A very well*-formed example of Goethite crystals on a Smokey Quartz prism. The Quartz is unusual in that it is doubly terminated and in very good condition. The "Ongeite" is in blocky curved rhombic crystals and stacked groups. In much better condition and distinct form that we usually see, this is from an older Northeast collection obtained from Lazard Cahn (no label however) in the early half of the 20th century. A distinctive and classic American specimen these are unlike anything else from any other locality. A few areas of the Quartz have red staining that is also typical of this region.
Is this a Colorado Gwindel? A radiating ball of Goethite crystals sits on a single flattened Quartz crystal composed of several parallel growths that have a pronounced twist. The form is "Gwindel-like" but as the back side is less twisted I am not certain if this can be classified as one. I have asked some Quartz experts and they are divided mostly because the crystal tappers to a wedge like form and is thus not fully typical. Whatever it can be classified as, it is unusual and a Colorado classic locality piece. This was broken and repaired many years ago (it was in a collection by the 1930's) and it is visible on both sides (more so in the back). There is some chipping and damage to the Goethites, but it overall is in good condition.