Fluorphosphohedyphane, Ca2Pb3(PO4)3F, the first apatite supergroup mineral with essential Pb and F
-
Anthony R. Kampf
and
Robert M. Housley
Abstract
The new mineral fluorphosphohedyphane, Ca2Pb3(PO4)3F, the F-analog of phosphohedyphane, is hexagonal with space group P63/m and cell parameters a = 9.6402(12), c = 7.0121(8) Å, V = 564.4(1) Å3, and Z = 2. It occurs in the oxidation zone of a small Pb-Cu-Zn-Ag deposit, the Blue Bell claims, about 11 km west of Baker, San Bernardino County, California. It forms as sub-parallel intergrowths and irregular clusters of transparent, colorless, highly lustrous, hexagonal prisms with pyramidal terminations. It is found in cracks and narrow veins in a highly siliceous hornfels in association with cerussite, chrysocolla, fluorite, fluorapatite, goethite, gypsum, mimetite, opal, phosphohedyphane, plumbogummite, plumbophyllite, plumbotsumite, pyromorphite, quartz, and wulfenite. The streak of the new mineral is white, the luster is subadamantine, and the Mohs hardness is about 4. The mineral is brittle with subconcoidal fracture and no cleavage. The calculated density is 5.445 g/cm3 based upon the empirical formula. Optical properties (589 nm): uniaxial (-), ω = 1.836(5), ε = 1.824(5), nonpleochroic. SEM-EDS analyses yielded the averages and ranges in wt%: O 21.28 (20.31-22.14), F 1.59 (1.38-1.91), P 10.33 (9.81-10.83), Ca 9.66 (8.97-10.67), Pb 60.08 (57.67-61.21), total 102.95 (102.02-103.88), providing the empirical formula (based on P = 3): Ca2.00(Pb2.61Ca0.17)Σ2.78P3O11.91F0.75. Infrared spectroscopy showed no evidence of OH or carbonate. The strongest powder X-ray diffraction lines are [d(hkl)I]: 8.38(100)22, 3.974(111)28, 3.506(002)25, 2.877(121,211)100, 1.878(213,123)26. Fluorphosphohedyphane has the apatite structure (R1 = 1.75% for 444 reflections with Fo > 4σF) with ordering of Ca and Pb in two cation sites, as in hedyphane and phosphohedyphane. The Pb2+ cation exhibits a stereoactive 6s2 lone-electron-pair. The X anion site at (0, 0, ½) is fully occupied by F forming six bonds of 2.867 Å to Pb atoms, in contrast to the six Pb-Cl bonds of 3.068 Å in phosphohedyphane
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Paulscherrerite from the Number 2 Workings, Mount Painter Inlier, Northern Flinders Ranges, South Australia: “Dehydrated schoepite” is a mineral after all
- Atomistic investigation of the pyrophyllitic substitution and implications on clay stability
- Application of the two-feldspar geothermometer to ultrahigh-temperature (UHT) rocks in the Khondalite belt, North China craton and its implications
- Wüstite in a hydrothermal silver-lead-zinc vein, Lucky Friday mine, Coeur d’Alene mining district, U.S.A.
