We use a variety of irregular and round rock for building retaining walls, raised beds, platforms for cobb ovens.  Using Rocks/boulders in landscape projects.   How much does a “1 man” rock weigh? 2 man rock? 3 man  Here are average sizes
Rock Weight Size
Half Man 10 – 50 pounds 8 – 12″
One Man 20 – 240 pounds 12 – 18″
Two Man 150 – 750 pounds 18 – 30″
Three Man 750 – 3500 pounds 24 – 36″03