8Where can we get this magic wand and crystal ball?我们到哪里获得这种魔棒和水晶玻璃球？
A elementary notion in crystal buildings may be the device mobile. It is the smallest device of volume that permits equivalent cells for being organized collectively to occupy all accessible space. The geometrical basis of all crystals will be the lattice. A lattice may be viewed as an everyday and infinite arrangement of points or atoms, exactly where Each and every stage or atom has An analogous bordering ecosystem.
A primary thought in crystal structures will be the unit cell. It's the smallest device of volume that permits identical cells for being stacked collectively to fill all House. By repeating the sample from the unit cell repeatedly in all Instructions, the whole crystal lattice could be made. A dice is The best illustration of a unit mobile. Two other examples are shown in Determine 1. The initial will be the unit mobile for the confront-centred cubic lattice, and the next is for any physique-centred cubic lattice. These constructions are stated in the following paragraphs.
看原料：选料精良的水晶制品，应看不到胶口及棉絮；质地纯净、光润、晶莹为好。
条痕颜色：无色。矿物粉末的颜色叫条痕。它可以消除假色，减弱他色，保留自色，是比矿物的颜色更为可靠的鉴定特征之一。
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时尚的收藏爱好者喜欢收藏天然水晶，却常常因为在市场上面对大量的合成水晶看走了眼。市面上的水晶：
如果水晶内部杂质中有传说中人物的造型，如佛、星座、生肖等价值可能要高于同等颜色和净度的水晶。
水晶是有成色等级之分，影响水晶价位的因素很多，不像钻石以4C就可以判定，所以大家要多听多看多比较才能真正辨别出来。一般的标准是水晶石越大越好，越透越好，颜色越娇嫩越好，形状越典型越好。不过最重要还是自己喜欢，而选购时辨识真伪的方法大致有下列几种：
[ C/U ] clear glass of top of the range, commonly with its surface area Slice into patterns that reflect mild
Browse cryptosporidiosis cryptosporidium cryptozoologist cryptozoology crystal crystal ball Crystal crystal crystal clear idiom crystal lattice BETA copyright #randomImageQuizHook.filename #randomImageQuizHook.isQuiz Test your vocabulary with our exciting impression quizzes
Orthorhombic: These are typically rhombic prisms and dipyramids that resemble tetragons but without having sq. cross-sections.
⑨、喷砂：立体感弱，较平整，无凹凸感，机器雕刻文字、图形等后进行效果处理。成本低制作快。
Tetragonal �?Characterized by 3 mutually perpendicular axes, two of which are equal in length, whilst the third is more time or shorter and perpendicular to another two.