Go with mineral wool. 

Our main line of business is helping investors invest in syndications like DSTs and or alternative investments and mineral rights.

My mind always things in terms of geology and is there oil or mineral wealth and then I go back to tree farming and other things i can grow.

I am a gold miner to and they say that "gold is where you find it."

This guy deeded mineral/gas rights to a trust via book/page 15781/506.

When moisture is evaporating up though the slab and ultimately through your grout joints you'll get water soluble minerals that are left behind on the surface of the grout, its called "efflorescence", and yes, its very hard to clean.The only ways to avoid this is to check the subfloor with a moisture meter to be sure it's completely dry or installing a vapor barrier over the slab prior to tile. 

Something that came up for me recently was mineral rights.

I use disinfectant wipes for final touchups.My favorite kitchen degreaser is Awesome, for a buck from the Dollar Tree store - I've tested it against the more expensive ones and it beats them hands down.For getting stubborn mineral deposits and nasty rings off porcelain toilets and tubs, use plumber's open mesh cloth.

Some well water has minerals that cause electrolysis that damage copper or galvanized plumbing.

I have a house that had such low water pressure that the kitchen sink wouldn't even run when the washing machine was filling.It turned out to be just the first run of copper pipe coming in, which was so full of mineral deposits that the open path through it was like a spaghetti noodle. 50 feet of that, and not much comes out the other end!