Jadarite, LiNaSiB3O7(OH), a new mineral species from the Jadar Basin, Serbia
Jadarite, LiNaSiB3O7(OH), a new mineral species from the Jadar Basin, Serbia
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Jadarite，LiNaSiB3O7(OH)，产自塞尔维亚贾达尔盆地的一种新矿物
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Y. Lepage
中科院分区：
文献类型：
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作者：
C. Stanley;G. C. Jones;M. Rumsey;Christopher Blake;A. C. Roberts;J. Stirling;G. Carpenter;P. Whitfield;J. Grice;Y. Lepage
Jadarite，理想的LiNaSiB3O7（OH），是一种产于塞尔维亚Jadar盆地的新矿物。它呈块状白色聚集体，厚数米，相对无夹杂物和共生体;然而，单个半面体（板状，细长）至他面体晶体的尺寸很少超过5 - 10 μ m。它与方解石、白云石、钾长石、金红石、钠长石、钛铁矿、黄铁矿和细粒白云母共生。还鉴定出了方沸石、方沸石和石英。硬玉是半透明的（块状不透明），具有多孔光泽（块状），具有白色条纹，易碎，呈片状，断裂不均匀至贝壳状。VHN 200为390（范围343 - 426）kg/mm2。莫氏硬度为4 - 5。它在短波和长波紫外辐射下都显示出微弱的粉红色-橙色荧光。给出了红外吸收光谱，并在3490和3418 cm − 1处显示出强的尖峰，这表明水仅以（OH）形式存在。在1409和1335 cm − 1处的峰表明存在BO3基团，在900和1180 cm − 1之间可能存在BO4。在透射光下，某些微晶中的硬玉石片晶和晶粒显示出孪晶，在λ 590 nm处，n α = 1.536（± 0.001），n γ = 1.563（± 0.001）。它是非多色性的，双轴的，并且不显示平行消光。在平面偏振反射光下，矿物呈暗灰色，双反射率较弱，非多色性，内反射丰富，为白色。结合CHN分析仪的湿化学分析给出以下聚集体组成：Li2O 7.3，Na2O 15.0，SiO2 26.4，B2O3 47.2，H2O 4.3，总计100.2重量%。基于每个化学式单元（apfu）3个B原子，经验式为：Li1.08Na1.07Si0.97B3O6.99（OH）1.06。硬玉岩是单斜的（P 21/n），a 6.818（2），B 13.794（2），c 6.756（2）A，β 111.10（2）° V 592.8（2）A3（Z = 4），或者（P21/c），a = 6.756（3），B = 13.794（2），c = 7.680（3）A，β = 124.07（3）°，V = 592.9（4）A3，Z = 4。测量的密度（Berman Balance）为2.45 g/cm3;计算的密度为2.46 g/cm3（基于经验公式和从粉末数据中提炼的晶胞参数）。六条最强的X射线粉末衍射线[d in A（I）（hkl）]是：4.666（62）（120，021）、3.180（82）（200）、3.152（74）（002）、3.027（40）（221）、2.946（100）（131）、2.241（74）（3 11，151），矿物名称是在塞尔维亚的地方，它是在贾达尔盆地的矿物勘探期间发现的。
Jadarite, ideally LiNaSiB3O7(OH), is a new mineral species from the Jadar Basin, Serbia. It occurs as massive white aggregates, several metres thick, and is relatively free from inclusions and intergrowths; however, individual subhedral (tabular, elongate) to anhedral crystals rarely exceed 5–10 μm in size. It is associated with calcite, dolomite, K-feldspar, rutile, albite, ilmenite, pyrite, and fine-grained muscovite. Searlesite, analcime, chlorite, and quartz have also been identified. Jadarite is translucent (opaque in masses) with a porcellanous lustre (masses), possesses a white streak, is brittle with a platy habit and has an uneven to conchoidal fracture. VHN200 is 390 (range 343–426) kg/mm2. Mohs’ hardness is 4–5. It shows weak pink-orange fluorescence under both short- and long-wave ultraviolet radiation. An infra-red adsorption spectrum is given and shows strong, sharp peaks at 3490 and 3418 cm−1 which indicates that water is present as (OH) only. Peaks at 1409 and 1335 cm−1 indicate the presence of BO3 groups, and between 900 and 1180 cm−1 the probable presence of BO4. In transmitted light, plates and grains of jadarite show twinning in some crystallites and for λ 590 nm n α = 1.536(± 0.001) and n γ = 1.563(± 0.001). It is non-pleochroic, biaxial, and does not show parallel extinction. In plane-polarized reflected light, the mineral is dark grey with weak bireflectance, it is non-pleochroic and has abundant white internal reflections. Wet chemical analysis combined with CHN analyzer gave the following aggregate composition: Li2O 7.3, Na2O 15.0, SiO2 26.4, B2O3 47.2, H2O 4.3, total 100.2 wt.%. The empirical formula, based on 3B atoms per formula unit ( apfu ), is: Li1.08Na1.07Si0.97B3O6.99(OH)1.06. Jadarite is monoclinic ( P 21/ n ) with a 6.818(2), b 13.794(2), c 6.756(2) A, β 111.10(2)° V 592.8(2) A3 ( Z = 4), alternatively ( P 21/ c ) with a 6.756(3), b 13.794(2), c 7.680(3) A, β 124.07(3) °, V 592.9(4) A3 and Z = 4. The measured density (Berman Balance) is 2.45 g/cm3; calculated density is 2.46 g/cm3 (on the basis of the empirical formula and unit-cell parameters refined from powder data). The six strongest X-ray powder-diffraction lines [ d in A( I )( hkl )] are: 4.666 (62) (120, 021), 3.180 (82) (200), 3.152 (74) (002), 3.027 (40) (221), 2.946 (100) (131), 2.241 (74) (3 11,151), The mineral name is for the locality in Serbia where it was discovered during mineral exploration of the Jadar Basin.