1-20 OF 36 RESULTS FOR

trolleite

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 01 December 1979
American Mineralogist (1979) 64 (11-12): 1175–1183.
...J. D. Bass; C. B. Sclar Abstract The univariant reaction Al 4 ( PO ) 3 ( OH ) 3 ( trolleite ) ⇄ 3 AlPO 4 ( berlinite ) + 1 2 Al 2 O 3 + 3 / 2 ⁢ H 2 O has been investigated at pressures between P H 2 O = 10.0 and 23.0 kbar using a piston–cylinder apparatus, and below P H 2 O = 5.0 kbar using...
Journal Article
Published: 01 October 1974
American Mineralogist (1974) 59 (9-10): 974–984.
...Paul Brian Moore; Takaharu Araki Abstract Trolleite, 4Al 4 (OH) 3 [PO 4 ] 3 , a 18.894(5) Å, b 7.161(1) Å, c 7.162 (2)Å, β 99.99(2)°, space group I 2/ c , is a valid species. For 2010 independent reflections, R ( hkl ) converged to 0.036. Estimated standard errors in distances are Me-O ± 0.002 Å...
Journal Article
Published: 01 June 1976
American Mineralogist (1976) 61 (5-6): 409–413.
...W. S. Wise; S. E. Loh Abstract Using standard hydrothermal techniques, the phase relations of three Al-phosphate minerals—berlinite, AlP0 4 ; augelite, Al 2 P0 4 (0H) 3 ; and trolleite, Al 4 (P0 4 ) 3 (0H) 3 —were determined in the temperature and pressure range of 400° to 600°C and 500 to 3000...
Journal Article
Published: 01 October 2007
American Mineralogist (2007) 92 (10): 1695–1703.
..., at low concentrations of P in the fluid, because berlinite breaks down at lower temperature to augelite [Al 2 PO 4 (OH) 3 ] + H 3 PO 4 + H 2 O and trolleite [Al 4 (PO 4 ) 3 (OH) 3 ] + H 3 PO 4 + H 2 O. The variscite/metavariscite = berlinite equilibrium has been investigated by synthesis experiments from...
FIGURES | View All (5)
Journal Article
Published: 01 February 2004
Mineralogical Magazine (2004) 68 (1): 123–134.
... either derived from low-temperature adiabatic calorimetry or experimental phase equilibria under pressure and temperature, were computed to retrieve a (S–V)P 2 O 5 value of 57.4(2.9) to predict phosphate entropies from oxide summation. The predicted third-law entropy for trolleite, Al 4 (PO 4 ) 3 (OH) 3...
FIGURES | View All (6)
Image
Retrieval of new  S  0  298  and ΔH f,298  values for <b>trolleite</b> and recalcu...
Published: 01 February 2004
F ig . 6. Retrieval of new S 0 298 and ΔH f,298 values for trolleite and recalculation of the location in the P-T space of the trolleite dehydration curve, trolleite = berlinite + corundum + water. The dashed line is the reaction calculated by Brunet and Chopin (1995) . Brackets
Image
The crystal structures of <b>trolleite</b>, seamanite and holtedahlite: (a) trolle...
Published: 01 January 2002
Figure 55. The crystal structures of trolleite, seamanite and holtedahlite: (a) trolleite projected onto (010); (b) trolleite projected onto (100); (Alϕ 6 ) octahedra are 4 4 -net-shaded; (c) seamanite projected onto (100); (d) seamanite projected onto (001); (Mn 2+ ϕ 6 ) octahedra are 4 4 -net
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2423(29)
... on this information, the mechanism of aluminum phosphate genesis in the protolith of the metaquartzites and the behavior of phosphates (lazulite, augelite, trolleite, svanbergite, goyazite-crandallite, berlinite, and xenotime) during low-grade amphibolite-facies metamorphism is discussed. In Precambrian marine...
Journal Article
Published: 01 September 2005
European Journal of Mineralogy (2005) 17 (5): 749–759.
... 3 mm, embedded in scorzalite. Associated phosphate minerals are scorzalite, trolleite, montebrasite, bertossaite, brazilianite, with accessory augelite, triplite and lacroixite. The mineral is transparent and exhibits a dark-green to bronze colour, with a resinous lustre and with a greenish...
FIGURES | View All (7)
Image
Phase relations in the system Al 2 O 3 -P 2 O 5 -H 2 O at a temperature of ...
Published: 01 October 2007
) of the system are speculative and the ternary field of hydrous phosphorous solution is highly schematic. The phase relations show that berlinite + H 2 O must react to trolleite + solution (or augelite, corundum, or diaspore), with decreasing concentration of phosphoric acid in the solution.
