Яшма с выемкой Jasper with notch 碧玉缺口 ノッチ付きジャスパー 노치가있는 재스퍼 Jasper mit Kerbe Jaspe avec encoche

Яшма с выемкой Jasper with notch 碧玉缺口 ノッチ付きジャスパー 노치가있는 재스퍼 Jasper mit Kerbe Jaspe avec encoche Jasper con muesca Jasper com entalhe पायदान के साथ जैस्पर يشب مع الشق உச்சநிலை கொண்ட ஜாஸ்பர் แจสเปอร์ที่มีรอยบาก Τζάσπερ με εγκοπή Jasper dengan takik Jasper is an opaque rock of virtually any color stemming from the mineral content of the original sediments or ash. Patterns arise during the consolidation process forming flow and depositional patterns in the original silica rich sediment or volcanic ash. Hydrothermal circulation is generally thought to be required in the formation of jasper.[citation needed] Jasper can be modified by the diffusion of minerals along discontinuities providing the appearance of vegetative growth, i.e., dendritic. The original materials are often fractured and/or distorted, after deposition, into diverse patterns, which are later filled in with other colorful minerals. Weathering, with time, will create intensely colored superficial rinds. The classification and naming of jasper varieties presents a attributed to various well-defined materials includes the geographic locality where it is found, sometimes quite restricted such as “Bruneau“ (a canyon) and “Lahontan“ (a lake), rivers and even individual mountains; many are fanciful, such as “forest fire“ or “rainbow“, while others are descriptive, such as “autumn“ or “porcelain“. A few are designated by the place of origin such as a brown Egyptian or red African.