Blackjack turquoise is a distinctive and rare gemstone known for its striking contrast. Mined by the Otteson family in Tonopah, Nevada, it features vivid blue, green, and sometimes orange hues set against an intense, dark chert or black matrix, creating a dramatic, almost "lightning across a midnight sky" appearance.

This unique ribbon or brecciated pattern makes each stone a natural, one-of-a-kind artwork, highly prized by jewelers and collectors. The specific blue color found in Blackjack turquoise is considered particularly rare.