Symmetry and twinning in boltwoodite
The authors give the results of an x-ray diffraction and chemical analysis of boltwoodite from Namibia. Chemical analysis revealed that as well as potassium there was a considerable amount of sodium; thus one may speak of sodium boltwoodite with the molecular ratio K/sub 2/O:Na/sub 2/O = 2 : 1. The potassium and sodium are partly replaced by H/sub 3/O. The idealized formula is (K,Na)/sub 2-x/(H/sub 2/O)/sub x/ x (UO/sub 2/SiO/sub 4/) x H/sub 2/O; the symmetry is monoclinic, the space group being C/sup 2//sub 2h/ = P2/sub 1//m, with a = 6.65 A, b = 7.07 A, c = 7.11 A, ..beta.. = 105/sup 0/30', Z = 2. The acicular crystals are elongated along (010) with a very pronounced cleavage in 001. The cleavage plane is (101). The mineral bears a very marked resemblance to kasolite.
- Research Organization:
- Institute of Mineralogy and Crystallography, Technical University of West Berlin
- OSTI ID:
- 5577820
- Journal Information:
- Sov. Phys. - Crystallogr. (Engl. Transl.); (United States), Vol. 26:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BOLTWOODITE
CHEMICAL ANALYSIS
CRYSTAL STRUCTURE
TWINNING
X-RAY DIFFRACTION
SOUTH WEST AFRICA
ACTINIDE COMPOUNDS
AFRICA
ALKALI METAL COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
MATERIALS
MINERALS
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM SILICATES
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
SCATTERING
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SOUTH AFRICA
URANIUM COMPOUNDS
URANIUM MINERALS
URANIUM SILICATES
580400* - Geochemistry- (-1989)