Dims: 5.2 x 4.5 x 2.4" (13.2 x 11.4 x 6.1 cm)
Wt: 2 lbs, 2.2 oz. (969 g)
Hulcani Mine, Ancash Department, Peru
The Siderite on this large hand specimen consists of a crust that covers nearly half of the base rock. This crust is made up of countless trigonal Siderite blades that do not exceed 0.4" (1.0 cm) in diameter (most of them do not exceed 0.2" or 5 mm in diameter). Though areas of substantial damage are present and visible, the crust is generally in good condition. All of the crystals have a somewhat rounded shape, and most are warped due to intense intergrowth, but a few show well-defined edges and clean faces. Their brown color and pearly luster are standard for their species, and they are translucent at best. Accompanying the Siderites are several orthorhombic prismatic crystals that look very much like celestites. I am almost sure that they ARE celestites, though I may well be wrong. Most of these crystals are broken, but a few are undamaged and in excellent condition. Their form is also excellent, and all are transparent and very clear. They appear to be colorless, but from some angles a few of them seem to have a very faint, almost violet tinge. The chalky base rock appears to be coated in a few places with druses of tiny, white quartz crystals, and is suffused with either bornite or chalcopyrite.