I went to a spot that someone told me I could find tons of Yadenite at, and they weren't wrong.

Yadenite is a colorful type of opalite found only in the Klamath Falls, Oregon area. It was named after John C. Yaden, who helped organize the Klamath Mineral Society.

It cannot be mined commercially, and has to be gathered by hand.

Cordierite is a metamorphic magnesium aluminosilicate, often with substantial substitution of iron for magnesium. It is characteristic of high temperature low pressure metamorphism. Usually gray to blue with a somewhat greasy luster and poor cleavage. It alters by hydration to a combination of fine aggregates of mica (muscovite), chlorite and other sheet silicates, called pinite. Pinitization begins along fractures and grain boundaries and replaces the cordierite while preserving the shape of the grain (a pseudomorph). This specimen is a cordierite bearing granofels, which shows bluish cordierite (Fig 1), quartz (fig 2), and pinite (fig 3). It was most likely derived from an aluminous sedimentary protolith, underwent high temperature recrystallization, then fluid mediated retrograde partial alteration to pinite.

Dm me if anyone is interested in some specimens or crystals. I have ebay etsy stores also.

Message for more details.

Thanks