无底价 - 克拉 60.0 顶级色彩 埃塞俄比亚欧泊 - 粗糙系列- 12 g

极佳的一批天然贵族埃塞俄比亚粗糙欧泊，因质量与变彩效果而精选。
尺寸（按长度计）为7.0至12.0毫米。
所有图片均使用高分辨率相机拍摄，材料完全干燥并置于不同背景上，以尽可能真实地呈现欧泊的外观。
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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.
欧泊是一种水合的二氧化硅形式，水分含量在3%至21%之间。确实，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.
欧泊通常在相对较低的温度下沉积，可能出现在几乎所有类型岩石的裂缝中，最常见于赭铁矿、砂岩、流纹岩、泥灰岩和玄武岩。只有宝石级欧泊才呈现出内部颜色的多变互作。
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，宝石欧泊由直径约150至300纳米的二氧化硅球组成，排列在六方紧密堆积或立方紧密堆积的晶格中。这些有序的硅球通过使光线在欧泊的微观结构中发生干涉和衍射来产生内部颜色。