Please help identify strange green and other rocks from the Aegean Sea

[AnnaNova]

Hello everyone,

 

I am very new here, but I have been a very passionate amateur collector of pretty stones and minerals I am able to find around. Earlier this summer, I was diving at a beach in the Aegean Sea and found several interesting rocks that I would be happy to identify.

 

Starting with the green mystery - I found it buried in the sand under the water. I realize it might be man-made, but it does not feel painted. When I tried to chip it with another regular rock, the other one got painted green  but the green one didn't really chip or show any colors underneath. I know very little about these things, but I am wondering if this could naturally happen somehow. The other peculiar thing about this is that the stone is oddly light in weight. It is 10cm x 5cm.

At the same beach, again underwater, I found some suspicious bones that I will post in the Fossil topic for identification, but I also found some other large rocks that had obvious veins in them. When I cracked them open, they turned out amazing. If you can point me to what these are as well, I will really appreciate it.

[Ludwigia]

I'm not at all sure what your green stone might be, but the veins in the other rocks are either quartz or calcite. Calcite would fizz under a few drops of a weak acid like vinegar essence, quartz would not.

[ynot]

The green piece looks like malachite, but that would not be "light". Could be melted then beach worn plastic- see if it will burn.(red hot pin.)

The rest look like quartz/agate with crystalized vugs.

[AnnaNova]

Thank you both for the information provided!

 

For the green one, I tested and it is not plastic, has the exact feel and effect of stone, it is very hard actually, I could barely scratch it.

[rocket]

2 hours ago, AnnaNova said:

For the green one, I tested and it is not plastic, has the exact feel and effect of stone, it is very hard actually, I could barely scratch it.

 

perhaps some kind of glass or ceramics? Unusual green color and shape, looks more like an industrial remain than a natural stone. But, never seen one like this before

Edited July 24 by rocket

[ynot]

7 hours ago, AnnaNova said:

Thank you both for the information provided!

 

For the green one, I tested and it is not plastic, has the exact feel and effect of stone, it is very hard actually, I could barely scratch it.

Can you do a hardness test, mohs scale? A streak test - color? Specific gravity?