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Pyrite crystals exhibited octahedral, pyritohedral, and equant anhedral (i.e.
A thumbnail-size pyrite cuboctahedron from Traversella, Piedmont, Italy has, dead in the middle of each octahedron face, a pit of what seems to be pyritohedral outline, all pits being of exactly the same size.
Shortly after that show Burnham went on a collecting trip through the Southwest and Mexico, coming back with specimens of wulfenite and mimetite from the Ojuela mine, boasting that "advanced collectors who have seen this [material] have enthusiastically acclaimed it, without exception, to rank with the world's finest specimens." He also offered tetrahedrite in large (half-inch and up) crystals with brilliant pyritohedral pyrite from Utah, in cabinet-size specimens to $25.
Crawford (firstname.lastname@example.org) I picked up a superb thumbnail-size cluster of pyritohedral pyrite from the great classic locality of Elba, Italy, for exactly six dollars.
Tarnished pyritohedral crystals of pyrite to 1 cm with beautiful iridescence appeared at the end of 2006, together with iridiscent galena crystals (see under galena).
Rosettes of arseniosiderite perch on the faces of some large pyritohedral crystals of skutterudite from Vein 59, Ait Ahmane.
Pyrite occurs as subhedral cubic or pyritohedral crystals rarely larger than 1.5 cm, as masses and, rarely, as reniform coatings of radial, fibrous crystals on quartz.
Mirror-faced, blindingly lustrous, not at all edge-rounded, spinel-law twinned galena crystals reaching 3 cm rest, or stand straight up, on massive pyrite or (in two elite pieces I saw) on groups of bright, sharp, pyritohedral crystals of pyrite, themselves to 2 cm on edge; a little white calcite gets in there too.
The crystals are pyritohedral and range up to about 1 cm.
According to Konstantin, the site is a now-inactive iron ore quarry where magnetite was the chief ore species; and sure enough, massive magnetite is the matrix for sharp, very bright, simple pyritohedral crystals of pyrite, mostly around 1 cm but exceptionally to 2.5 cm.
Pyrite crystals from the Main Stage vein deposits are generally pyritohedral or, more rarely, octahedral.
Distinct, small, poorly formed pyritohedral crystals have been seen locally.
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