Well here goes...I picked up a great piece of Utah Lace Rock, which was collected at Topaz Mountain, UT. The rock weighed in at 2 lbs 14 oz.
Here's two pics of the full rock:
Here is a close up...Very close. This is about a square inch of the piece.
to begin with GH was 60 ppm, KH was just under 50 ppm and the TDS showed as 179:
pH was at 6.2 (which I am wondering if it is correct, given this was not CO2 injected, and the KH levels).
Here is the piece in the 5g bucket filled half way:
Some things I am worried about is it has lichen on it. I would have spent more time removing it if I were to put it in the tank. It also feels very delicate to the touch. I could feel it crumbling in my hands. I really like the look of it, and some of the larger pieces looked great! I am excited to see how the water parameters change over the next two weeks.
Also as I am keeping the tank at a constant pH of 6.3, I would assume the test will not show what would actually happen. I think the CaCO3 would dissolve even more quickly in the actual tank.
I am going to be away from 12/1-12/12 so I won't be tempted to mess around with it. Let me know if anyone wants a souvenir from Egypt.