• 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

2,237 questions

3,913 answers


132,299 users

What kind of rocks are these??

0 votes


Just a mom from south Jersey here. Zip 08343, if it matters. After sort of digging around my pond in a billion rocks, my son and I found some and I don't know exactly what they are. See pic... I am thinking the round ones on the left with "stuff" ( forgive my lack of technical knowledge, school was a long time ago) in them are some sort of geodes? What type, i do not know.... the green see thru one on the right is really cool.... has a couple bubbles of whatever material it is, inside of it. The one below that looks like a gold nugget (that I wish it was, but I won't be that lucky) - I have no idea... It measures on the metal/gold side of a metal detector reading, but I"m at a loss, yet again. And I suppose the small pieces are some sort of crystal? I could be totally wrong here, but I don't really know what I"m looking at and my son is 9, so saying he's inquisitive is an understatement. Any and all help here would be greatly appreciated!! Thanks so much!!

asked Jun 29, 2016 by Cookiebear (170 points)

1 Answer

+1 vote
The eight larger stones are geodes. The materials inside are quartz, chalcedony, agate....maybe more. The agtes are easy to see because they look to have banding. From left to right and top to bottom you have a column with two geodes, three and three. Stones 1&2, stones  3,4 & 5 and stones 6,7 & 8.

Stones 1 and 3 appear to have a smooth white or gray mineral called chalcedony. Very hard. Stone number three will feel very smooth and almost waxy. The chalcedony is actually gray or white and will not be banded like the agate. You will not be able to scratch it with a nail.

You can clearly see agate in every one but stone 2. Look at stone 1. The banding in the upper right quadrant of the stone is visible and the best example to look at to see the banding. After looking at that one and being able to see what agate is you can see it in the other stones. Some of it is different colors. Agate and chalcedony are both different forms of microcrystalline quartz. The different colors of the banding and material is caused by, for example, high concentrations of iron or other elements which were present in the silica rich waters which were abundant when the agates were formed.

The other white material is probably quartz. That is macrocrystalinear or you can see the crystals unaided. The purple could be amethyst which is purple quartz..

The smallest ones I cannot see wll enough. The metal a magnet would not attract most gold and silver. If it is magnetic it probably isn't gold/silver. It might be pyrite but I cannot tell.

The green one might be beach glass. Bubbles usually mean glass. All the same, if you want to make a trip out of it, take the specimens to a rock shop and they can advise you specifically.

Hope that helps.
answered Jun 30, 2016 by Weasel (58,980 points)
Thank you so much!!

Related questions