Kris corner on Instagram: "These are gypsum crystals, specifically the selenite variety (often also called clear selenite). Here’s why I’m confident about that: * Long, bladed crystal habit — very characteristic of selenite * Transparent to translucent with a glassy/pearly sheen * Strong parallel striations running lengthwise * Flat cleavage faces (gypsum cleaves perfectly in one direction) * Rusty brown/orange patches — common iron-oxide staining on natural selenite * Not fibrous enough to be s