摘要
铬钙钒榴石发现于江苏省句容县铜山铜钼矿外接触带的大理岩中。该矿物属等轴晶系,空间群为O_h^(10)-Ia3d。晶胞参数a_0=11.9470,Z=8;化学成分中SiO_2=34.99％,Al_2O_3=7.61％,CaO=32.95％,V_2O_5=13.41％,Cr_2O_3=10.13％,其化学式为:(Ca_(2.938)Na_(0.003)_(2.941)(V_(0.737)Cr_(0.666)Fe_(0.006)Al_(0.531)_(2.00)(Si_(2.938)Al_(0.156)_(3.094)O_(12)。折光率n=1.799(±0.0015)。计算比重为3.72。VHN_(100)=1168.7kg/mm^2,摩氏硬度7.1。它是一种既有钒,又有铬的同生沉积和岩浆侵入接触交代变质矿物。它的发现为石榴石族增添了新成员,并为铬钙钒榴石成因提供了新的产状资料,同时对铬钒元素的地球化学研究也具有重要意义。
Chromian goldmanite is discovered in marble along exocontact zone of the Tongshan copper-molybdenum deposit, Jurong county, Jiangsu province. It is of isometric system, with space group O_h^(10)-Ia3d, unit cell parameters a_0=11.9470, Z=8; its chemical composition is SiO_2=34.99％, Al_2O_3=7.61％, CaO=32.95％, V_2O_5=13.41％, Cr_2O_3=10.13％, giving a chemical composition of (Ca_(2.938)Na_(0.003))_(2.941) (Cr_(0.666)V_(0.737)Fe_(0.006)Al_(0.591))_(2.00) (Si_(2.938)Al_(0.156))-(3.094)O_(12) Refractive index n=1.799 (±0.0015). Calculated specific gravity 3.75, VHN_(100)=1168.7kg/mm^2, Moss hardness 7.1. It is a mineral formed as a result of syngenetic deposition and intrusive contact metamorphism and containing vanadium, chromium and aluminium.The discovery of this mineral has added a new member to the garnet group and also provided new data of occurrence for chromian-vanadic minerals In addition, it is of great significance to the study of chromium-vanadium geochemistry,
出处
《岩石矿物学杂志》
CAS
CSCD
1989年第3期260-267,共8页
Acta Petrologica et Mineralogica
关键词
铬钙钒榴石
石榴石族
矿物
chromian goldmanite
minerals of garnet group
Jiangsu province
