Stressbusting Stone From a South American River

This page is the CodyCross answer for the clue below from The 1950s, Group 1807, Puzzle 2 (Beat Generation).

Question is: Stressbusting Stone From a South American River

and the answer is: AMAZONITE

Word Meaning:

AMAZONITE — A gem variety of microcline feldspar, varying from bright verdigris green to a bluish green.

Definitions from Wiktionary.