Willemite var. Troostite with Zincite and Franklinite - image 1

Willemite var. Troostite with Zincite and Franklinite

$400.00

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Crystal Classics
Crystal ClassicsFeatured
Tucson, Arizona, USA
7,543 for sale·132 sold
Excellent Willemite crystals of the variety Troostite compose the bulk of this large miniature from one of North America’s most famous mineral localities, Sterling mine at Ogdensburg in the Franklin Mining District of New Jersey, USA. Embedded in the Willemite are two black octagonal Franklinite crystals; a patch of white Calcite and a roughly 3.5 cm all-round mass of dark reddish-brown Zincite. The much larger of the two Franklinite crystals measures 2.5 x 2.5 x 2.5 cm. The Willemite fluoresces lime green and the Calcite vivid scarlet under both LW and SWUV, although the SW produces a much brighter fluorescence, especially in the Willemite. An excellent Ogdensburg specimen.

Product details

Species
Willemite, Zincite, FrankliniteAbout Willemite →
SizeSmall Cabinet
Dimensions5.8 x 3.8 x 7.4 cm
Listed on12/02/2024
Locality
USA, New Jersey, Sterling Hill MineRegional guide →
SKUCC32155

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 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-brown willemite crystals sit in white calcite with black franklinite and, less commonly, red zincite—an ore assemblage so distinctive that even small fragments announce the Franklin-Ogdensburg district at a glance. The daylight palette is earthy and old-mine: mahogany, brick red, honey brown, buff, white, and black. Under shortwave UV, however, willemite becomes the bright green signal in the rock, while calcite may burn red to orange-red and franklinite stays dark.