Carboniferous wood with crystals

[Svetlana]

Hello.
I want to show you some examples from my collection.
This is a Carboniferous wood. The preservation is not the best, but for me these samples are interesting for the presence of crystals of smoky and ordinary quartz on them.

A sliver that has broken off from a larger fragment. There is more quartz than wood

 

Perhaps a stem or stump - it is almost round in cross section. And thickly overgrown with crystals.

 

Large flattened fragment; perhaps the first sliver was from it.

[Svetlana]

Few more fragments.

Thanks for attention.
Have a good evening.