Does your tree have long thorns or short thorns?
Long thorns
Tree has long spines or thorns; leaves are long and narrow; leaf is silvery colored and scurfy or scalely
OR
Short thorns
Thorns are straight and 1/2 inch long; leaves are 3 to 5 inches long with a long pointed tip?; leaves are 3 to 5 inches long with a long pointed tip