Anyone want to make a guess at what type of rock this is

[gambs]

LooKing for these types of rocks as my goal is to recreate this. uploadfromtaptalk1390172401580.jpg

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[itsyitz]

The green is from moss. Its not the rock color. You can do that effect in most any rock, but those pictured are probably just slate.

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[gambs]

Its algae growth. But not all rocks can have that type of growth on them

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[troy tucker]

Looks like landscape stone. I think it sand stone.

[gambs]

Havtn seen the sandstone dark grey like that , just the tan color. Will have to check out the rockyards

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[AHP]

Havtn seen the sandstone dark grey like that , just the tan color. Will have to check out the rockyards

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Looks like moss rock w/ moss on it.

[SunnyHouTX]

Those are just chunks of regular granite with moss/algae growing on them.

[mnemenoi]

Try placing them in a shallow kiddie pool outside and letting them get algae covered before moving them into the tank