Although the term jasper is now restricted to opaque quartz, the ancient "iaspis" was a stone of considerable translucency including nephrite. The jasper of antiquity was in many cases distinctly green, for it is often compared to emerald and other green objects. Jasper is referred to in the "Nibelungenlied" as being clear and green. The jasper of the ancients probably included stones which would now be classed as chalcedony, and the emerald-like jasper may have been akin to the modern chrysoprase. The Hebrew word may have designated a green jasper. Flinders Petrie suggested that the "odem", the first stone on the High Priest's breastplate, was a red jasper, whilst "tarshish", the tenth stone, may have been a yellow jasper.