The Altar Stone is a central megalith at Stonehenge in England, dating to Stonehenge phase 3i, around 2600 BC. It is made of a purplish-green micaceous sandstone and is thought to have originated from outcrops of the Senni formation of the Old Red Sandstone in Wales, though this is currently in debate.
网络释义
1、现已非必要
altar stone：圣石：祭台正中所镶的石块，如书本大小，其中藏有殉教者的骨骸；现已非必要。 alter Christus（L.）：基督第二；基督替身：多指圣职人士，近亦用以指一般教友。