黄丹 (矿物)

{{Infobox mineral
| name = 黄丹
| boxwidth =
| boxbgcolor =
| image = Massicot-177335.jpg
| imagesize = 260px
| alt =
| caption = 来自内华达州克拉克县古斯普林斯区基督山矿的黄丹(尺寸:5.0 x 4.0 x 4.0 cm)
| category = 氧化物矿物
| formula = PbO
| IMAsymbol = Msi
| molweight =
| strunz = 4.AC.25
| dana =
| system = 斜方
| class = 双锥体 (mmm)
H-M记号:(2/m 2/m 2/m)
| symmetry = Pbcm
| unit cell = a = 5.4903 Å, b = 5.892 Å,
c = 4.752 Å; Z = 4
| color = 黄色可能带有红色调
| colour =
| habit = 大规模的鳞片状结壳
| twinning =
| cleavage = {100}明显,{010}明显
| fracture =
| tenacity =
| mohs = 2
| luster = 泥土光泽到油脂光泽
| streak = 黄色
| diaphaneity = 半透明
| gravity = 9.642(计算)
| density =
| polish =
| opticalprop = 双轴 (+)
| refractive = nα = 2.510 nβ = 2.610 nγ = 2.710
| birefringence = δ = 0.200
| pleochroism = Y = 浅硫黄色; Z = 深黄色
| 2V = 测量:90°, 计算:86°
| dispersion = 强
| extinction =
| length fast/slow =
| fluorescence =
| absorption =
| melt =
| fusibility =
| diagnostic =
| solubility =
| impurities =
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| prop1 =
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| references =
}}

黄丹()是具有正交晶系结构的含铅氧化物矿物。一氧化铅有两种不同的晶形。四方晶系的被称为密陀僧。通过控制加热和冷却,PbO可以从黄丹变为密陀僧,反之亦然。在室温下,黄丹形成柔软的(莫氏硬度为2)黄色至红黄色,土状或鳞片状的物质,比重为9.64。黄丹可以作为一种天然矿物被发现,尽管数量很少。

它可能作为其他含铅矿物的氧化产物,例如方铅矿、车轮矿、硫锑铅矿等。当在自然环境中发现黄丹时,可能一起发现的部分其他矿物如白铅矿、密陀僧、铅丹、钼铅矿、锑华和褐铁矿等。

参考资料

  • Palache, C., H. Berman, and C. Frondel (1944) Dana’s system of mineralogy, (7th edition), v. I, 516–517

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