Macadamia shells

Fun fact! While the kernel and oil of macadamia nuts are the main products, macadamia shells have a number of uses as well, such as mulch, fuel (think charcoal), as a planting medium for anthurium cultures, for plastic manufacture, as well as a substitute for sand in sandblasting.

While the kernel and oil of macadamia nuts are the main products, macadamia shells have a number of uses as well, such as mulch, fuel (think charcoal), as a planting medium for anthurium cultures, for plastic manufacture, as well as a substitute for sand in sandblasting.

Source: https://www.agmrc.org/commodities-products/nuts/macadamia-nuts