Strange reaction to cleansing Rose Quartz

BeastlySerenity

I cleansed an old piece of rose quartz today with sage smoke.
This piece of rose quartz was many years old, and actually had never been cleansed till now.
When I put it over the smoke it literally wept. It leaked a bunch of liquid, and it was dry to begin with.

It was something I have never seen before. Would this be a chemical reaction? Or something metaphysical?