Please help me ID these rocks

[colen]

Hello everyone, I need a little help ID'ing a couple of rocks I got today. I have came across an endless supply of these so I will be excited if it is safe to use them in my tanks. I have put both of them in a bucket of vinigar and they did not fizz or anything liek that.

What are they, and can they be used in my tanks?

Thanks!

Edit: I forgot to add that they are not very smooth, which isnt a problem, but this may help you ID it. Also, from the looks of it they break/chip easily but this is not the case, they are very hard.

 

[colen]

This is the same picture as a first, but close up so you can see the rock/texture better.

 

[Ron]

The one of the left looks like lime stone. (not good for a tank) the one on the right looks maybe like slate? Slate is okay for a tank...not 100% positive on either of the ID's though. Maybe another member can give their oppinion.

 

[Teelie]

I think they're both slate, almost positive on the second one.

 

[colen]

Hmmm...

I know what slate looks like and I have peaces of slate, neither are similar to it. It would be nice if it is limestone, as I have just setup an african cichlid tank.

I am thinking maybe they are sand stone? They are not real smooth, although they are layerd as you can see from the 3rd picture.

edit

The first rock (the lither colour one) kind of has a sparkle to it.

 

[Teelie]

Looking at rocks is only one of about 7-8 ways to find out the composition of a rock. Slate comes in many colors and sometimes in different textures so it's not always simple to eyeball it.

 

[FishEnthusiast]

I thought slate broke easily. If that is the case, they couldn't be slate as they are hard right?

I know nothing about rocks, so I can't help, sorry.

 

[Teelie]

I took Geo last semester and I know a bit of the basics though the class was boring as hell. Slate can be easily breakable but there are different kinds of slate just as there are rocks. Depending on how thick the slate is and what it's composed of and what concentrations, it can be hard.

Whatever the rock's compound is, the vinegar method is still a good one to determine if it will alter the pH of the water or potentially anything harmful. Where did you find it?

 

[platyfreek]

I know nothing about rocks sorry

 

[freshcichlid]

whats wrong with limestone?
and not to take over this thread but this is some rock i jsut got, is it bad !
its kinda sandy, white on one side and white with some black/dark areas..

 

[Opcn]

Platy freak, if you know nothing about rocks please dont respond in a thread about rocks, its just taken as spamming.

Freshcichlid, limestone will send PH soaring, read the FAQ about stone please

 

[FishEnthusiast]

I took Geo last semester and I know a bit of the basics though the class was boring as hell. Slate can be easily breakable but there are different kinds of slate just as there are rocks. Depending on how thick the slate is and what it's composed of and what concentrations, it can be hard.

Whatever the rock's compound is, the vinegar method is still a good one to determine if it will alter the pH of the water or potentially anything harmful. Where did you find it?

Thanks, I learned something new today. I try to do it everyday. Hope you find out what kind of rocks they are colen.

 

[freshcichlid]

Freshcichlid, limestone will send PH soaring, read the FAQ about stone please

thank you for the help, sorry it was an inconvenience, i did read the thread but i still cant decide which rock mine is, thats why i posted it
if anyone can narrow it down for me or give me a yes or no i would appreciate it
thanks

 

[Teelie]

and not to take over this thread but this is some rock i jsut got, is it bad !
its kinda sandy, white on one side and white with some black/dark areas..

Could it be sandstone?

 

[The-Wolf]

IMHO
the light one is sandstone and the darl one is slate/shale