Alunite supergroup: recommended nomenclature
نویسندگان
چکیده
Minamiite has been discredited and renamed natroalunite-2c to show a double unit-cell structure and natroalunite can be designated as natroalunite-1c to show a single unit-cell structure. Kintoreite can be designated as kintoreite-1c to show the same single unit-cell structure, and IMA 1993-039 is a new superstructure of kintoreite and can be designated as kintoreite-2c to show a double unit-cell structure. Beaverite has been renamed beaverite-(Cu). The Zn-bearing beaverite of Sato et al. (2008) has been named ‘‘beaverite-(Zn)’’, but data for the mineral have not been approved by the CNMNC. Orpheite has been discredited as P-rich hinsdalite. Proposal 07-D was approved by the CNMNC.
منابع مشابه
Use of Raman spectroscopy to characterize and distinguish minerals of the alunite supergroup
The alunite supergroup consists of more than 50 representative minerals with the general formula A B 3 (XO 4) 2 (OH) 6 , where A may be occupied by Na, is the trivalent cation , Al 3+ or Fe 3+ , but also Cu 2+ or Zn 2+ and X is the tetrahedral anion, S, P or As [1, 2]. The minerals of this supergroup form numerous complex solid solutions which crystallize in a rhombohedral system, space group R...
متن کاملRecommended nomenclature for the sapphirine and surinamite groups (sapphirine supergroup)
Minerals isostructural with sapphirine-1A, sapphirine-2M, and surinamite are closely related chain silicates that pose nomenclature problems because of the large number of sites and potential constituents, including several (Be, B, As, Sb) that are rare or absent in other chain silicates. Our recommended nomenclature for the sapphirine group (formerly aenigmatite group) makes extensive use of p...
متن کاملCrystallization of Jarosite with Variable Al3+ Content: The Transition to Alunite
This study focused on the formation of the jarosite-alunite solid solution at relatively low temperature, 90 ◦C. It was found that the transition from jarosite to alunite results in significant changes in the powder X-ray diffraction pattern, the infrared spectrum and thermal behavior when the degree of substitution reached ≥50%. The initial Al/(Al + Fe) in solution, however, required to achiev...
متن کاملComparison of Band Ratioing and Spectral Indices Methods for Detecting Alunite and Kaolinite Minerals Using Aster Data in Biga Region, Turkey
Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) covers a wide spectral region with 14 bands from visible to the thermal infrared. The different band ranges can be capable of discriminating and mapping surface rocks and predicting pathfinder minerals (i.e. alunite, kaolinite etc.) on alteration assemblages of potential targets. The aim of this study is to compare two diffe...
متن کاملThermal investigations on alunite and its mixtures with quartz and dickite
The thermal decomposition of alunite and of mixtures of alunite with dickite or quartz or both has been studied, and X-ray determinations of the products at various stages of the decomposition have been made. Between 6oo and 7oo ~ the product from alunite is a mixture of anhydrous alum and amorphous alumina; between 7oo and 770 ~ the anhydrous alum breaks down into aluminium sulphate and alkali...
متن کامل