Wulfenite and Baryte
| ID | 527 | |
|---|---|---|
| Mineral |
Wulfenite
Baryte |
|
| Location | Mibladen - Draa-Tafilalet - Morocco | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Wulfenite information at mindat.org View Baryte information at mindat.org |
|
Mindat data
| ID | 4322 |
|---|---|
| Long ID | 1:1:4322:5 |
| Formula |
PbMoO4
|
| IMA Status |
0 1 |
| Other Occurrences | Secondary mineral in weathering zone of lead deposits. |
| Discovery Year | 1845 |
| Diapheny | Transparent,Translucent,Opaque |
| Cleavage | Distinct on {011}; indistinct on {001}, {013}. |
| Tenacity | brittle |
| Colour | Orange-yellow, yellow, honey-yellow, reddish-orange, rarely colourless, grey, brown, olive-green and even black. |
| Hardness (min) | 2.5 |
| Hardness (max) | 3.0 |
| Lustre | Resinous, Adamantine |
| About the name | Renamed in 1845 by Wilhelm Karl von Haidinger in honor of Franz Xaver Freiherr von Wulfen [November 5, 1728, Belgrade, Serbia - March 16, 1805, Klagenfurt, Austria], botanist, mineralogist, alpinist and a member of the Order of the Society of Jesus (Jesuit). Wulfen authored a monograph on the lead ores of Bleiberg, Austria. This mineral was originally named "plumbum spatosum flavo-rubrum, ex Annaberg, Austria" in 1772 by Ignaz von Born. In 1781, Joseph Franz Edler von Jacquin called the mineral "Kärntherischer bleispath". Other names were later proposed. |
| Streak | White |
| Crystal System | Tetragonal |
| Cleavage Type | Distinct/Good |
| Fracture type | Irregular/Uneven,Sub-Conchoidal |
| Morphology | Crystals commonly thin tabular {001}, square, exhibiting {001}, with flat or rounded vicinal faces, {010}; may be elongated [001], or pyramidal {011}, with the pyramid truncating or replacing {001}; more rarely pseudo-octahedral; and very rarely either cubic or short prismatic pyramidal. Commonly exhibits additional forms, some exhibiting pyramidal hemihedrism; granular, massive. |
| Twinning | Twinning on {001} as contact twins; common but rarely seen due to the typical {001} morphology. |
| UV | Fluorescence noted from a small number of localities. Medium intensity Yellow in LW |
| Thermal Behaviour | Melting point 1065°C. |
| key_elements |
0 1 |
| shortcode_ima | Wul |
| Group | Scheelite Group |
| ID | 549 |
|---|---|
| Long ID | 1:1:549:0 |
| Formula |
Ba(SO4)
|
| IMA Status |
0 1 |
| Other Occurrences | Commonly found as a gangue mineral in metallic ore deposits of epithermal or mesothermal origin; but it may also be found as lenses or replacement deposits in sedimentary rocks, both of hypogene and supergene origin. |
| Industrial | Used as an additive in drilling fluids, as a white pigment, e. g. in cosmetic products and in paints, and as a filling material for polymers and papers, high contrast medium for medical X-rays. Also the main source of barium. |
| Diapheny | Transparent,Translucent,Opaque |
| Cleavage | Perfect on {001}; less so on {210}; Imperfect on {010}. |
| Tenacity | brittle |
| Colour | Colourless, white, yellow, brown, grey, blue, etc.; colourless in transmitted light (also tinted yellow, brown, green, blue, etc.) |
| Hardness (min) | 3.0 |
| Hardness (max) | 3.0 |
| Luminescence | Fluoresces yellows, orange, or pink in LW; phophsphoresces strongly greenish-white. |
| Lustre | Vitreous to Resinous, Pearly on cleavage surfaces. |
| About the name | Named in 1800 by Dietrich Ludwig Gustav Karsten from the Greek βαρύς, heavy, due to its unusual heaviness for a non-metallic mineral. |
| Streak | white |
| Crystal System | Orthorhombic |
| Cleavage Type | Perfect |
| Fracture type | Irregular/Uneven |
| Morphology | Usually thin to thick tabular {001}, bounded by {210} alone or in combination with {101}, {011} or other forms. Also flattened {001}, and elongated to prismatic [010] or [100]. More rarely prismatic [001], or equant. Often as aggregates or clusters of tabular crystals with edges projecting into crest-like forms, or as rosettes. Also found as massive material, compact, laminated or concretionary; and in fibrous, stalactic, and earthy masses. |
| UV | Shades of yellow, occasionally orange or pink (LW UV). Shades of yellow, white (Franklin & Sterling Hill, NJ). May phosphoresce strongly greenish-white. |
| Thermal Behaviour | Inverts to another (monoclinic?) polymorph when heated to 1149°C. Above 1400°C decomposition to barium oxide, sulphur dioxide and oxygen. Thermoluminescent at times. |
| Comment Luster | Vitreous to Resinous, Pearly on cleavage surfaces. |
| key_elements |
0 |
| shortcode_ima | Brt |
| Group | Baryte Group |
Details
Price: € 15
Dimensions: Not registered
Weight: Not registered
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Ba | Barium | |
| Mo | Molybdenum | |
| O | Oxygen | |
| Pb | Lead |
|
| S | Sulfur |