Guide
Willemite specimens for sale
61 for sale · $150–$15,000 USD
208 in the gallery
Willemite is a zinc silicate mineral that forms translucent to transparent crystals with a vitreous to resinous luster. It typically appears in striking colors such as green and yellow to orange, and can occur as prismatic or elongated crystals often well-formed and sharply terminated. Crystallographic habit commonly includes elongate, prismatic, or pyramidal forms that catch light from multiple angles, producing vibrant color in well-cut specimens.
- Formula
- Zn2SiO4
- Rarity
- Common
- Stability
- Stable
- Collector interest
- Very High Interest
- Classification notes
- Silicate mineral; Nesosilicate (orthosilicate) Zn2SiO4
Key characteristics
- Crystal system
- trigonal
- Mohs hardness
- 5.5
- Specific gravity
- 3.89–4.18
- Luster
- vitreous, resinous
- Transparency
- transparent, translucent, opaque
- Color
- colorless, white, gray, brown, red, orange, yellow, green
- Streak
- white
- Cleavage
- poor
- Fracture
- uneven, subconchoidal
- Crystal habit
- prismatic, granular, massive, radiating
- Gem mineral
- Fluorescent: green, yellow
- Classic / historic
Buy Willemite specimens
View all 61Where Willemite is found
Top localities
- Franklin12 specimens
- Franklin Mine12 specimens
- Tsumeb11 specimens
- Erupción Mine8 specimens
- Sterling Hill Mine7 specimens
- Buckwheat dump mineral collecting site6 specimens
- Mammoth-Saint Anthony Mine6 specimens
- Berg Aukas Mine5 specimens
- Franklin Mining District4 specimens
- M’Fouati mine4 specimens
Guides
All guides
Guide
Willemite from Tsumeb, Namibia
Willemite — Tsumeb, Namibia: glassy to sparkling crystals in blue-green to champagne hues, botryoidal crusts and hexagonal prisms; classic oxide-zone formation.Read guide
Guide
Willemite from Sterling Hill Mine, New Jersey, USA
Sterling Hill willemite is one of the classic collector materials of American mineralogy: a zinc silicate, Zn2SiO4, that can look modest in daylight and then turn electric green under ultraviolet light. In the best pieces, tan to reddish-b…Read guide
Guide
Willemite from Franklin Mining District, New Jersey, USA
Willemite, Franklin Mining District — renowned for vivid shortwave UV fluorescence, daylight crystal variety, and the classic franklinite–calcite association.Read guide
Guide
Willemite from Berg Aukas Mine, Namibia
Willemite from Berg Aukas, Namibia - pastel to ivory crystals, drusy sprays, stalactites, and UV fluorescence; prized for texture, color, and provenance.Read guideAbout Willemite
Significant collections include specimens from Namibia, the USA, Mexico, the Republic of the Congo, and Iran, where Willemite occurs alongside other zinc minerals and gangue minerals. It is frequently found in hydrothermal or pegmatitic environments, sometimes in association with willemite-bearing ore deposits and feldspars. Specimens from famed localities are prized for their color, clarity, and crystal integrity, making them popular among matrix and cabinet collectors alike.
