This is bismuth — a natural chemical element that chemically resembles arsenic and antimony. But there’s a catch with this crystal. While bismuth occurs naturally in the Earth’s crust ...

and bismite (bismuth oxide), but also occurs in its elemental state, in the form of crystals with an oxide layer of varying width that reflects iridescent colours (pictured). It is commonly ...

Experiments have demonstrated ... like sheets of antimony and oxygen nestled against bismuth atoms, according to ZME Science. Inside the crystal, hollow inclusions called 'en echelon veins ...