Can I make a rock like this?

Question

I found a piece of what looks to be partially formed or somewhat degraded sandstone and it looked as if it could be created without millions of years of pressure. : )

it has no definite grain or pattern,
it is extremely porous if it is indeed a rock,
it is composed of sand grains,
it is easy to turn it back into normal sand by hitting it with another rock of the same sort,
I am reluctant to say it's sandstone because of how brittle it is,
it has a slightly harder coating of dark sand on its exterior which looks burnt in a way,
I don't know what is cementing the sand grains together,
and the way the grains are cemented together reminds me more of a dried sandcastle than hard sandstone,
however this stone is cemented together, it is still significantly harder than a dried sandcastle

Answer 1

You probably have piece of sandstone or grain stone that has become brittle with weathering. As a sedimentary rock is weathered and transported the cement bonds between the grain grow weaker and weaker. The high porosity is probably due to some grains already having fallen out due to transport and weathering.

All rocks, esp. sedimentary break down eventually. That's why the beach is all loose sand.

Answer 2

You might try putting a drop of vinegar on it...depending on where you are, you might have sandstone that is loosely cemented with calcium carbonate, which can sometimes fizz a little bit in vinegar (though dilute hydrochloric acid is better). This sandstone can form if you have sand that has groundwater percolating through it that deposits the calcium carbonate--not all geologic processes take a long time! :-)

Answer 3

Probably sandstone, although granite can degrade in that fashion as well.

Answer 4

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