Konstantin V. Van

Lileyite, Ba2(Na,Fe,Ca)3MgTi2(Si2O7)2O2F2, a new lamprophyllite-group mineral from the Eifel volcanic area, Germany

The new Mg- and F-dominant lamprophyllite-group mineral lileyite (IMA 2011-021) was found at the Lohley quarry, Udersdorf, near Daun, Eifel Mountains, Rhineland-Palatinate (Rheinland-Pfalz), Germany, and named for the old name of the type locality, Liley. Associated minerals are nepheline, leucite, augite, magnetite, fluorapatite, perovskite, gotzenite. Lileyite is brown, translucent; streak is white. It forms platy crystals up to 0.1 × 0.3 × 0.5 mm in size and their clusters up to 1 mm across on the walls of cavities in an alkaline basalt. Lileyite is brittle, with Mohs hardness of 3–4 and perfect cleavage on (001). D calc is 3.776 g/cm 3 . The new mineral is biaxial (+), α = 1.718(5), β = 1.735(5), γ = 1.755(5), 2V (meas.) = 75(15)°, 2V (calc.) = 86°. The IR spectrum is given. The chemical composition is (EDS-mode electron microprobe, mean of 5 analyses, wt%): SiO 2 28.05, BaO 26.39, TiO 2 18.53, Na 2 O 6.75, MgO 4.58, FeO 4.48, CaO 2.30, SrO 2.23, MnO 1.44, K 2 O 1.41, Nb 2 O 5 0.95, F 3.88, –O=F 2 -1.63; total 99.36. The empirical formula based on 18 anions is: Ba 1.50 Sr 0.19 K 0.26 Na 1.89 Ca 0.36 Mn 0.18 Mg 0.99 Fe 0.54 Ti 2.01 Nb 0.06 Si 4.06 O 16.23 F 1.77 . The simplified formula is: Ba 2 (Na,Fe,Ca) 3 MgTi 2 (Si 2 O 7 ) 2 O 2 F 2 . The crystal structure was solved using single-crystal X-ray diffraction data ( R = 0.024). Lileyite is monoclinic, space group C 2/ m , a = 19.905(1), b = 7.098(1), c = 5.405(1) A, β = 96.349(5)°, V = 758.93(6) A 3 , Z = 2. The strongest lines of the powder diffraction pattern [ d , A ( I , %) ( hkl )] are: 3.749 (45) (31–1), 3.464 (76) (510, 311, 401), 3.045 (37) (51–1), 2.792 (100) (221, 511), 2.672 (54) (002, 601, 20-2), 2.624 (43) (710, 42–1). Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4106/1.

Laachite, (Ca,Mn)2Zr2Nb2TiFeO14, a new zirconolite-related mineral from the Eifel volcanic region, Germany

The new mineral laachite was discovered in a sanidinite specimen from the Laach Lake (Laacher See) volcano, Eifel region, Rheinland-Pfalz, Germany. Associated minerals are sanidine, allanite-(Ce), baddeleyite, hauyne, hedenbergite, intermediate members of the jacobsite-magnetite series, phlogopite, rhodonite, spessartine, tephroite, thorite, zircon, and a pyrochlore-group mineral. Laachite is deep brownish-red, has an adamantine lustre, and is translucent; the streak is brownish red. It forms long-prismatic crystals up to 0.02 × 0.04 × 0.5 mm, which are present as random intergrowths and twins in cavities within sanidinite. The density calculated from the empirical formula is 5.417 g/cm 3 . The mean refractive index calculated from the Gladstone-Dale relationship is 2.26. The Raman spectrum shows the absence of hydrogen-bearing groups. The chemical composition is (electron microprobe, mean of 5 analyses, wt. %): CaO 4.29, MnO 9.42, FeO 5.73, Y 2 O 3 2.56, La 2 O 3 2.00, Ce 2 O 3 6.37, Nd 2 O 3 2.22, Al 2 O 3 0.99, ThO 2 7.75, TiO 2 10.98, ZrO 2 19.39, Nb 2 O 5 27.82, total 99.52. The empirical formula based on 14 O atoms is: (Ca 0.66 Mn 0.37 Th 0.25 Y 0.20 La 0.11 Ce 0.34 Nd 0.11 )(Zr 1.36 Mn 0.64 )(Nb 1.81 Ti 1.19 )(Fe 0.69 Al 0.17 Mn 0.14 )O 14.00 . The simplified formula, taking into account the structural data, is: (Ca,Mn) 2 (Zr,Mn) 2 Nb 2 TiFeO 14 . Laachite is monoclinic, space group C 2/ c , a = 7.3119(5), b = 14.1790(10), c = 10.1700(7) A, β = 90.072(2)°, V = 1054.38(1) A 3 , Z = 4. The crystal structure was solved using single-crystal X-ray diffraction data. Laachite is a monoclinic analogue of zirconolite-3 O , CaZrTi 2 O 7 , with Nb dominant over Ti in the octahedral sites Nb 1 and Nb 2 and Fe dominant in a site with four-fold coordination. The strongest lines of the powder X-ray diffraction pattern [ d , A ( I , %) ( hkl )] are: 4.298 (22) (022), 2.967 (100) (20–2, 202), 2.901 (59) (042), 2.551 (32) (15–1, 151, 240, 004), 1.800 (34) (24–4, 244), 1.541 (24) (37–1, 371), 1.535 (23) (20–6, 206), 1.529 (23) (046).

