julgoldite造句

• A monoclinic mineral, julgoldite is isostructural to pumpellyite and epidote ( Allman and Donnay, 1973 ).
• Julgoldite is elongated parallel b [ 010 ] and flattened parallel a { 100 } ( Moore, 1971 ).
• The color of julgoldite is usually a deep lustrous black, and it has a hardness of 4.5 and cleavage on the a-axis { 100 } ( Moore, 1971 ).
• Julgoldite has also been found exposed in basalt cavities in the Khondivili Quarry near Bombay, India along with other gas bubbles in the compound lava flows; all of these Ca-Fe silicates formed in different phases of a low temperature environment ( Wise and Moller, 1990 ).
• Like epidote, for which the chemical formula is Ca 2 ( Fe 3 +, Al ) Al 2 ( SiO 4 ) ( Si 2 O 7 ) ( OH ), julgoldite contains additional SiO 4 tetrahedra that are independent of the Si 2 O 7 structural units ( Deer et al ., 1996 ).
• Julgoldite has since been discovered in other parts of the world : Edinburgh, Scotland ( in quartz dolerite ) ( Livingstone, 1976 ) and Norilsk, Taymyr Peninsula, Russia, one of the largest nickel deposits in the world, in metamorphosed basalts and diabases associated with prehnite and laumontite ( Zolotukin et al ., 1965 ).
• The atomic structures of pumpellyites and julgoldites consist of chains of edge-sharing octahedra linked by SiO 4, Si 2 O 7, and CaO 7 polyhedra : in the julgoldite atomic structure, the Ca site, the W site, is a seven-coordinated site with oxygen; the X and Y are two crystallographically independent octahedral sites; and the SiO 4 site is tetrahedral ( Passaglia and Gottardi, 1973 ).