A very rich example of jeromite on quartz. The "jeromite" is not actually a mineral-- it is an arsenic, selenium, sulfur glass that lacks a definite crystal structure (hence the "glass" term) best known from this mine. In the past, I have seem small single quartz crystals coated with this orange-red material, but this discovery is the first time that I have seen such rich examples.
All of these have at least some quartz crystals broken off, it is inescapable, though they display exactly as shown. I would also say the color is a particular draw with these, as it's certainly better than the more common material with color caused by iron oxide, that comes from various worldwide localities .