Bibliographic Citation
| Document | For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field. For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability. |
|---|---|
| Title | Uranosilite, a new mineral from the uranium deposit at Menzenschwand (Southern Black Forest) |
| Creator/Author | Walenta, K. |
| Publication Date | 1983 Jun 01 |
| OSTI Identifier | OSTI ID: 5064951 |
| Other Number(s) | Journal ID: CODEN: NJMMA |
| Resource Type | Journal Article |
| Resource Relation | Journal Name: Neues Jahrb. Mineral., Monatsh.; (Germany, Federal Republic of); Journal Volume: 6 |
| Subject | 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 58 GEOSCIENCES; URANIUM MINERALS; PHYSICAL PROPERTIES; CHEMICAL COMPOSITION; FEDERAL REPUBLIC OF GERMANY; URANIUM RESERVES; EUROPE; MATERIALS; MINERALS; RADIOACTIVE MATERIALS; RADIOACTIVE MINERALS; RESERVES; RESOURCES; WESTERN EUROPE |
| Description/Abstract | Uranosilite belongs to the secondary assemblage of the uranium deposit at Menzenschwand in the Black Forest (Germany). It occurs in intimate intergrowth with sudtite and uranophane on quartz and hematite and was first mentioned as an unnamed presumably new species in a paper on studtite. The new mineral forms needle-like crystals of orthorhombic symmetry. Forms (pinacoids and prisms) are visible only by electron microscope with a yellowish white colour. The mineral is characterized by vitrous luster; no cleavage, in determinable hardness; Dsub(x) 3.25 g/cm/sup 3/; optical properties: nsub(..cap alpha..) 1.570 +- 0.002, nsub(..gamma..) 1.584 +- 0.002, elongation (+), probably biaxial negative; slightly anomalous interference colours; unitcell dimensions: a/sub 0/ 11.60, b/sub 0/ 14,68, c/sub 0/ 12.83 A, Z = 6, possible space groups P22/sub 1/2/sub 1/, Pmmb, Pmcb; strongest lines of the powder pattern: 11.58 (9) 100; 7.30 (10) 020; 6.19 (9) 120; 3.50 (8) 123, 140. Result of analysis is: U 31.0, Pb 1.5, K 1.2, Si 28.5, O 38.0, total 100.2% yielding the formula (UO/sub 3/)sub(0.95)(PbO)sub(0.05) (K/sub 2/O)sub(0.10)x7SiO/sub 2/ or simplified UO/sub 3/x7SiO/sub 2/ on the basis of O = 17. The lattice is stable up to 900/sup 0/C. Heating to this temperature, however, is accompanied by a decrease in the indices of refraction which may be explained by the loss of (zeolitic) water in the order of 1H/sub 2/O (per formula unit). |
| Country of Publication | Germany |
| Language | German |
| Format | Medium: X; Size: Pages: 259-269 |
| System Entry Date | 2009 Dec 16 |
Top | |