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Exceptional Large Stolzite Crystal

The Mineral stolzite




Stolzite forms a series with the more common Wulfenite, which contains molybdenum in place of the tungsten. It is very similar to Wulfenite, though often with a paler color, (although Stolzite may also be as brightly colored as Wulfenite). Stolzite specimens are rare to encounter and generally come from localities no longer producing, making this mineral a highly desirable and expensive classic among minerals. Stolzite is named in honor of Czech mineralogist Joseph A. Stolz (1803-1896).
Chemical Formula PbWO4
Composition Lead tungstate
Color Cream, tan, beige, yellow, orange, and brown. Rarely gray to white.
Streak White
Hardness 2.5 - 3
Crystal System Tetragonal
3D Crystal Atlas
(Click for animated model) 
Crystal Forms
and Aggregates
Crystals are usually dipyramidal, though often with flattened terminations. Also tabular in both thin or thick form, and often with growth layers, or octagonal corners. Crystals are sometimes striated. Also grainy, encrusting, and in dense groups of dipyramidal crystals. Occasionally in well-formed pseudo-octahedral crystals, possibly as a Scheelite pseudomorph.
Transparency Transparent to translucent
Specific Gravity 8.3 - 8.4
Luster Adamantine, resinous
Cleavage 2,1
Fracture Subconchoidal to uneven
Tenacity Brittle
Other ID Marks May be fluorescent yellow in shortwave UV light, and dark orange-red to red in longwave.
In Group Tungstates and Molybdates
Striking Features Color, crystal habits, and mode of occurence.
Environment As a secondary mineral in hydrothermal replacement lead deposits rich in tungsten.
Rock Type Sedimentary, Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 3
Demand (1-3) 1


Stolzite AUCTIONS

POLYMORPHS
Raspite


USES
Stolzite is a rare and desirable collectors mineral. It is a minor ore of tungsten in tungsten deposits.

NOTEWORTHY LOCALITIES
One of the finest Stolzite localities, having produced some of the largest, brightly-lustered, cream-colored crystals, is the Sainte-Lucie Mine, in St Léger-de-Peyre, France. Small orange crystals come from the Clara Mine, Oberwolfach, Black Forest, Germany; and dense aggregates came from Zinnwald, Saxony, Germany; and right across the border in the same deposit in Cínovec, Bohemia, Czech Republic.

In Australia, bright orange crystals were famous at Broken Hill, New South Wales; and small crystals were found in the Kara Mines, Hampshire, Tasmania.

In the U.S., exceptional, pseudo-octahedral crystals of Stolzite, that were once actually thought to be Scheelite, came from Darwin, Inyo Co., California. Thin platy crystals come from the Fat Jack Mine, near Crown King, Yavapai Co., Arizona; and small white crystals from the Black Pine Mine, Philipsburg District, Granite Co., Montana.

COMMON MINERAL ASSOCIATIONS
Quartz, Limonite, Cerussite, Mimetite, Vanadinite, Pyromorphite, Barite, Wolframite, Raspite



stolzite PHOTOS
 
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