lazurite
enUKlaz·u·rite
L0080800 (lăz′yo͝o-rīt′, lăz′ə-, lăzh′ə-)lazurite
(ˈlæzjʊˌraɪt)laz•u•rite
(ˈlæz əˌraɪt, ˈlæʒ ə-)n.
单词 | lazurite |
释义 | lazuriteenUKlaz·u·riteL0080800 (lăz′yo͝o-rīt′, lăz′ə-, lăzh′ə-)lazurite(ˈlæzjʊˌraɪt)laz•u•rite(ˈlæz əˌraɪt, ˈlæʒ ə-)n. LazuriteenUKlazurite[′laz·ə‚rīt]Lazurite(lapis lazuli), a mineral of the silicate subclass with a skeletal crystal lattice structure similar to that of sodalite. The chemical composition of lazurite is (Na, Ca)8[A1SiO4]6-(SO4 Cl, S)2. The mineral crystallizes in the isometric system, but crystals are rare. Most commonly it is granular or in compact masses of dark blue, violet, or greenish blue color. The hardness is 5.5–6.0 on Mohs’ scale, and the density is 2,380–2,420 kg/m3. Lazurite occurs in crystalline limestones along the contact boundary between the latter and alkaline syenites in association with pyrite, glaucolite, and other minerals. The largest known lazurite deposits are in Afghanistan (Badakhshan). In the USSR there are deposits in the vicinity of Lake Baikal and in the Tadzhik SSR. Lazurite is a valuable ornamental material and is also used in the preparation of the blue pigment ultramarine. |
随便看 |
|
英语词典包含2567994条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。