strange crust and its underneath

[eruyanik]

this stone has an interesting crust on it. a very thin layer cracked here and there and there is this something dark coloured surface of the inside.

i will have to chip and see what is inside but before that i would want to ask anyone have this kind of sample before or is there anyone has any idea about it.

 

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[DDancer]

Go ahead and chip it, likely the crust your looking at is a rind of decomposed material of the core mineral. Its not uncommon for minerals to have rind's after long exposure to the environment. That's why one chips a stone to get an idea of what its made of in its unaltered state.

 

[eruyanik]

it is strangely enough i have chipped it and see that was not the crust.

the stone has its own texture with that brown garnet windows here and there.