The mineral name jet is generally employed in western Europe for hard, fossilized coniferous wood capable of being carved and highly polished, particularly that of Early Jurassic (Toarcian) age in NE Yorkshire and geologically related areas. However, the term is derived, by way of the Old French jaiet, from the name Gagae, an ancient Greco-Roman town on the coast of south-western Turkey. Diverse properties were attributed to the mineral by ancient writers such as Pliny the Elder, and it is clear that a variety of substances has been described as jet. In the westernmost Taurus Mountains, rocks of the Gagae area belong to the Antalya Nappes and are succeeded by a Cretaceous ophiolitic unit. Associated dark volcanic rocks are not considered compatible with those for which Pliny's term was originally employed, and interbedded, organic-rich, black layers in the Alakir Cay Unit, one of three units in the Middle Antalya Nappes, may provide a more probable candidate, though this is not certain.
展开▼
机译：矿物名称喷气机在西欧通常用于能够雕刻和高度抛光的坚硬，化石的针叶木材，尤其是东北约克郡和地质相关地区的侏罗纪（Toarcian）时代。但是，该词是通过古法兰西语的“ Gagae”衍生而来的，Gagae是土耳其西南土耳其海岸上的古希腊罗马小镇。古代作家，例如普林尼（Pliny the Elder），将矿物的属性赋予了多种属性，很明显，多种物质被描述为喷射物质。在金牛座山脉的最西端，Gagae地区的岩石属于安塔利亚纳普斯（Antalya Nappes），后接白垩纪的一个滑石质单元。关联的深色火山岩被认为与最初使用普林尼这一术语的火山岩不相容，而在安塔利亚纳皮斯中部三个单元之一的Alakir Cay单元中互层的，富含有机物的黑色层可能提供了一个更可能的候选者，尽管还不确定。
展开▼
