Your title about the "Indian rock" brought back a hilarious memory for me that I want to share. Several years ago I was doing some construction site plumbing at a New Winchester ammo plant being built nearby. We had a tornado to hit the job site one night after we had all gone home. After a three day off-time, (they had to do the insurance thing because of the massive damage they had sustained on the construction site). We were allowed to return back to work, laying underground piping in a dug trench. One of the guys ran up excited and says "Look at this Indian Rock I just found"! As he held it out for all to see, but wouldn't let go of his prize. He stood there cleaning off all the dirt that he could with his hands. He wiped off enough mud to see that it was a round, blue sparkling something....His work partner took one look and told him to throw it away. Because his "Indian Rock" was a porta-john urinal deodorizer!