I drop my TB in this earthcache that every cacher can discovered it.
汉白玉特指北京房山出产的白色大理石，质地坚硬洁白。主要成分是碳酸钙，，化学式是CaCO3，其他成分还有MgCO3和SiO2等。
颜色洁白的细粒大理岩，质地坚硬，是上等的建筑和雕刻材料。基本上它并不溶于水。它可存在于以下形态：霰石、方解石、白垩、石灰岩等。
岩石：汉白玉
岩石类型：大理石（变质岩）
粒度： 0.5至2毫米
质地：固体
成分：碳酸钙
颜色：乳白色，浅灰色，淡黄
形态：霰石，方解石
1）纯质碳酸盐大理岩，主要是方解石、白云石。
2）硅质碳酸盐大理岩，主要是滑石、石英、透辉石、粒硅钙石等。
3）泥质碳酸盐大理岩，主要是蛇纹石、绿泥石、方柱石、正长石等。
华表是中国特有的古代文化遗产之一，最早是用来供人写谏言的，后来逐渐发展成为皇权的象征，一般都放置在宫殿外或皇陵的道路两侧。华表一般由底座、蟠龙柱、承露盘和其上的蹲兽组成，通常由汉白玉雕刻，底座大多是雕刻由龙形的方形莲花座或须弥座；蟠龙柱上雕刻一只蟠龙盘并有云纹装饰，上端横插一个云板；石柱顶端有一个承露盘，与底座对应，形成天圆地方，上面有一蹲兽。一般认为华表的雕刻是皇权的象征，代表皇帝的权利至高无上，无可撼动。
天安门城楼内外各有一对华表，已经有500多年的历史，它们以故宫为轴线，左右对称。这些华表用料考究，雕刻精美，云纹流水，蟠龙绕柱，仔细观察，你可以看到云板是不对称的。这对华表顶端各立着一只蹲兽，名字叫犼，被称为望君归（不可留恋外面的花花世界），而里面那对华表顶端的蹲兽被称为望君出（须外出体察民情）。
任务：
你可以先log，然后将以下问题的答案发到我的邮箱里，以确保您的log是真实有效的。如果在两个星期内没有收到你的邮件，我将会删除您的log。
1) 雕刻华表的石料是什么类型的汉白玉（纯质、硅质、泥质大理石）？
2) 从你的观察来看，雕刻华表的汉白玉是光滑的还是粗糙的？
3) 你可以在雕刻华表的汉白玉上看到什么颜色的颗粒？
4) 如果汉白玉的密度是2600Kg/m3，你能估算一下华表的重量吗？
5) 与漂亮的华表合个影（这个不是必须的）。
请不要将问题答案写在您的log里。
提示：由于安保原因，请带好自己的身份证或护照，并做好排队的思想准备。
Alabaster is a kind of marble. By Fangshan of Beijing, the Alabaster have so hard white. The main ingredient is calcium carbonate, the chemical formula is CaCO3, the other components are MgCO3 and SiO2, etc.
The fine Alabaster with hard that is an excellent building and engraving material. Basically it does not dissolve in water. It can be found in the following forms: aragonite, calcite, chalk, limestone, etc..
Rock: alabaster
Rock type: marble (metamorphic rock)
Granularity: 0.5 to 2 mm
Texture: solid
Ingredients: calcium carbonate
Color: milk white, light gray, pale yellow
Form: aragonite, calcite
1)pure carbonate marble: mainly calcite and dolomite.
2)siliceous carbonate marble: mainly talcum, quartz, diopside, granular silicalite and etc.
3)argillaceous carbonate marble,: mainly serpentine, chlorite, orthopite and etc.
Huabiao (simplified Chinese: 华表) is a type of ceremonial columns used in traditional Chinese architecture. Huabiao are traditionally erected in front of palaces and tombs. The prominence of their placement have made them one of the emblems of traditional Chinese culture. When placed outside palaces, they can also be called bangmu (simplified Chinese: 谤木"commentary board"). When placed outside a tomb, they can also be called shendaozhu (Chinese: 神道柱; "spirit way columns").
Extant Huabiao are typically made from white marble. A Huabiao is typically made up of four components. At the bottom is a square base, called a sumeru base, which is decorated with bas-relief depictions of dragons, lotuses, and other auspicious symbols. Above is a column, decorated with a coiled dragon and auspicious clouds. Near the top, the column is crossed by a horizontal stone board in the shape of a cloud (called the "cloud board"). The column is topped by a round cap, called the chenglupan (承露盤) "dew-collecting plate" (see fangzhu). At the top of the cap sits a mythical creature called the denglong , one of the "nine children of the dragon", which is said to have the habit of watching the sky. Its role atop the huabiao is said to be to communicate the mood of the people to the Heavens above.
The Tiananmen gate inside and outside have a Huabiao that has 500 years of history, symmetrical with the Imperial Palace as the axis.. It can be seen that the material is exquisite, the carving is exquisite, the cloud pattern is flowing, and the Panlong is around the column. After careful observation, you can see that the cloud board is asymmetrical. There is a squatting beast at the top.
Task:
You can immediately log and then send the answers of the following questions to my email or message to make sure your log is valid. If I did not receive the mail or message within two weeks, I will delete your log。
1) What type of Huabiao (pure, siliceous and argillaceous marble) is the alabaster?
2) For your watch, is the alabaster grain of the Huabiao smooth or rough?
3) What colour grains can you see in the alabaster of the Huabiao?
4) If the alabaster density is 2600Kg/m3, can you estimate the weight of the Huabiao？
5) Make a photo with Huabiao. (optional).
Please do not write the answers in your log.
Hint: Because security reasons, please bring your ID card or passport and prepare for queuing.