Cool secondary Calcite Sedimentation

[YoadD]

Hey my name is Yoad,

I work as a Geologist in Tunnel excavation in Israel.

 

I found these cool rocks in a karst cavity in the tunnel.

1. I think it´s really cool. take notice on the small conglomerate that developed on the stone.
2. besides that I´m curious to know what is the white cement? I think that is a kind of secondary calcite sedimentation.

*The rock in the environment where I found the rocks is mostly limestone.

 

thanks.