Any knowledge of rocks or geodes?

[RifleBowPistol]

I found a rock today, not sure what it is. We live in a area, that is sandy on the surface, with a red clay below. For the most part, we don't have many rocks around our place, but I find patches of sand stone on occasions. There are a few areas on the property where we have some flint. We have a spring that flows when we have lots of rain, around that spring, is where the highest concentration of flint and a decent amount of sand stone. That's up near the top of the hill.

So today, when I was digging down near the bottom of the hill, I had to fix a pipe I broke. I found a round object, that seemed to be a chunk of iron. It was covered with sand, heavy, I could see a reddish color. At the time it seemed to be a chunk of iron. I washed it off, to try and figure out what it is. Once I cleaned it off, it almost looked like a sand stone ball, but it's heavy like it's iron. Then when I got to looking closer at it, it has small crystals in some areas, actually a lot of the stone, has very small crystals imbedded in it.

After looking at for a while, I am wondering if it's a geode. I don't think I have ever found anything like it before.

[.243 WSSM]

Looks like a sandstone concretion with calcite crystals. The heft would most likely be from hematite within during mineralization. Pretty cool find. What area did you find this in?

[diamond10x]

Sandstone concretion.

The larger crystals or clasts look to be quartz. If they were calcite (which is the most common binder in sed rocks), rain would have dissolved them more than likely. An easy way to tell is run a steel nail across them. If the nail scratches, its calcite, if the nail can't scratch it is quartz.

If you're in Bexar county im guessing you're south of SA?
As far as color and weight, it is because it is a sandstone concretion. It's bound by an iron carbonate not a calcium carbonate like typical sandstones, which keeps it from weathering at the same rate as the rock that forms near it.

[RifleBowPistol]

Looks like a sandstone concretion with calcite crystals. The heft would most likely be from hematite within during mineralization. Pretty cool find. What area did you find this in?

Between Seguin and Nixon. Thanks for the info.

[RifleBowPistol]

Sandstone concretion.

The larger crystals or clasts look to be quartz. If they were calcite (which is the most common binder in sed rocks), rain would have dissolved them more than likely. An easy way to tell is run a steel nail across them. If the nail scratches, its calcite, if the nail can't scratch it is quartz.

If you're in Bexar county im guessing you're south of SA?
As far as color and weight, it is because it is a sandstone concretion. It's bound by an iron carbonate not a calcium carbonate like typical sandstones, which keeps it from weathering at the same rate as the rock that forms near it.

We are east of San Antonio, between Seguin and Nixon.

I was thinking it was a chunk of iron, but when it was covered with sand, because of the color I could and the weight. But then getting the sand off, initially I was thinking sand stone, the coloring is very similar to much of the sand stone I find around here. But I have never seen sand stone in a sphere, usually sand stone, you can tell was layered, usually brittle and will break easily. Then this piece having crystals imbedded in it, really had me baffled.

Thanks for the info, I know vey little about rocks.

[Playa]

I used to find those on a place we quali hunted as a kid between Tahoka and Lubbock

[muzzlebrake]

Extinct Giant armadillo egg.

[Drycreek3189]

Extinct Giant armadillo egg.

I was thinking giant stone age M&M.