The brick itself looks a little bit like obsidian and can be broken easily into glassy shards. To brew the tea I dissolved a few tiny shards into about 8 ounce of boiling water.
That's all the tea I used:
The resulting tea has a nice color and a curious earthy, mushroom-like, shu puer (熟普洱) aroma. This heady redolence is both alluring and intimidating.