Macadamia nuts have a very hard seed coat enclosed in a green husk that splits open as the nut matures. It holds a creamy white kernel containing up to 80% oil, which accounts for their rich, buttery flavor.
Macadamia Nuts - A Hard Nut to Crack
Crack-a-Mac™ - Handheld Macadamia Nut Cracker
Macadamia Nuts Processing Industry in South Africa
Macadamia Nuts on the Big Island: Visiting the Orchards
How to Crack Macadamia Nuts: 10 Steps (with Pictures) - wikiHow
Cracking a tough nut for macadamia growers - UQ News - The University of Queensland, Australia
250 KG Macadamia Nuts Cracking Shelling Machine
What is the most difficult nut to crack? - Quora
Maori macadamia industry tough nut to crack
How to Crack Macadamia Nuts: 10 Steps (with Pictures) - wikiHow