Looks like limestone - probably sold in the store as Travertine tile. Bruce

Karen, what are the black specks? I think this is an Intermediate quartzite, but it does have some crystals. It also absorbs up to the waterline, but dries out quickly. I used different edges of the stone to scratch glass, and it passed every time. No etching from lemon juice or vinegar. Bathroom stain test. Left to dry overnight. Clockwise starting with black spot: Mascara, liquid makeup, tinted moisturizer, water (below black), red wine vinegar, mustard, and lemon juice (top right). I left the puddles on pretty thick. I will never have mustard, etc in the bathroom, but I tested them just for giggles. The red wine stain is on the far left and barely visible. The mascara and makeup stains are probably because of the oils. After washed with Dawn. Water absorption test after 15 minutes. The watermark only goes up to the water level. It dried after 15 minutes. I circled tiny black specks that look the same as the veins.

We will be covering the half brick part of our house along with chimneys with the fake veneer stone. Locally we only have El Dorado & Quality Stone but they don't seem to have the colors I need in the style I want. I saw online that Coronado does and they are sending me a few samples. If those don't work, they have a few others that may. Problem is, the 3 masons that I know have not even heard of this brand. If they have the color, I want to make sure that their product is quality and will last a long time. Does anyone on here have experience with the Coronado veneer stone? Know anything about it?

Sorry, I don’t, but remembered this thread a while back with suggestions: https://www.houzz.com/discussions/6151329/help-with-fireplace-stone-white-grey-colors