Erythrite, commonly known as Red Cobalt or Cobalt Bloom, is an arsenate-hydrated cobalt mineral that typically forms crusts, aggregates, and thin prismatic crystals. It is a member of the Vivianite group and typically occurs alongside other Cobalt varieties. Moreover, it can form alongside natural Silver deposits. It is primarily known for its crimson hue, though it can also be present in other colorations.s purple, pink, peach, and grey. Lighter color Erythrite usually indicates higher levels of Nickel. This mineral was first discovered in Saxton, Germany in 1832 by François Sulpice Beaudant. Remember to wash your hands immediately after handling erythrite. It is a secondary hydrated cobalt arsenate and is considered toxic.