Olivine has the formulae (Mg,Fe)2SiO4 and a relative hardness of 7. It's name is derived from the characteristic olive green colour. A common rock forming mineral. A clear green variety is called peridot and has some uses as a gem.
Hear it on YouTube. Here's a piece that many people know, and rightfully so! This famous classical piece from the romantic period is one of those pieces that has the ability to make anyone feel happy. Composed in the 1920s, for a ballet, the piece was an instant success.
1 The Romantic period was also the period of the industrial revolution, which created a new and very wealthy class of businessmen and entrepreneurs that was much larger than the ancient aristocracies of Europe. This new class tended to see themselves as struggling against aristocratic codes of behaviorâand tax codes.