Torbernite
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| Torbernite | |
|---|---|
| Image:Torbernite.jpg |
|
| General | |
| Category | Mineral |
| Chemical formula | Template:Copper(Template:UraniumO2)2(Template:PhosphorusO4)2Template:Hydrate (hydrated copper uranyl phosphate) |
| Identification | |
| Color | Green |
| Crystal habit | tabular crystals, encrusted |
| Crystal system | Tetragonal |
| Cleavage | [001] Perfect; [100] Distinct |
| Fracture | Brittle |
| Mohs Scale hardness | 2 - 2.5 |
| Luster | Vitreous; Pearly |
| Streak | Pale green |
| Specific gravity | 3.2 |
| Diaphaneity | Transparent to opaque |
| Other Characteristics |  Radioactive |
Torbernite, whose name derives from the Swedish chemist Tornbern Bergmann (1735-1784), is a radioactive, green phosphate mineral, found in granites and other uranium-bearing deposits as a secondary mineral. Torbernite is isostructural with a related uranium mineral, autunite, with torbernite's lack of fluorescence a notable difference.
Torbernite's most common alternative names are copper uranite and cuprouranite.
Uses of torbernite
As a radioactive mineral, torbernite has some significance as an ore of uranium. Its rich color and distinctive crystals make it a sought after collectors mineral, as well. However, torbernite, like other hydrated minerals, suffers from loss of water molecules. This loss of water from the mineral leads to an alteration of all torbernite specimens into its pseudomorph, meta-torbernite. Some collector's sites assert than any torbernite specimen more than a few years old should be considered fully transitioned to meta-torbernite.
As torbernite is radioactive, collectors are urged to take proper precautions in the handling and storage of any specimens.
Associated minerals
Torbernite frequently occurs in conjunction with other uranium minerals, as well as host rock minerals. These associated minerals include:
- autunite, Template:Calcium(Template:UraniumO2)2(Template:PhosphorusO4)2Template:Hydrate
- uraninite, Template:UraniumO2
- uranophane, Template:Calcium}}(Template:UraniumO2)2Si2O7Template:Hydrate
- uranocircite, Template:Barium(Template:UraniumO2)2(Template:PhosphorusO4)2Template:Hydrate
- topaz, Template:Aluminum[(Template:Fluorine,Template:Hydroxide)2|SiO4]
Identification
The most obvious factor in identifying torbernite is its radioactivity. However, since it is frequently found in association with other radioactive minerals, this may not be useful in separating one uranium mineral from the rest. A next step would be to check color. Most uranium-bearing minerals are bright yellow or green. As torbernite is exclusively green, this can be a useful secondary fact. Crystal habit is also useful, but as it shares a similar structure and color with autunite, torbernite's lack of fluorescence can distinguish the two. Nonetheless, regardless of identification, it is likely that at least some of the specimen will have already altered to meta-torbernite.
See also
External links
de:Torbernit it:Torbernite nl:Torberniet sk:Torbernit
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
