Based on the look of the picture and the description, this sounds exactly like Gyokuro Blend Sencha by Yamamotoyama. The leaves have big pieces in them, that look like Kukicha/Karigane (the twigs and bottom parts of the leaf), but also a lot of very very small leaves, which looks like Fukamushi (deep steamed) which breaks up the leaves further into smaller pieces like that. I’m curious now to see if it is the same….