Definition:a rare mineral occurring as emerald green or blue-green crystals. It consists of ahydrated silicate of copper.透視石tòu shì shí,綠銅礦lǜ tóng kuàngFormula: CuSiO2(OH)2Origin:early 19th century:from French,formed irregularly from Greek dioptos“transpa...[繼續(xù)閱讀]

    Definition:An ionic crystal structure in which all bonds are of the same strength,so that nodistinct groups of atoms are formed.中鍵結(jié)構(gòu)zhōng jiàn jié gòu...[繼續(xù)閱讀]

    Definition:one of the tetragonal forms of titanium dioxide,usually found as brown crystals,used as a pigment in paints and inks銳鈦礦ruì tài kuàngOrigin:early 19th century:from French,from Greek anatasis“extension”,with allusion tothe length of the crystals....[繼續(xù)閱讀]

    Definition:High relief is where the most prominent elements of the composition are undercutand rendered at more than 50% in the round against the background.高突起gāo tū qǐOrigin:alto relievo,from ItalianExample:Analysis of the topography across the front al...[繼續(xù)閱讀]

    Definition: In crystallography,a crystal system or crystal family or lattice system is one ofseveral classes of space groups,lattices,point groups,or crystals. Informally,two crystals tendto be in the same crystal system if they have similar symmetries,th...[繼續(xù)閱讀]

    Definition: a tectosilicate mineral with sulfate and chloride. It is a feldspathoid and amember of the sodalite group. Hauyne crystallizes in the isometric system forming translucent,vitreous typically twinned crystals with highly variable color (blue,whi...[繼續(xù)閱讀]

    Definition: an object relative to a locally euclidean space which possesses a specified systemof components for every coordinate system and which changes under a transformation ofcoordinates;amultilinearfunction onthecartesian product of several copies of...[繼續(xù)閱讀]

    Definition:a completely empty space 孔隙 kǒng xìOrigin:Middle English(in the sense“unoccupied”):from a dialect variant of Old Frenchvuide; related to Latin vacare “vacate”; the verb partly a shortening of avoid,reinforced byOld French voiderExample:Soil-roc...[繼續(xù)閱讀]

    Definition:(Crystallography)an imaginary ellipsoidal surface whose axes represent therefractive indices of a crystal for light following different directions with respect to the crystalaxes光率體guāng lǜ tǐOrigin:late 19th century:modern Latin,feminine of La...[繼續(xù)閱讀]

    Definition:reddish elongated junshajiangite grain to 0.3mm in matrix金沙江石jīn shā jiāngshíFormula: Na2K5BaCa(Fe,Mn )8(Ti,Fe,Nb,Zr)4Si8O32 (O,F,H2O)6Origin:named for the locality,Jinshajiang River,Sichuan Province,China...[繼續(xù)閱讀]