Chalcopyrite (twins) (classic locality)

Item Description

A beautiful and fine quality old Cornish Chalcopyrite from an undisclosed locality in St Agnes featuring superb, sharp, notably well-formed, brassy colored twinned crystals measuring up to 2.0 cm, sitting atop a matrix of sharp, lustrous, well-formed, colorless gemmy Quartz prisms. The Chalcopyrites have a wonderful antique patina on the surface, which makes sense as the piece dates back to the 1800s. Certainly one of the best pieces of this important classic material that we've ever had to offer in the auctions, with virtually no damage I can see with the naked eye. Showy, fine quality and highly desirable for any collector of Cornish material or sulfides.
From the collection of Albert M. “Al” Liebetrau (1938-2023) and Suzanne "Sue" Liebetrau (# Ch 1980).
Both Al and Sue were from Wisconsin originally, but lived in various places in the US and Europe, eventually ending up in Oregon. Al was a teacher (from high school to the university level) and statistician with degrees in math and statistics, and Sue taught English and worked as a technical editor for Battelle Memorial Institute. While Al has since passed away, Sue is still a very active member of the mineral collecting community. The Liebetraus were married for over 60 years (they were married in 1960) and assembled a world-class collection of fine quality crystallized display specimens, along with one of the great fluorescent mineral collections in the United States. Incidentally, Al was the former president of the Fluorescent Mineral Society, and was the main person in charge of putting together the massive number of displays at the 2021 Tucson Show (fluorescent minerals was the theme that year).
Mineral specimens from their collection have won multiple awards at various shows, including the prestigious Lidstrom Trophy for the best mineral specimen at the TGMS Show in Tucson, along with the Desautels Trophy for the best case. Additionally, the Liebetraus were awarded the Romero Award for best Mexican specimen, and the Bideaux Trophy for best Arizona specimen.
You can read more about Al and Sue and their lives at the following link: https://www.tandfonline.com/doi/full/10.1080/00357529.2023.2236000