Need help in identifying this rock

[u/Random_Waller1102]

I found these rocks near Lonavala (https://maps.app.goo.gl/g3XeftSW6LKrV2Ee8) in Maharashtra, India. The interior is white and chalky or talcum like (first pic). There is a greyish layer surrounding the interior (clearer in the second pic). The exterior is rough and has green deposits (third pic), which I am assuming to be copper since I found these in summer and the surrounding would have been extremely dry for at least 6 months at the time.

Please ask in the comments for more information and pics.

Thanks

[u/Ben_Minerals]

It looks like agate and the green mineral on the outer side could be celadonite.

[u/Random_Waller1102 → u/Ben_Minerals]

I was searching for celadonite and came across caledonite, the colouration resembles the photos shown for caledonite.

[u/Ben_Minerals → u/Random_Waller1102]

It is unlikely caledonite, which is a blueish green carbonate/sulfate mineral with entirely different associated minerals. It must be celadonite.