What am I doing over Christmas break? Well raking leaves, fixing things, studying, cooking, and looking at rocks.
Recently, someone brought me a vaporizer I gave them last year. It was not working like it should and they wanted me to look at it. Well, after taking it apart, the heater elements were caked in the material shown. Just a guess, but it could be salts, calcium, and other minerals from the tap water. I used a pair of pliers and a screwdriver to break it away from the element.
The next picture is from a rock taken from a quarry. It has a small section of pyrite that has started to oxidize. The ruler is showing centimeters.