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).
The arrival of the Dark Ages in Europe followed the fall of the Greek and Roman empires in approximately 500 A.D. Several theorists propose that the term Dark Ages described the difference in intellect and cultural advancement between European citizens and people living in ancient Greece and Rome.