Antipinite, KNa3Cu2(C2O4)4, a new mineral species from a guano deposit at Pabellón de Pica, Chile

Abstract The new oxalate mineral antipinite is found in a guano deposit located on the Pabellón de Pica Mountain, Iquique Province, Tarapacá Region, Chile. Associated minerals are halite, salammoniac, chanabayaite, joanneumite and clays. Antipinite occurs as blue, imperfect, short prismatic crystals up to 0.1 mm × 0.1 mm × 0.15 mm in size, as well as their clusters and random aggregates. The mineral is brittle. Mohs hardness is 2; Dmeas = 2.53(3), Dcalc = 2.549 g cm-3. The infrared spectrum shows the presence of oxalate anions and the absence of absorptions associated with H2O molecules, C-H bonds, CO32-,NO-3 - and OH- ions. Antipinite is optically biaxial (+), α = 1.432(3), β = 1.530(1), γ = 1.698(5), 2Vmeas = 75(10)°, 2Vcalc = 82°. The chemical composition (electron-microprobe data, C measured by gas chromatography of products of ignition at 1200°C, wt.%) is Na2O 15.95, K2O 5.65, CuO 27.34, C2O3 48.64, total 99.58. The empirical formula is K0.96Na2O4Cu2.03(C2.00O4)4 and the idealized formula is KNa3Cu2(C2O4)4. The crystal structure was solved and refined to R = 0.033 based upon 4085 unique reflections with I > 2σ(I ). Antipinite is triclinic, space group P1, a = 7.1574(5), b = 10.7099(8), c = 11.1320(8) Å, α = 113.093(1), β = 101.294(1), γ = 90.335 (1)°, V = 766.51(3) Å3, Z = 2. The strongest reflections of the powder X-ray diffraction pattern [d, Å (I,%) (hkl)] are 5.22 (40) (11̅1), 3.47 (100) (03̅ 2), 3.39 (80) (2̅10), 3.01 (30) (03̅3, 220), 2.543 (40) (122, 03̅ 4, 104), 2.481 (30) (2̅13), 2.315 (30) (14̅3, 3̅ 10), 1.629 (30) (14̅6, 4̅14̅, 2̅43, 1̅60).

Correianevesite, Fe2+Mn22+(PO4)2·3H2O, a new reddingite-group mineral from the Cigana mine, Conselheiro Pena, Minas Gerais, Brazil

Abstract Correianevesite, ideally Fe2+Mn22+(PO4)2·3H2O, is a new reddingite-group mineral approved by the CNMNC (IMA 2013-007). It occurs in a phosphate-rich granite pegmatite that outcrops near the Cigana mine, Conselheiro Pena, Rio Doce valley, Minas Gerais, Brazil. Associated minerals are: triphylite, lithiophilite, frondelite, rockbridgeite, eosphorite, vivianite, fairfieldite, leucophosphite, cyrilovite, phosphosiderite, etc. Correianevesite occurs as grayish-brown to reddish-brown transparent bipyramidal crystals up to 4 mm in size. The streak is white, and the luster is vitreous. Mohs hardness is 3½. Cleavage is poor on (010). Fracture is laminated, uneven across cleavage. The measured density is 3.25(2) g/cm3; the calculated density is 3.275 g/cm3. The mineral is biaxial (+), α = 1.661(5), β = 1.673(5), γ = 1.703(5), 2Vmeas = 70(10)°, 2Vcalc = 65.6°. The IR spectrum confirms the presence of H2O. The Mössbauer spectrum shows the presence of two sites for Fe2+ and one site for Fe3+ occupied in the ratio Fe12+:Fe22+:Fe3+ = 39:55:6. The chemical composition is as follows (electron microprobe, H2O determined by gas chromatography of ignition products, Fe apportioned between FeO and Fe2O3 based on Mössbauer data, wt%): MnO 29.21, FeO 21.74, Fe2O3 1.54, P2O5 34.59, H2O 12.6, total 99.68. The empirical formula, based on 11 O apfu, is H5.78Mn1.70Fe2+1.25Fe3+0.08P2.015O11. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 5.08 (43) (020), 4.314 (28) (002, 210), 3.220 (100) (221, 202), 3.125 (25) (122), 2.756 (35) (103, 230), 2.686 (25) (222, 113), 2.436 (22) (123), and 2.233 (23) (411, 331). The crystal structure is solved (R1 = 0.0176). Correianevesite is orthorhombic, space group Pbna, a = 9.4887(2), b = 10.1149(2), c = 8.7062(2) Å, V = 835.60(3) Å3, Z = 4. The refined crystal-chemical formula is: (Fe2+0.72Mn2+0.20Fe3+0.08)(Mn1.48Fe2+0.52)(PO4)2 (H2O,OH)3.

