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

Willemite with Rosasite

$450.00

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Crystal Classics
Crystal ClassicsFeatured
Tucson, Arizona, USA
7,543 for sale·132 sold
This very rich miniature Willemite specimen is from one of the all-time great occurrences for the species - Tsumeb mine. This quite dense, somewhat botryoidal mass is probably over 90 percent Willemite, but its crystal form only really shows through on the inner side of the botryoidal aggregate. The crystals are glassy and bright and present the classic short hexagonal prism form typical of Tsumeb mine specimens. Scattered amongst these pale blue-grey crystals are bright turquoise blue flashes of Rosasite, making for an attractive combination. The outer surface of the Willemite botryoids are orange-brown with a sugary finely crystallized texture with the glassy Willemite crystals appearing around the periphery. The individual Willemite crystals reach 3 mm in length. A richly crystallized example of this rare zinc silicate species which looks superb under magnification. Ex Weyand collection.

Product details

Species
Willemite, RosasiteAbout Willemite →
SizeSmall Cabinet
Dimensions7.8 x 4.6 x 2.3 cm
Listed on09/17/2025
Locality
Namibia, Oshikoto Region, TsumebRegional guide →
SKUCC52610

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.