• Register

Information for users from the old Q&A site
If you have an account from our old Q&A site, your account was transferred over, but you need to reset your password and confirm your email address.
Reset Password here
Confirm Email here

2,235 questions

3,905 answers


110,089 users

Rock in Fish Tank

+1 vote

Asking for a user who had trouble posting:

Can anyone identify this rock and comment on whether it would be an issue to have it in a fish tank?

alt text alt text

asked Feb 22, 2015 by yohaas (1,030 points)

3 Answers

0 votes

Looks like it is some sort of sandstone with a quartz vein. Hard to really tell without a better look at it. If it is indeed sandstone and wasn't painted, then it should be fine in a fishtank. Calcium-based rocks or carbonates should be avoided because they can make the water hard, and sulfides should be avoided since they can leach metals into the water.

answered Feb 23, 2015 by hershel (52,800 points)
0 votes

I saw the pictures you had forwarded to Joseph, and still not sure from those pictures as to the exact identity of this rock, other then it having quartz veins. Indeed sandstone is usually soft and often brittle, but its sometimes more durable. It doesn't look like any calcite is in there, so you would probably be safe on that end from hardening the water. Its also less likely to be metallic sulfide, which can leach metals, but there isn't a way to tell forsure by just your pictures. While it will most likely not cause an issue, I would suggest you play it safe when putting it in a fishtank.

answered Feb 23, 2015 by hershel (52,800 points)
0 votes

I see the quartz veins and this seems to me to be iron ore with the yellow being maybe limonite. That

would account for the colors. I can't be sure.

answered Feb 23, 2015 by Weasel (58,940 points)