Windhoekite, Ca2Fe3+3−x(Si8O20)(OH)4·10H2O, a new palygorskite-group mineral from the Aris phonolite, Namibia

The new mineral windhoekite was discovered in a specimen from the Ariskop Quarry, near Windhoek, Namibia. Associated minerals are fluorapophyllite, aegirine, microcline, arisite-(Ce), arisite-(La). Windhoekite is yellow-brown, translucent; streak is beige. It forms isolated long-prismatic crystals up to 0.15 × 4 mm and their radial aggregates in cavities in phonolite. D calc is 2.630 g/cm 3 , D meas is 2.62 (2) g/cm 3 . The new mineral is biaxial (−), α = 1.610(3), β = 1.662(3), γ = 1.671(3), 2V (meas.) = 50(10)°, 2V (calc.) = 44°. Dispersion is not observed, pleochroism is strong ( Y ≈ Z > X, brown to dark brown), orientation: X ≈ a; Z = c . The IR spectrum is given. The chemical composition is (electron microprobe, mean of 5 analyses, wt%): CaO 9.24, MnO 0.85, Fe 2 O 3 23.14, Al 2 O 3 0.41, SiO 2 46.32, H 2 O (by gas chromatography) 21.0; total 100.96. The empirical formula based on 34 O atoms is: (Ca 1.68 Mn 0.12 )Fe 3+ 2.96 (Si 7.87 Al 0.08 O 20 )(OH) 4 ·10H 1.98 O. The simplified formula is: Ca 2 Fe 3+ 3− x [(Si,Al) 8 O 20 ](OH) 4 ·10H 2 O. The crystal structure was solved using single-crystal diffraction data. Windhoekite is monoclinic, space group C 2/ m , a = 14.319(5), b = 17.825(4), c = 5.242(1) A, β = 103.5(2)°, V = 1301.0(6) A 3 , Z = 2. Ca and Fe 3+ occupy two large octahedra and two smaller octahedra, respectively. The strongest lines of the powder diffraction pattern [ d , A ( I , %) ( hkl )] are: 11.04 (100) (110), 4.432 (10) (021), 4.133 (6) (22-1), 3.754 (4) (240), 3.486 (11) (400), 2.636 (8) (35-1), 2.551 (4) (002), 2.505 (6) (26-1). Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, under registration number 4018/1.

Depmeierite Na8[Al6Si6O24](PO4,CO3)1−x · 3H2O (x < 0.5): A new cancrinite-group mineral species from the Lovozero alkaline pluton of the Kola Peninsula

