近来在公开刊物上发表的有关我省侵入岩某些研究论文中,提到副矿物中存在硅碳石(SiC),並把该矿物视为判断岩石的幔源或同熔型成因的标志矿物(叶水泉,1986;张兴隆,1987),对此引起岩矿工作者的关注。但据此矿物产出的地质条件,本人对我省某些侵入岩(如苏州花岗岩,安基山石英闪长玢岩)是否确有来自地幔的天然硅碳石矿物,提出不同的看法。硅碳石(moissanite),晶体为薄板状,有时具(1014)双晶,底面解理不完善,硬度大(9.5),比重大(3.218),金属光泽,晶面常有晕彩色,折射率极高,双折射率大,绿到黑色,有时为蓝色,弱多色性Ne—蓝绿,No—橄榄绿或Ne—深蓝,No—浅蓝,色散强,一轴晶正光性。该矿物具三种同像变体,即α Recent research papers published in public journals on intrusive rocks in our province mention the presence of silicon carbide (SiC) in the sub-minerals and use the mineral as a hallmark mineral for determining mantle origin or formation of rocks (Ye Shuiquan, 1986; Zhang Xinglong, 1987), which caused the concern of rock and mine workers. However, according to the geological conditions of the minerals produced, I made some different opinions about whether some intrusive rocks in our province (such as Suzhou granite and Anji quartz diorite porphyrite) really contain natural silicon-carbon mineral from the mantle. Moissanite has a thin plate shape and sometimes (1014) double crystal. The bottom surface is imperfectly cleaved and has a large hardness (9.5) and a large specific gravity (3.218). The metallic luster and the crystal face often have a halo color, a refractive index Extremely high, birefringence large, green to black, sometimes blue, weak polychrome Ne-cyan, No-olive green or Ne-dark blue, No-light blue, strong dispersion, uniaxial crystal positive. The mineral has three isomorphic variants, namely α