Hokkaidoite Inclusions in Opal - Longwave UV (365nm)

Hokkaidoite inclusions in Opal under LW UV! Extremely bright & colorful, even with ambient daylight! Largest piece is approximately 5.9 cms across! These also look great under SW & MW UV too, which can be seen below!

Hokkaidoite, or "Hokkaido Stone", is an organic mineral, found in Shikaribetsu Lake, Shikaoi (Shikaoi-Chō), Kato District, Tokachi Subprefecture, Hokkaidō Prefecture, Japan, and just recently discovered in 2023! According to Mindat, it is most likely a Polycyclic Aromatic Hydrocarbon (PAH), possibly anthanthrene or benzo[ghi]perylene, but there are at least 20 more possibilities. It is the first polycyclic aromatic hydrocarbon mineral discovered in Japan. It was approved & registered for naming by the International Mineralogical Association (IMA) in January, and then presented at the Japan Geoscience Union Meeting later in 2023. The areas where Hokkaido Stone is found are protected and not open to the public. Some specimens are gradually making their way into the market over time, but are still quite limited in supply.

Hokkaidoite Inclusions in Opal - Shortwave UV (254-255nm)

Hokkaidoite Inclusions in Opal - Midwave UV (310nm)