“4.1 x 3.8 x 2.7 cm. Penetration twin of glassy and gemmy, rich lemon-yellow fluorite. These came out in a few long and dangerous underground collecting trips undertaken by Greenbank and friends, in 1969-1972. This particular piece was found in about 1970 from the Dow Scar Flats - the left hand side of the horse level, near the pillar area 400 ft. from the portal. It is unusual in that, unlike the other fine Hilton twins in the collection or that we have (rarely) seen, this specimen has a thin blue zone at the terminations of both crystals. Purple fluorescence in daylight and UV. Illustrated in the Greenbank Collection book, page 106. Joe Budd Photo. ”