How much do your crystals weigh? If they are something like water extracted hash, I have a friend who makes canna capsules at 5 to a gram after decarbing the hash. That should give you some idea of dosage. For QWISO extracted or BHO resin, I find about 25 hits per gram, decarbed, is a nice dosage, but this has almost no plant matter. The 'crystals', if they are trichromes, have a coating of plant material, and there is probably some dust of plant parts too from grinding.