Image
Mössbauer spectra and Fe coordination polyhedra, with conventions as in  Fi...
Published: 01 May 2014
( Rea and Kostiner 1972 ) DD129 and DD309 samples contain Fe 2+ in both M1 and M2, and wagnerite ( Tadini 1981 ) DD330, also from the triplite-triplodite group, is similar. Trolleite DD157 has two doublets with the same Δ but different δ; the Al2 site has the lower δ. Chalcosiderite ML-P39, a member
Image
The ternary system Al 2 O 3 -P 2 O 5 -H 2 O with position of minerals and s...
Published: 01 October 2007
-variscite-1:1:6–1:1:7-water, 1:2:0–1:2:4–1:2:5–1:2:8:1:2:9-water, 1:3:0–1:3:5–1:3:6-water, berlinite-trolleite-augelite-boehmite, diaspor-senegalite-variscite-phophoric acid, and gibbsite-vantasselite-1:1:6–1:2:9-phosphoric acid
Image
Vein textures of Cerro la Mina. A/B. A Stage 1 pyrite vein has infilled an ...
Published: 01 June 2017
= marcasite, Mo = molybdenite, Musc = muscovite, Pla = planerite, Py = pyrite, Qtz = quartz, S = stage, Sph = sphalerite, Tro = trolleite.
Image
SEM images of run products (run no. indicated at lower left). ( a ) Euhedra...
Published: 01 October 2007
with a thin coating of an amorphous quench phase. ( c ) Polished section of the run products showing berlinite as a stable phase, embedded in an amorphous Al-P-O-H phase (dark gray) with well-developed shrinkage cracks. ( d ) Ledge-shaped augelite (Aug) next to tabular trolleite (Tro). ( e ) Spherical grain
Journal Article
Published: 01 August 2003
American Mineralogist (2003) 88 (8-9): 1395–1397.
... close to those determined for the natural berlinite sample. R eference cited Bass, J.D. and Sclar, C.B. ( 1979 ) The stability of trolleite and the Al 2 O 3 -AlPO 4 -H 2 O phase diagram. American Mineralogist , 64 , 1175 –1183. Blomstrand, C.W. ( 1868 ) Om Westanå Mineralier. Öfversigt...
FIGURES
Journal Article
Published: 01 August 2007
American Mineralogist (2007) 92 (8-9): 1518–1524.
... specimens are necessary to clarify the relationship between these two minerals. Face-sharing octahedral dimers have been previously reported in the structures of five phosphate minerals: trolleite ( Moore and Araki 1974 ), holtedahlite ( Rømming and Raade 1989 ), raadeite ( Chopin et al. 2001...
FIGURES | View All (4)
Journal Article
Published: 01 October 2009
The Canadian Mineralogist (2009) 47 (5): 1213–1223.
... wyllieite as a product of the secondary alteration of montebrasite. Fransolet (1995) interpreted the rosemaryite from the Buranga pegmatite, associated with secondary phosphates such as trolleite, as possibly originating by the oxidation of wyllieite. Likewise, Hatert et al. (2005) described...
FIGURES | View All (4)
Journal Article
Published: 01 May 2014
American Mineralogist (2014) 99 (5-6): 914–942.
... ( Rea and Kostiner 1972 ) DD129 and DD309 samples contain Fe 2+ in both M1 and M2, and wagnerite ( Tadini 1981 ) DD330, also from the triplite-triplodite group, is similar. Trolleite DD157 has two doublets with the same Δ but different δ; the Al2 site has the lower δ. Chalcosiderite ML-P39, a member...
FIGURES | View All (13)
Journal Article
Journal: Economic Geology
Published: 01 May 2007
Economic Geology (2007) 102 (3): 495–509.
... of 47 samples, including samples from Woods Mountain. Mitchell and Fordham (1987) reported trolleite and lazulite at Willis Mountain, and we found lazulite in sample 21 from Blue Rock Road. A number of additional rare minerals have been reported in these rocks, particularly from Willis Mountain...
FIGURES | View All (6)
Journal Article
Published: 01 August 2012
The Canadian Mineralogist (2012) 50 (4): 933–942.
... become unstable and are replaced by trolleite; at T higher than ~500°C, the stable association is berlinite + corundum + vapor. In addition, Drüppel et al. (2007) showed experimentally that in the same system below 200°C, the stable phases are variscite and metavariscite, minerals that are absent...
FIGURES | View All (6)