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First reported sedimentary occurrence of berlinite (AlPO4) in phosphate-bearing sediments from Cioclovina Cave, Romania
-
Bogdan P. Onac
und
William B. White
Veröffentlicht/Copyright:
31. März 2015
Abstract
This paper describes the first reported occurrence of berlinite (AlPO4) formed entirely under sedimentary conditions. Berlinite appears as grayish or colorless fine crystals in vacuoles and along cracks in heavily compacted, phosphate-rich sediments within the Cioclovina Cave in Romania. The X-ray powder diffraction pattern and the hexagonal unit-cell of the Cioclovina berlinite specimen compare well with other published determinations. The lattice parameters are a = 4.94(4), c = 10.87(1) Å, V = 230.1(3) Å3. Microprobe analyses confirmed a nearly ideal formula for berlinite. In situ guano combustion is responsible for the transformation of taranakite and for the dehydration of variscite into berlinite. Berlinite was successfully synthesized from these two minerals at atmospheric pressure and temperatures ranging from 350 to 600°C
Received: 2003-2-13
Accepted: 2003-4-21
Published Online: 2015-3-31
Published in Print: 2003-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- Melting of garnet peridotite: Effects of capsules and thermocouples, and implications for the high-pressure mantle solidus
- High-resolution and energy-filtered TEM of the interface between hematite and ilmenite exsolution lamellae: Relevance to the origin of lamellar magnetism
- The structural evolution of mercury sulfide precipitate: an XAS and XRD study
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- Fluid-induced nucleation of (Y+REE)-phosphate minerals within apatite: Nature and experiment. Part II. Fluorapatite
- A technique for measuring 3D crystal-size distributions of prismatic microlites in obsidian
- TEM investigation of forsterite dendrites
- Mechanism and kinetics of element and isotopic exchange mediated by a fluid phase
- Chromian spinel during melting experiments of dry peridotite (KLB-1) at 1.0–2.5 GPa
- Resonant XPS study of the pyrite valence band with implications for molecular orbital contributions
- Petrology and mineralogy of wollastonite- and melilite-bearing paralavas from the Central Apennines, Italy
- Variation of antiphase domain size in omphacite: A tool to determine the temperature–time history of eclogites revisited
- Compressional and shear wave velocities of ringwoodite γ-Mg2SiO4 to 12 GPa
- A vibrational spectroscopic study of the oxidation of pyrite by ferric iron
- The atomic arrangement of the ganophyllite-group modulated layer silicates as determined from the orthorhombic dimorph of tamaite, with the elusive 16.8 Å ganophyllite-group superstructure revealed
- The crystal structure of chromian kassite from the Saranovskoye deposit, Northern Urals, Russia
- Spectroscopic and related evidence on the coloring and constitution of New Zealand jade
- Chemical speciation of Ag in galena by EPR spectroscopy
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