- Gelosaite, BiMo6+(2–5x)Mo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4), a new mineral from Su Senargiu (CA), Sardinia, Italy, and a second occurrence from Kingsgate, New England, Australia
- Improved electron probe microanalysis of trace elements in quartz
- Ultra-high residual compressive stress (>2 GPa) in a very small volume (<1 μm3) of indented quartz
- Transmission electron microscopy investigation of Ag-free lillianite and heyrovskýite from Vulcano, Aeolian Islands, Italy
- Combined inelastic neutron scattering and solid-state density functional theory study of dynamics of hydrogen atoms in muscovite 2M1
- Contact metamorphism of a Cretaceous accretionary prism by the 14 Ma Okueyama granite, a single post-kinematic pluton in Central Kyushu, Japan: SVD analysis of metamorphic reactions and thermal release
- Origin of crosscutting dissolution surfaces in magmatic plagioclase
- Néel transition in (Mg,Fe)O: A possible change of magnetic structure
- Extreme channelization of fluid and the problem of element mobility during Barrovian metamorphism
- The high-temperature P21/m → C2/m phase transitions in synthetic amphiboles along the richterite–(BMg)–richterite join
- The crystal structure of barite, BaSO4, at high pressure
- Thermal decomposition of brushite, CaHPO4·2H2O to monetite CaHPO4 and the formation of an amorphous phase
- Rhombic-shaped nanodomains in columbite driven by contrasting cation order
- High-pressure structural evolution and equation of state of analbite
- In-situ dehydration studies of fully K-, Rb-, and Cs-exchanged natrolites
- The crystal structures and Raman spectra of aravaipaite and calcioaravaipaite
- Temperature dependence of the Fe2+ Mössbauer parameters in triphylite (LiFePO4)
- Synthesis and characterization of françoisite-(Nd): Nd[(UO2)3O(OH)(PO4)2]·6H2O
- Fluorphosphohedyphane, Ca2Pb3(PO4)3F, the first apatite supergroup mineral with essential Pb and F
- A new mineral with an olivine structure and pyroxene composition in the shock-induced melt veins of Tenham L6 chondrite
- The WURM project—a freely available web-based repository of computed physical data for minerals
- Acid production by FeSO4·nH2O dissolution: Comment
- Letter. Crystal chemistry of sodium in the Earth’s interior: The structure of Na2MgSi5O12 synthesized at 17.5 GPa and 1700 °C
- Letter. In-situ infrared spectra of OH in olivine to 1100°C
Articles in the same Issue
- Paulscherrerite from the Number 2 Workings, Mount Painter Inlier, Northern Flinders Ranges, South Australia: “Dehydrated schoepite” is a mineral after all
- Atomistic investigation of the pyrophyllitic substitution and implications on clay stability
- Application of the two-feldspar geothermometer to ultrahigh-temperature (UHT) rocks in the Khondalite belt, North China craton and its implications
- Wüstite in a hydrothermal silver-lead-zinc vein, Lucky Friday mine, Coeur d’Alene mining district, U.S.A.
- Gelosaite, BiMo6+(2–5x)Mo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4), a new mineral from Su Senargiu (CA), Sardinia, Italy, and a second occurrence from Kingsgate, New England, Australia
- Improved electron probe microanalysis of trace elements in quartz
- Ultra-high residual compressive stress (>2 GPa) in a very small volume (<1 μm3) of indented quartz
- Transmission electron microscopy investigation of Ag-free lillianite and heyrovskýite from Vulcano, Aeolian Islands, Italy
- Combined inelastic neutron scattering and solid-state density functional theory study of dynamics of hydrogen atoms in muscovite 2M1
- Contact metamorphism of a Cretaceous accretionary prism by the 14 Ma Okueyama granite, a single post-kinematic pluton in Central Kyushu, Japan: SVD analysis of metamorphic reactions and thermal release
- Origin of crosscutting dissolution surfaces in magmatic plagioclase
- Néel transition in (Mg,Fe)O: A possible change of magnetic structure
- Extreme channelization of fluid and the problem of element mobility during Barrovian metamorphism
- The high-temperature P21/m → C2/m phase transitions in synthetic amphiboles along the richterite–(BMg)–richterite join
- The crystal structure of barite, BaSO4, at high pressure
- Thermal decomposition of brushite, CaHPO4·2H2O to monetite CaHPO4 and the formation of an amorphous phase
- Rhombic-shaped nanodomains in columbite driven by contrasting cation order
- High-pressure structural evolution and equation of state of analbite
- In-situ dehydration studies of fully K-, Rb-, and Cs-exchanged natrolites
- The crystal structures and Raman spectra of aravaipaite and calcioaravaipaite
- Temperature dependence of the Fe2+ Mössbauer parameters in triphylite (LiFePO4)
- Synthesis and characterization of françoisite-(Nd): Nd[(UO2)3O(OH)(PO4)2]·6H2O
- Fluorphosphohedyphane, Ca2Pb3(PO4)3F, the first apatite supergroup mineral with essential Pb and F
- A new mineral with an olivine structure and pyroxene composition in the shock-induced melt veins of Tenham L6 chondrite
- The WURM project—a freely available web-based repository of computed physical data for minerals
- Acid production by FeSO4·nH2O dissolution: Comment
- Letter. Crystal chemistry of sodium in the Earth’s interior: The structure of Na2MgSi5O12 synthesized at 17.5 GPa and 1700 °C
- Letter. In-situ infrared spectra of OH in olivine to 1100°C
