Found some rocks, can I use them?

tmy420

AC Members
Oct 16, 2005
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I found some rocks while hiking today and I was wondering if I can put these in... They are like aridecent(spelling?) on the outside, like a whit blue.. I forgot what they call these rocks but does anyone know if I can put these in? If I took a pictures with my crappy webcam would anyone be able to tell?
 
2 of them look glassy
 
glassy rocks are often formed from lava or magma (ingeous rocks, and i'm sure i misspelled that), obsidian for example, and are fine for aquariums. the only concern about obsidian is the razor-sharp nature of their edges.

yeah, post some picks if you can.

the real concern for a rocks' suitablity is the minerals they contain, and if they will disolve in water.
 
Glassy rocks...

Picture 4.jpg Picture 5.jpg
 
looks like quartz to me (silicon)

you should be fine. boiling never hurts.
 
This one is dull grey and rough with white lines

Picture 1.jpg
 
white rocks.... with a lil crystal things...

Picture 3.jpg
 
lines suggest sedimentary rock, can consist of any number of materials.

i think you might be ok, but an acid test might be a good idea if you want to avoid a calcium carbonate source (lime)

theres another thread currently active that discussed this.
 
last one looks like granite or... man i cant remember.

granite is fine in most cases as it too is largely silicon. there are other minerals, but are trapped in the lattice of the crystal structure.

my geology is a little rusty, so if anyone wants to sound in, that would be great.
 
thanks indiginess
 
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