We can prove that your rock was designed in a few easy stages.
(1) Do not find out anything about the geological processes that actually produce rocks. This step is crucial and cannot be omitted.
(2) Your rock either does or does not have a crystaline structure. In the first case, describe it as ordered, in the second case describe it as complex.
(3) Commit the logical fallacy known as petitio principii --- you remember how we practiced that in Sunday School? Declare loudly that whatever is ordered (or complex, depending on the properties of your rock) must proceed from an Intelligent Designer, thus assuming the thing you were required to prove.
(4) Announce that "evolutionists" claim that your rock came into being "by random chance".
(5) Call everyone who disagrees with you an atheist.
(6) Try to convince a judge that what you are doing is science. Fail.
1 - so anyone with half a wit will object that you not knowing the law doesn't mean that there isn't a law (which, btw, would be better rendered as process), and they'd be right. But, here's the thing, the same applies to everything; just because no-one alive today understands the process that led to something doesn't mean there isn't a process.
2 - I say 'clearly' because I have no idea what the chance is. Neither does anyone else. In the ID slight of hand they give you examples like tossing coins and pretend you can extend this to unknown areas. You can't. You can't say anything meaningful about the probability of something until, and unless, you understand the processes around at the time of its occurance.
And there's a second problem here too. Let's suppose that we could find out the probability and it came out to 1x10-18. Gosh, we'd go, that's crazy unlikely, surely such a thing could never happen!
Is that right? Well, let's suppose your rock is 10cm x 10cm x 10 cm, that's 0.001m3. The Earth's crust is varies between 5 and 70 km thick; let's take the lower of those numbers. The Earth has a surface area of 5x108km2, so that's a volume of rock of
5x108km2x5km = 2.5x109km3 = 2.5x1018m3.
Which means there are 2.5x1021 pieces of rock of the size of your sample on earth; so if your rock formed by chance we should expect that there are 2500 pieces of rock of that configuration on earth. Not so unlikely that it exists now, is it?
your first task is to locate a copy of the offical ID theory ...this may prove hard as it seem there is in fact no theory as such ..
missing info includes
no list of starting conditions no list of raw materials no list of designers no list of workers .. after all designes only draw up the plans .. no list of the health and saftey regulations imposed on the project .. no details of if it worked ..
If you do find a copy of the theory please share it with us ..