Vintage Sterling Silver Taxco Mexico Blue Stone Southwestern Sllider Penadnt

Vintage sterling silver slider pendant in a southwestern design set with a blue and white stone. I do not know what type of stone this is. Bale is large enough to fit most chains or cords. Pendant weighs a hefty 20 grams. Pendant measures 1 and 13/16ths of an inch length and 1 and 1/4th of an inch across widest point. Stamped Mexico, T(blurred number)-41, 925, and acid tests positive for sterling silver. I