无底价 - 9.0 克拉 自然埃塞俄比亚黑欧泊 - 椭圆形 弧面形 - 高度: 7 mm - 闊度: 5 mm- 1.9 g

Beautiful Parcel of Natural Black Ethiopian Cabochon Opals from Wello, Ethiopia.
优美的一批天然黑色埃塞俄比亚凸状切割欧泊，来自埃塞俄比亚的韦洛地区。
Clarity: from transparent to opaque;
色泽/透明度：从透明到不透明；
Dimensions: 7 X 5 X 3 mm;
尺寸：7 x 5 x 3 毫米；
Treatment: smoked.
处理：烟熏处理。
Pictures taken with high resolution camera on different backgrounds in order to depict the opals as realistically as possible.
为尽量真实地呈现欧泊，采用高分辨率相机在不同背景下拍摄。
Worldwide shipping with registered mail and tracking number.
全球发货，挂号信并附追踪号码。

An opal is a hydrated form of silica with a water content ranging from 3 to 21%. Indeed, it is this permeability to water that makes it a hydrophile.
欧泊是一种水合二氧化硅，水分含量介于3%到21%之间。正是这种对水的渗透性使其成为亲水性矿物。
Opals are deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Only precious opals show a variable interplay of internal colors.
欧泊在相对较低的温度下形成，几乎能出现在各种岩石的裂缝中，最常见于褐铁矿、砂岩、流纹岩、灰岩和玄武岩。只有珍贵欧泊才呈现出内部颜色的多变光彩。
At microscopic scales, precious opal is composed of silica spheres some 150 to 300 nm in diameter in a hexagonal or cubic close-packed lattice. These ordered silica spheres produce the internal colors by causing the interference and diffraction of light passing through the microstructure of the opal.
在显微尺度上，珍贵欧泊由直径约150至300纳米的二氧化硅球组成，球体排列在六方最密堆积或立方紧密堆积晶格中。这些有序的二氧化硅球通过干涉和衍射穿过欧泊微观结构的光线来产生内部色彩。