-like, often with steep pyramidal or chisel-shaped ends, and can form columnar or spreading aggregates
  • Aragonite - an overview | ScienceDirect Topics
    Aragonite is defined as a metastable form of calcium carbonate (CaCO3) that commonly occurs in travertines, particularly in high-temperature or magnesium-rich environments
  • Aragonite | Carbonate, Calcium, Crystals | Britannica
    Aragonite, widespread mineral, the stable form of calcium carbonate (CaCO3) at high pressures It may be distinguished from calcite, the commoner form of calcium carbonate, by its greater hardness and specific gravity
  • Aragonite - The Pearly Carbonate - MineralExpert. org
    Aragonite is the lesser known cousin of calcite, it is a main component of mollusk shells, corals and pearls It also occurs in many geologic environments
  • Aragonite | CH2CaO3 | CID 6335838 - PubChem
    Aragonite | CH2CaO3 | CID 6335838 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety hazards toxicity information, supplier lists, and more





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