Discussions

💬 Home 🔎 Search 📅 Latest

╳Discussions

💬 Home 🔎 Search 📅 Latest

Groups

Recent Images in Discussions

Mineralogical ClassificationMineralogy, crystallography and structural complexity of natural uranyl silicates

28th Nov 2018 13:21 UTCMarco E. Ciriotti Manager

Reference:

▪ Plášil, J. (2018): Mineralogy, Crystallography and Structural Complexity of Natural Uranyl Silicates. Minerals, 8, 551; https://doi.org/10.3390/min8120551

Abstract:

Naturally occurring uranyl silicates are common constituents of the oxidized parts (i.e., supergene zone) of various types of uranium deposits. Their abundance reflects the widespread distribution of Si4+ in the Earth’s crust and, therefore, in groundwaters. Up to date, 16 uranyl silicate minerals are known. Noteworthy is that the natural uranyl silicates are not extremely diverse regarding their crystal structures; it is a result of possible concentrations (activity) of Si4+ in aqueous solutions derived from dissolution of primary Si minerals or the composition of late hydrothermal fluids. Therefore, in natural systems, we distinguish in fact among two groups of uranyl silicate minerals: uranophane and weeksite-group. They differ in U:Si ratio (uranophane, 1:1; weeksite, 2:5) and they form under different conditions, reflected in distinctive mineral associations. An overview of crystal-chemistry is provided in this paper, along with the new structure data for few members of the uranophane group. Calculations of the structural complexity parameters for natural uranyl silicates are commented about as well as other groups of uranyl minerals; these calculations are also presented from the point of view of the mineral paragenesis and associations.

NdR: In the paper structural refinements of:

Sklodowskite C2/m 17.4078(6), 7.0428(3), 6.6080(2) 90, 105.882(14), 90

Cuprosklodowskite P-1 6.6549(5), 7.0573(4), 9.2344(8) 70.429(6), 70.945(7), 89.850(5)

Oursinite Cmce 7.0457(4), 17.5445(8), 12.7231(2) 90, 90, 90

Soddyite Fddd 8.3097(3), 11.2205(4), 18.6576(11) 90, 90, 90

28th Nov 2018 15:24 UTCRichard Gunter Expert

For some reason your doi.org link cannot be found by my computer.

28th Nov 2018 15:52 UTCAlan Pribula

Nor by mine.

28th Nov 2018 15:57 UTCJolyon Ralph Founder

Marco added an extra dot on the end of the DOI which breaks it, remove the dot and the DOI works

28th Nov 2018 17:08 UTCWayne Corwin

Fixed

28th Nov 2018 17:36 UTCUwe Kolitsch Manager

Added to the four mineral pages.

28th Nov 2018 19:41 UTCRichard Gunter Expert

Thanks. It works now.

Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 26, 2024 20:58:06

Go to top of page