This was part of the collection I bought, no labels info etc.. It streaks white, hardness of around 5.5 and is not brittle. It does not look like a feldspar to me but all I can think of is Amazonite variety microline. Thx.
The color is right for amazonite. Amazonite gets more bleached color closer to the surface. I mined some in CO. awhile back and it was not very deep. The color is close. Hardness close, streak is right.