Composting Fruit Stones (Pits)
One of the problems with composting soft fruit such as mango, nectarine and avocado is that the stones do not breakdown the first time that they are composted. Soaking the stones in boiling water will speed decomposition but they may still appear
in the finished compost. In home composting, where relatively few stones are being composted at a time, hitting the soaked stones with a hammer is a very effective means of ensuring that the the maximum surface area will be exposed to the composting microbes
and that there are no lumps in the finished compost. The photos show the stones before and after the use of a hammer as a precomposting treatment.
More information on composting fruit at http://www.carryoncomposting.com/142941490