I was thinking it's a gaint mold with plaster of a footprint because you're tracking a Bigfoot. Now that you say it's granite, yes, that makes more sense. So if I wasn't thinking about the latter, I'd have said granite for sure. I even started to wonder if Bigfoot had stepped on that cactus 🌵 😳 🤔,lol 😐 Ouch! 😊 Peace through Ahev
Usually, I look at the greater location, and then work backwards to what it is. This is eastern Washington, eastern Oregon, Rockies, Sierras (California, Nevada, ...) ? This is a highland desert location with highly uplifted deep bedrock turned into a large eroded mountain range with boulders. Eroded boulders appearing on a mountain range, ... that might be glacial erratics, but could just be a massively eroded uplifted bedrock or batholith. Yosemite granite erratics with the eroded Half Dome inside a glacier-scraped "U" valley ... although these boulders are on the top surface of a mountain range. So less likely a glacial erratic, versus a more-likely eroded batholith or uplifted and eroded granitic mountain range. Igneous mafic - dark iron and manganese. Igneous felsic - light or white quartz and feldspar. Aphanetic igneous (no crystals) - basalt. Phanetic igneous (large crystals) - granite. Granite - light and white multiple crystallizations of quartz, quartzite, feldspar (potassium silicate quartzite), and biotite.
Not to be too technical but I would call that a white rock. Am I right??? Ps. You said there were three types of rock (I thought there’d be a lot more than that.) so what are they exactly? Definitely curious about that.
I'm going to wait until you tell me and then put my guess down in the comments so I look like a smart feller, then I'll make sure and comment on your beauty, hoping for a comment, though happy with you liking my comment. I know I was being an asshole with that, but at the same time, I see it in your comments. I'm not saying this for a :-) or whatever, but you do do a really good job. Thank you for your descriptions of the rocks I have grown to love geology, Randall Carlson got me into it.