Hey Wailele, Sorry about this late response.
That's a real pretty chunck of a green rock! It looks like good material.
I couldn't tell you if it was jade or nephrite. I think that's a hard thing to determine. Might come down to chemistry......and it's good to remember that jadeite and nephrite are both jade.
But, I think a hardness test would tell a lot to whether it is jade or nephrite, serpentine, or a chrysoprase. A sharp piece or point of quartz crystal will scratch serpentine, barely scratch jade/nephrite, and won't noticeably scratch chrysoprase. If you're still wondering if it's jade or not.
That's definitely something to keep your eye out for!
Thanks for the pictures.