Willemite with Rosasite - image 1
Willemite with Rosasite - image 2
specimen video

Willemite with Rosasite

$800.00

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Crystal Classics
Crystal ClassicsFeatured
Tucson, Arizona, USA
7,543 for sale·132 sold
Willemite, a rare zinc silicate species, is known to occur in quite distinctive well-formed crystals at Tsumeb mine. This small cabinet specimen features a bed of glassy, transparent, pale grey, stout prismatic Willemite crystals, terminated with rhombohedra, and with extensive coatings of blue-grey botryoidal Rosasite on top. Rosasite, a copper zinc carbonate hydroxide, is certainly not common at Tsumeb either, producing a rich combination specimen of these two unusual species. The Willemite is particularly well crystallized, but does really require magnification to be appreciated in full. It is quite different to the highly sought blue botryoidal Willemite from Tsumeb, but in this case the crystals are much sharper and well defined.

Product details

Species
Willemite, RosasiteAbout Willemite →
SizeSmall Cabinet
Dimensions8.5 x 5.0 x 3.2 cm
Listed on11/19/2025
Locality
Namibia, Oshikoto Region, TsumebRegional guide →
SKUCC45520

Learn more

Willemite
Mineral guide
Learn about Willemite
fluorescent zinc silicate with UV glow; daylight colors range from colorless to pistachio, iconic from Franklin–Sterling Hill and Tsumeb.
Willemite
Regional guide
Willemite from Tsumeb, Namibia
Tsumeb willemite is the zinc silicate for collectors who usually think of willemite as a fluorescent-mineral classic from Franklin, New Jersey, and then discover that Tsumeb rewrote the aesthetic rules. Here, Zn2SiO4 appears not as massive ore but as glassy to sparkling crystal groups, botryoidal crusts, radiating sprays, delicate acicular “lawns,” and rare individual hexagonal prisms. The colors are equally un-Franklin-like: white, gray, yellow, green, blue-green, turquoise-blue, pale blue, reddish brown, and the much-loved champagne to honey tones. The best pieces have a crisp, jewel-like presence in daylight, often on white calcite or dolomite, with the color contrast that Tsumeb collectors prize.