AusBonsai

I am liken the Lichen

dats a good looken rock, as far as rocks go

Hey Damian,

A really nice shape to the stone and the lichens will only get better with the years to come. To keep them healthy the stone is best placed in a shallow tray of gravel or soil & placed with your trees so they receive the nightly dew. With the added water that splashes on them while you are doing your trees will help speed the lichens growth until the different types meet, then they start to do all sorts of interesting things.

Matt

It currently resides in a pot next to a plant in training so it does recieve all the goodness the plant gets. I should post some more.

A interesting piece of Scoria.

Guess the type of rock and you could win

I picked it up while walling at a property in Box Hill.

I'll have a guess at over-furnaced brick?

Well done Watto.

You are as close as you need to get. It is indeed man made, its a half of a lump of fence post concrete.
On the underside is a square cavity where the post sat, its going to look good with something growing on it

You win