Can someone tell me what these rocks are?

[WhatRock]

My friend gave me some rocks which she got from a friend who collected rocks. We don't know what they are, I love to use rocks in my animal enclosure and fish tank, so I need to know what they are before I even think about putting them in there. Thanks in advance, I can take more picture of needed.

 

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[dlb]

It's hard to say when looking at pictures only, but my guesses would be:

Left: Milky Quartz With Crystalline Deposits
Middle Top: Reddish/Brown Chalcedony (Chert, ?)
Middle Bttm: [undecided]
Right: Ugly Quartz/Chalkstone (hard to tell again)

What kind of stones are you looking to use in your tanks? Anything Specific?

 

[WhatRock]

Nothing realy specific, I currently have quartz in my fish tank, I just like pretty rocks and they make nice decorations, I just have to be sure not to put something that can release to much minerals into the water. They would be fine in my terrarium on land but the wouldn't really go with the set up too well I don't think.

 

[WhatRock]

The middle square it thin, flat and she tells me it came in a sheet but broke up. It's all orange and blue colours of that helps. thanks for your reply. I have a feeling the two white ones are the same type of rock.