This is a superb group of "nail head spar" calcite crystals on matrix, highlighted by the large, thick crystal, measuring 4 cm in length. The crystals are glassy and gemmy, totally colorless and pristine. The piece has superb balance and display quality, combined with this condition, and is one of the most impressive such examples in its size class we have seen. It comes from the David Corse Glen collection in the Kelvingrove Museum, Glasgow (by exchange out to Dick Barstow). It went from the Barstow collection in 1982 upon his untimely death, to the Ralph Sutcliffe collection, which went to the Greenbanks in 1991. An outstanding and beautiful calcite that is both an old classic while still meeting modern standards of superlative quality! Illustrated in the Greenbank Collection book, page 113, along with another calcite from the same collection shown below (LGC-42). Joe Budd photo, atop