quartz is found in the cave (i recommend bringing some food cuz you may take a lot of time to find quartz or if ur lucky enough it'll be fast), that is near romeo, ball joints are also near romeo, burried in grain pile (it's recommended to bring metal detector), ankle or knee joints can be found inside tr3 (in bookshelf where's the keyboards etc.) and in tr1 (look inside a bucket). Feel free to ask me if smth is confusing to you.