In 1980, Brian Huntsman made the single greatest find of Linarite crystals, and this killer thumb is undoubtedly from that same find. Very good luster and a few coatings of Malachite only serve to accent the amazing deep azure blue color, which can appear like a hint of blue flame in just the right lighting. Backlit, its almost gemmy! On top of all this, the crystal is a fishtail twin! This is a world class linarite thumb. 1.1 x .8 .4 cm