A good San Diego indicolite, which is rare in such size and condition anyhow, but the HISTORY here is so neat! Note how the piece was passed from one major collector to another, through decades. John Sinkankas even sketched the piece on the inside cover! A watercolor painting shown on the inside is from the same pocket, and a group photo shows this piece, as well. Chuck paid money for the book, having actually tracked down the book from Barlow's grandson, Chris Dearing, after Mr. Barlow had passed away. Barlow never sold the book when he sold the collection, keeping it for himself: it stayed in his personal library as his own copy. This is, pedigree aside, a very FINE indicolite for San Diego which has only rarely produced pure end-member indicolites of any quality. As a side note, there is an association of manganocolumbite on the bottom of the specimen. It is pristine and unrepaired, and beautiful when lit up. So, you are paying for a significant and rare San Diego piece, but admittedly at a premiium to get the historical pedigree with it. These are great collectors, all! I'd own anything they thought worthy to pass from hand to hand.