anyone know what this rock is

[red-devil0602]

anyone know what this rock is and will is cause any problems in the tank It's just like this one in the picture but really smooth.

 

[The-Wolf]

looks like a very colourful piece of basalt

Basalt is a hard, dark volcanic rock. It is formed by lava that flows from volcanoes or from cracks in the earth and hardens. There are many types of basalt. They range from fine-grained rocks with uniform crystals to crystal poor glasses. Basalt consists chiefly of two minerals, pyroxene and plagioclclase feldspar.

Basalt is the most common volcanic rock in the earth's crust. The ocean floor is covered with basaltic lava that flowed from the mid-ocean ridges.

Basaltic lava is extremely fluid and may flow long distances from its eruption site. When basalt erupts under water, it forms rounded pillow-shaped lumps called pillow lava. When it erupts on land, its surface has either a smooth, ropelike texture, or a jagged angular one.

Dependant on how much feldspar is in the basalt, it is fine for aquariums; however you may wish to smooth out the sharp edges first.

 

[red-devil0602]

thanks again wolf

 

[One_Trick_Pony]

my first thought was that it looked like obsidion but of coruse not not balck. good call wolf it sure looks volcanic

 

[smb7676]

I have some in my tank and it isn't a prob. Mine has some metal in it though cuz it sticks to the algea mag when I wipe it off.