ZIPPEITE
Specimen zip-4

Dims: 2-1/2" x 1-7/8" x 1/4"

Wt: 12.7 g

Ambrosia Lake Dist., Grants, New Mexico, U.S.A.

This specimen is officially labeled "Zipeite, Coffinite". I don't know which is which, to tell the truth. The former is a potassium uranyl sulfate, while the latter is a uranium silicate hydroxide. They're both likely yellow, and interspersed upon one side of the flat host rock in crystals that are so small that they just look like a yellow dust that has been spread over it like mustard powder. It's neat stuff to put under a longwave UV light, though, and I imagine quite rare!

Dims: 1.9 x 0.9 x 0.8" (4.8 x 2.3 x 2.0 cm)

Wt: 20.3 g

Ambrosia Lake Dist., Grants, New Mexico, U.S.A.

This specimen consists of a chunk of shapeless brown host rock on which is scattered a thin dusting of Zippeite. The Zippite might occur in the form of tiny botryoidal clusters, but my loupe is not powerful enough for me to be sure. It basically looks like a bright yellow powder that has been scattered on the rock, though there are several tiny bits scattered on the other faces. I cannot define the host rock, but a small vein of what appears to be agate runs through it.

Dims:5.2x2.4x1.7" (13.2x6.1x4.3 cm)

Wt: 9.2oz. (261g)

Jackpile Mine, Laguna Mining District, Cibole cty., New Mexico

This specimen shows a bright yellow vein of zippeite in microcrystalline nodules in an arenaceous host rock. The zippeite is accompanied by a wider vein of semicrystalline uraninite. Although zippeite cannot be depended upon for fluorescence, this specimen fluoresces very strongly, a bright greenish-yellow color. This specimen shows no damage-it is an excellent cabinet-size specimen of this mineral.

Dims:2.5x1.4x0.8" (6.4x3.6x2.0 cm)

Wt: 1.5oz. (43g)

Jackpile Mine, Laguna Mining District, Valencia cty., New Mexico

This specimen consists of a thin vein of bright yellow zippeite running through the matrix rock. On either side of the zippeite vein are wider bands of uraninite. The zippeite is crystalline, although the crystals are tiny. This specimen fluoresces brilliantly under short wave ultraviolet light.