A new mineral depmeierite, the first cancrinite-group member with the species-forming extraframework anion PO43−, has been found at Mt. Karnasurt in the Lovozero alkaline pluton on the Kola Peninsula in Russia. Natrolite and depmeierite are the major components of a hydrothermal peralkaline veinlet 1.5 cm thick, which cross cuts the foyaite-urtite-lujavrite complex. The associated minerals are steenstrupine-(Ce), vuonnemite, epistolite, sodalite, aegirine, serandite, natisite, and vitusite-(Ce). Depmeierite occurs as colorless transparent isometric grains up to 1 cm in size. Its luster is vitreous. The mineral is brittle, and its cleavage (100) is perfect. Its Mohs hardness is 5, and D(meas) = 2.321(1) and D(calc) = 2.313 g/cm3. Depmeierite is optically biaxial positive, ω = 1.493(2), and ɛ = 1.497(2). The IR spectrum is given. The chemical composition is as follows (wt %, the average of 10 microprobe analyses with the H2O and CO2 determined by selective sorption): 23.04 Na2O, 0.54 K2O, 0.03 Fe2O3, 29.07 Al2O3, 36.48 SiO2, 3.30 P2O5, 0.08 SO3, 0.97 CO2, and 5.93 H2O; the total is 99.44. The empirical formula based on (Si,Al)12O24 is (Na758K0.12)Σ7.70(Si6.19Al5.81O24)[(PO4)0.47(CO3)0.22(OH)0.02(SO4)0.01]Σ0.72 · 3.345H2O. The simplified formula is Na8[Al6Si6O24](CO3)1 − x · 3H2O (x < 0.05). Depmeierite is hexagonal with space group P63, and the unit-cell dimensions are a = 12.7345(2), c = 5.1798(1), V = 727.46(2) Å3, and Z = 1. The strongest reflections of the X-ray powder pattern (d, Å (I, %) [hkl]) are as follows: 6.380(30) [110], 4.695(91) [101], 3.681(37) [300], 3.250(100) [211], 2.758 (33) [400], 2.596(31) [002], and 2.121(24) [330, 302]. The crystal structure was studied using a single crystal, and Rhkl = 0.0362. Depmeierite differs from cancrinite in the development of wide channels containing Na cations, H2O molecules, prevailing PO43−-anionic groups, and CO32−. The mineral is named in honor of the German crystallographer Wulf Depmeier (born in 1944). The type specimen is deposited at the Fersman Mineralogical Museum of the Russian Academy of Sciences in Moscow. The cancrinite sensu stricto subgroup separated within the cancrinite group comprises six minerals with AB frameworks, the smallest unit cell is (a ≈ 12.55–12.75, c ≈ 5.1–5.4 Å), and the chain […Na…H2O…]∞ exists in narrow channels: cancrinite, vishnevite, cancrisilite, hydroxycancrinite, kyanoxalite, and depmeierite. The P-bearing varieties of the cancrinite-group minerals are discussed, as well as the formation conditions of the noncarbonate members of the group related to intrusive alkaline complexes.

Perrierite-(La), (La,Ce,Ca)4(Fe2+,Mn)(Ti,Fe3+,Al)4(Si2O7)2O8, a new mineral species from the Eifel volcanic district, Germany

Non-metamict perrierite-(La) discovered in the Dellen pumice quarry, near Mendig, in the Eifel volcanic district, Rheinland-Pfalz, Germany has been approved as a new mineral species (IMA no. 2010-089). The mineral was found in the late assemblage of sanidine, phlogopite, pyrophanite, zirconolite, members of the jacobsite-magnetite series, fluorcalciopyrochlore, and zircon. Perrierite-(La) occurs as isolated prismatic crystals up to 0.5 × 1 mm in size within cavities in sanidinite. The new mineral is black with brown streak; it is brittle, with the Mohs hardness of 6 and distinct cleavage parallel to (001). The calculated density is 4.791 g/cm3. The IR spectrum does not contain absorption bands that correspond to H2O and OH groups. Perrierite-(La) is biaxial (-), α = 1.94(1), β = 2.020(15), γ = 2.040(15), 2Vmeas = 50(10)°, 2Vcalc = 51°. The chemical composition (electron microprobe, average of seven point analyses, the Fe2+/Fe3+ ratio determined from the X-ray structural data, wt %) is as follows: 3.26 CaO, 22.92 La2O3, 19.64 Ce2O3, 0.83 Pr2O2, 2.09 Nd2O3, 0.25 MgO, 2.25 MnO, 3.16 FeO, 5.28 Fe2O3, 2.59 Al2O3, 16.13 TiO2, 0.75 Nb2O5, and 20.06 SiO2, total is 99.21. The empirical formula is (La1.70Ce1.45Nd0.15Pr0.06Ca0.70)Σ4.06(Fe0.532+Mn0.38Mg0.08)Σ0.99(Ti2.44Fe0.803+Al0.62Nb0.07)Σ3.93Si4.04O22. The simplified formula is (La,Ce,Ca)4(Fe2+,Mn)(Ti,Fe3+,Al)4(Si2O7)2O8. The crystal structure was determined by a single crystal. Perrierite-(La) is monoclinic, space group P21/a, and the unit-cell dimensions are as follows: a =13.668(1), b = 5.6601(6), c = 11.743(1) Å, β = 113.64(1)°; V = 832.2(2) Å3, Z = 2. The strong reflections in the X-ray powder diffraction pattern are [d, Å (I, %) (hkl)]: 5.19 (40) (110), 3.53 (40) (

Biachellaite, (Na,Ca,K)8(Si6Al6O24)(SO4)2(OH)0.5 · H2O, a new mineral species of the cancrinite group

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Mendigite, Mn2Mn2MnCa(Si3O9)2, a new mineral species of the bustamite group from the Eifel volcanic region, Germany

11), 2.96 (100) (

Osumilite-(Mg): Validation as a mineral species and new data

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