The δ30Si and δ18O of the cherts from the Gacun Kuroko-type deposit were determined for the first time and have been compared with those of the silica chimneys from modern seafloor hy-drothermal fields.
本文首次报道了川西呷村黑矿型矿床硅质岩的硅、氧同位素组成,其δ~(18)O为12。
a black mineral that is an ore of niobium and tantalum.
一种黑色矿物，是铌、钽矿石。
a brownish-black mineral; the major source of chromium.
一种褐黑色矿物，是铬的主要来源。
Eye-brow highlighting : Use a black mineral pigment to outline the eye-brow.
画黛眉：用黛(一种黑色矿物)来修饰眉型。
a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals.
一种黑色矿物，由钇、铒、钽和其他矿物的氧化物组成。
I think these minerals with dark color are mica. I have seen it before.
我认为花岗岩内的这些黑色矿物是云母，我以前曾见过此类矿物。
a black mineral consisting of basic manganese oxide; a source of manganese.
一种黑色矿物，由基性氧化锰组成，是锰的来源。
They are mica which makes up the rest of the total rock.
这块岩中余下的黑色矿物部分就是云母。
a hard heavy dark mineral that is the chief source of tin.
一种硬而重的黑色矿物，是锡的主要来源。
a complex black mineral occuring in pegmatites.
一种混合的黑色矿物，见于结晶花岗岩中。
a hard gary-black mineral consisting of corundum and either hematite or magnetite; used as an abrasive (especially as a coating on paper).
一种坚硬的灰黑色矿物，由刚玉和赤铁矿或磁铁矿构成，用作研磨剂（尤其用在砂纸外表）。
A mixture of black manganese oxide minerals.
硬锰矿一种黑色氧化锰矿的混合物
A soft, black to dark gray mineral, MnO2, the commonest and most important secondary ore of manganese.
软锰矿一种软的，黑色至灰黑色的矿物质，MnO2，是最普通最重要的锰矿
A light yellow, red - brown, or black mineral, SnO2, that is an important tin ore.
锡石一种淡黄色、红褐色或黑色的矿物，SnO2，是一种重要的锡矿
A black or blackish-red to brick-red mineral, essentially Fe2O3, the chief ore of iron.
赤铁矿，赤血石一种从黑色或黑红色到砖红色的矿物质，主要包括Fe2O3，是铁的主要矿石
a greenish gray or black silicate of iron and aluminum.
一种绿灰色或黑色的铁和铝的硅酸盐矿物。
A dark green to brown or black mineral, ZnAl2O4.
锌尖晶石一种暗绿至棕色或黑色的矿物，ZnAl2O4
a black magnetic mineral consisting of magnesium carbonate; a source of magnesium.
一种黑色的磁性矿物，由碳酸镁组成，是镁的来源。
So the dark mica in this granite should be called biotite.
那么．在这块花岗岩中的黑色云母类矿物就应当叫做黑云母了。