菱面体

Their crystal structure sets them apart: calcite forms hexagons and aragonite forms rhombohedrons.

它们的结晶构造使它们分离：方解石型六角形和文石的菱面体。

The basic form of this crystal is a rhomb .

此类晶体的基本形状为一菱面体。

For the particle of icosahedral shape and 2 for that of tetrahedral figure.

观察到的是样品内颗粒的菱面体单胞排列的[001]投影图。

Two opposite corners of this rhomb contain three obtuse angles of 101°55'.

菱面体的两个对顶包含着三个101°55'的钝角。

Based on the observation of atomic force microscopy, the etching morphology of faces and sections with different crystallographic significance on α-quartz has been studied. The etching morphology on the natural crystal faces hexagonal prism faces (1010 and 01(average10, rhombohedron positive form face 10(average11, rhombohedron negative form face 01(average11 and the sections between any of the two crystal faces has been observed. It is shown that the etching pit on the same simple form has the same shape, while the orientation of the etching pits can be different. Different simple forms have different shapes of etching pits and the shapes of etching pits on positive form and negative form of the same simple form are also different.

通过对α-石英自然晶面六方柱面10(平均值10和01(平均值10、菱面体正形面10(平均值11与菱面体负形面01(平均值11、以及介于上述自然晶面之间的切面进行腐蚀形貌的观察研究发现，石英晶体同种单形的晶面腐蚀坑形态相同，但方位可以有变化，不同单形的晶面腐蚀坑形态不同；同一单形的正形与负形腐蚀坑形状不同；蚀坑形态能够反映晶体的对称性。

On the rhombohedron face {1011}, Dauphine twinning showed different shapes of etching pits between individuals, because rhombohedron positive form {1011} and negative form {0111} appeared on both sides of twin partition line, while Brazil twinning showed symmetry plane between the irregular triangle etching pits of individuals. On the trigonal prism section 11(average20, Dauphine twinning showed different shapes of etching pits between individuals, because trigonal prism positive form {1120} and negative form {2110} appeared on both sides of twin partition line, while Brazil twinning should show symmetry plane between the ellipse or quadrilateral etching pits of individuals, which was not observed.

菱面体{1010}面上存在道芬双晶处，道芬双晶双晶缝合线两端分别是菱面体正形、菱面体负形出露处，导致蚀坑形状不同；菱面体{1011}面上存在巴西双晶处，不规则三角形蚀坑形态的方位关系为对称面关系；三方柱切面{1120}面上存在道芬双晶处，道芬双晶双晶缝合线两端分别是三方柱正形、三方柱负形出露处，导致蚀坑形状不同；三方柱切面{1120}面上存在巴西双晶处，椭圆形或四边形蚀坑方位应为对称面关系，但实验中未见到。

Crystal habit: prismatic crystals elongated on c, often flattened on {100} with deep vertical striations, also can be acicular or in cleavable masses.

晶体结构特征：单斜晶系，柱状晶体，扁平柱状晶体，常有熔蚀现象，并有明显的三角形表面印痕。菱面体样块体结构，常有较深垂直条纹，有时呈针状或者集合状

In contrast to ordinary liquid and amorphous alloys, the number of 1551 bonds related to the icosahedral structure becomes very smaller with the decrease of temperature,but the numbers of 1311,1301,1201 bonds related to the rhombohedral structure are increased remarkably.

结果表明，与通常液态及非晶态金属相反，随着温度降低，与二十面体相关的1551键型数越来越少，而与菱面体相关的1311，1301和1201键型数目显著增加，最后形成以菱面体结构单元为主的非晶态结构。

77Cm〓 are observed and predicted to be splitting of vibration mode of inter-icosahedral B-B bonds, which are unrelative to the atmospheric conditions.

IR结果发现所有样品在2850.27cm〓和2917.77cm〓处均有吸收峰，这是由于B〓O中的B〓二十面体位于菱面体单胞内，对称性降低，发生简并分裂所致。

Smithson's name was also left for The Smithsonian Institution, since his huge heritage contiributed in establishing the Institution.

直到1807年，英国矿物学家 James Smithson （1765-1829）才明确提出这种新矿物，因此1835年以他的名字命名了菱锌矿，而且还成立了 James Smithson 协会。中文名菱锌矿是因为其主要成分是锌还有呈菱面体结晶的缘故。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。