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| Chemistry:
Pb(WO4)
[Lead
Tungsten Sulfate] | Discovered
in 1845;
IMA
status: Valid (pre-IMA; Grandfathered). Stolzite
is named after
Dr. Joseph Alexis Stolz (1803–1896), Teplice, Czech
Republic, who provided the first specimen. |
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Classification
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Mineral
Classification: |
Sulfates |
Strunz 8th
Ed. ID:
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6/G.01-40
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Nickel-Strunz 10th
Ed. ID:
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7.GA.05 |
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7 : SULFATES (selenates, tellurates, chromates, molybdates,
wolframates) G : Molybdates, Wolframates and Niobates A : Without
additional anions or H2O
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Related
to: |
Scheelite Group.
Scheelite - Wulfenite Series. The tetragonal dimorph of Raspite.
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Crystal
Data
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Crystallography:
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Tetragonal
- Dipyramidal
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Crystal
Habit:
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Crystals
are commonly dipyramidal {111}, {101}, with {011}, {112},
{001}, complex development with over 30 other forms
recorded; may be flat tabular {001}, {101}, to 6 cm.
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Twinning:
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None
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Physical
Properties
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Cleavage: |
[001]
Indistinct, [011] Imperfect
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Fracture: |
Irregular/Uneven,
Conchoidal
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Tenacity:
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Brittle
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Hardness
(Mohs): |
2.5
- 3.0
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Density:
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7.90
- 8.34 (g/cm3)
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Luminescence:
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May be bright red to red-orange (LW UV), and lemon-yellow (SW UV). |
Radioactivity:
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Not
Radioactive
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Other: |
Melting Point 1123° C
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Optical
Properties
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Color: |
Reddish
brown, Brown, Yellowish Gray, Smoky Gray, Straw-Yellow,
Lemon-Yellow; may be Green, Orange, Red
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Transparency: |
Transparent
to Translucent |
Luster: |
Sub-Adamantine,
Resinous |
Refractive
Index: |
2.19
- 2.27
Uniaxial ( - )
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Birefringence: |
0.080
- 0.090
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Pleochroism: |
None |
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Occurances
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Geological
Setting: |
An
uncommon mineral in the oxidized zone of hydrothermal
tungsten-bearing lead deposits. |
Common
Associations: |
Anglesite,
Cerussite, Mimetite, Pyromorphite, Raspite, |
Common
Impurities: |
Mo |
Type
Locality: |
Cínovec / Zinnwald (Cinvald), Erzgebirge; Krusné Hory
Mts, Saxony & Ústí Region (Bohemia; Böhmen; Boehmen), Germany & Czech
Republic |
Year
Discovered: |
1845
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View
mineral photos: |
Stolzite
Mineral Photos and Locations |
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More
Information
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Mindat.org Webmineral.com |
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Stolzite
is a very rare sulfate mineral and an extremely rare
gem. It is a very heavy mineral with a density of about
8.0 (g/cm3) and has a very high refractive
index of 2.19 - 2.27 and an adamantine to resinous luster
but is very soft with a Mohs hardness of 2.5 - 3.0.
Stolzite
is found at many localities in small amounts but
very few localities produce crystals large enough for
faceting. The few locations that might produce gem quality crystals
are the Sainte-Lucie mine, Saint-Léger de Peyre, Lozére,
France; fine examples from Broken Hill, New South Wales,
Australia; large crystals from Tsumeb, Namibia. In the
USA, large crystals at the Fat Jack mine, Bradshaw Mountains,
Yavapai County, Arizona.
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Stolzite
gems for sale:
We
have not photographed our Stolzite gems. Please
check back soon.
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