BLUE (MEDIUM) LAPIS WITH PYRITE
Although many may rate this one as a "Hard", I feel the hype of its difficulty is overrated. After turning over 75 different colors of the material I would rate this one a "Moderate." Try one yourself and let me know what you think. Sharp tools are still a must.
The medium is very similar in color to the dark. It's just a shade lighter than the dark. The newer stock doesn't not have a large amount of pyrite matrix in it.