Sugilite, a new silicate mineral from Iwagi Islet, Southwest Japan
Sugilite, a new silicate mineral from Iwagi Islet, Southwest Japan
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苏纪石，一种产自日本西南部岩城岛的新型硅酸盐矿物
DOI：
10.2465/minerj.8.110
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
F. Hirowatari
中科院分区：
文献类型：
--
作者：
Nobuhide Murakami;Toshio Kato;Y. Miura;F. Hirowatari
石榴石是爱美县岩城岛霓石正长岩中的一种必需矿物，以体积计占3-8%。它与钠长石、霓石、橄榄石和一种钙-钾-钛硅酸盐(一种仍有待鉴定的矿物)有关。闪锌矿为淡棕黄色，有光泽的玻璃质，条纹白色。对称的六边形。乳沟0001较弱。硬度6-61/2。比重2.802(计算)，2.74Meas。显微镜下为单轴负值，e=1.607，ω=1.610，ω−e=0.003，无色。估算的化学成分为SiO_2 71.38，TiO_2 0.51，Al_2O_3 2.97，Fe_2O_3 12.76，FeO 0.19，Li_2O 3.14，Na_2O 4.37，K_2O 3.76，H_2O(+)0.81，H_2O(−)0.12，总含量为100.01%，与(K，Na)(H_2O)(H_2O)相对应。(Na)2(Fe~(3+)，Na，Ti，Fe~(2+))_2(Li，Al，Fe~(3+))_3(Si_(12)O_(30))，晶胞尺寸a_0=10.007(2)，c_0=14.000(2)A。空间群D26h−P6⁄mcc。X-射线粉末数据与纯钠闪锌矿、千里闪锌矿、黑钠闪锌矿、闪锌矿的X-射线粉晶数据相似。从上述数据可以清楚地看出，闪锌矿具有千里石型结构，在四面体位置上类似于纯钠闪石和闪锌矿，但其特点是六配位含铁量高。以纪念已故的杉木健一教授(1901-1948)命名，他与M.Kutsuna先生一起首次发现了这种矿物。
Sugilite occurs as an essential mineral amounting to 3–8 percent by volume in aegirine syenite from Iwagi Islet, Ehime Prefecture. It is associated with albite, aegirine, pectolite and a Ca-K-Ti silicate (a still to be identified mineral). Sugilite is light brownish yellow, luster vitreous, streak white. Symmetry hexagonal. Cleavage 0001 weak. Hardness 6–61/2. Specific gravity 2.802 (calc.), 2.74 (meas.).Under the microscope, it is uniaxial negative with e=1.607, ω=1.610, ω−e=0.003, and colorless.Estimated chemical composition is SiO2 71.38, TiO2 0.51, A12O3 2.97, Fe2O3 12.76, FeO 0.19, Li2O 3.14, Na2O 4.37, K2O 3.76, H2O(+) 0.81, H2O(−) 0.12, total 100.01%, corresponding ideally to (K, Na)((H2O), Na)2(Fe3+, Na, Ti, Fe2+)2(Li, Al, Fe3+)3(Si12O30) with Z=2.The unit cell dimensions are a0=10.007(2), c0=14.000(2)A. Space group D26h−P6⁄mcc. X-ray powder data resemble those for sodgianite, milarite, osumilite, merrihueite, roedderite and brannockite.It is clear from the above-cited data that sugilite has milarite-type structure and resembles sodgianite and brannockite in containing lithium in tetrahedral site, but it is distinguished by a high content of ferric iron in 6-coordination.The name is given in honour of the late Professor Ken-ichi Sugi (1901-1948), who first found the occurrence of this mineral with Mr. M. Kutsuna.