Nephrite is jade of the variety found in china and new zealand, while jadite is the rarer type currently only found in Myanmar. I collect my stones from the banks of the fraser river in british columbia. I have only been as far norrh as boston bar, pictured below.
The jade famous for its beauty and value is found in british columbia, but further north of where i searched for the stone last year. The stones i have are darker and have more variations in colour and are not considered of jewelry quality. I love them, however, and intend to go as much as i can this year. I hope to sell some as aquarium stone and art material.