Note that the Orientation Slice is cut precisely to the (100) before the crystal is rotated and cut at either +.25 degrees and toward the flat, or â.25 degrees and away from the flat (as described in Figure 3).
The era was called the Dark Ages also because we don't have a lot of written sources from that time period, especially from the early part of the dark ages (500 to 800 CE).
Dark Ages Terms. 1  Dark Ages: Another term for the middle ages; the period of time between the fall of Rome and the beginning of the Italian Renaissance. 2  Feudalism: A system of labor that hindered upward social mobility. 3  Bubonic Plague: A plague that devastated Europe in the late 1340s and early 1350s.