Sulpharsenites of lead from the Binnenthal. Part IV.—Seligmannite : with a supplementary note on Baumhauerite

1903 ◽  
Vol 13 (62) ◽  
pp. 336-341 ◽  
Author(s):  
R. H. Solly
Keyword(s):  
Chemical Analysis ◽  
New Mineral ◽  
Chemical Formula ◽  
Supplementary Note ◽  
Small Crystals ◽  
Orthorhombic Crystals

Professor Baumhauer, in January, 1901, described five very small crystals of a new mineral, to which he gave the name seligmannite. They were associated with rathite and binnite in dolomite, and came from the Lengenbach quarries in the Binnenthal, Switzerland. In June, 1902, he described another crystal, the angles of which agreed fairly well with those of the crystals he had previously measured. In habit and twinning, these orthorhombic crystals so closely resembled bournonite that he ventured to assign to the new mineral the chemical formula Cu2S.2PbS.As2S3, but from paucity of material he was unable to make a chemical analysis.

scholarly journals An examination of some rare minerals from the nepheline syenites of South West Greenland

1959 ◽  
Vol 20 ◽  
pp. 1-35
Author(s):  
M Danø ◽  
H Sørensen
Keyword(s):  
Chemical Analysis ◽  
Kola Peninsula ◽  
New Mineral ◽  
Secondary Mineral ◽  
Thin Sections ◽  
Preliminary Examination ◽  
South West ◽  
Small Crystals ◽  
Small Clusters ◽  
White Mineral

In the present paper the mineralogy and petrological importance of some minerals from the nepheline syenites of South Greenland are discussed. The firstnamed mineral, igalikite, is from the Igaliko batholith, the remainder are from the Ilímaussaq batholith (see Ussing, 33). Igalikite was described by Bøggild from a boulder collected near Igaliko. On re-examination of this mineral it was shown to be a pseudomorph of analcime and "gieseckite" after nepheline. Naujakasite was described by Bøggild from a boulder collected at Naujakasik. The mineral has now been found in lujavrite at Tuperssuatsiaq and in the northern part of the Ilimaussaq batholith. Monazite in small clusters of angular grains are quite common in the lujavrites. The erikite described by Bøggild is shown to be a mixture of monazite and analcime and/or natrolite. Britholite has been found as small crystals in a number of altered lujavrites. Monazite and britholite are both considered to be formed at the expense of the material set free during the alteration of the eudialyte of the nepheline syenites. Neptunite in macroscopic grains is rare, but the mineral is commonly seen in thin sections, especially in rocks with altered eudialyte. The neptunite was probably formed during hydrothermal alteration of the eudialyte. A white mineral has been found at Igdlunguaq associated with neptunite, epistolite and analcime. The mineral has a primitive cubic unit cell and is probably a Na- and Nb-rich perovskite mineral. A more detailed description of this possibly new mineral will be undertaken when a chemical analysis has been carried out. Ussingite was described by Bøggild from boulders. It has now been found in place at the head of Kangerdluarssuk where it occurs in a recrystallized zone of deformation in naujaite. It is associated with steenstrupine, lovozerite (?), and ægirine and is secondary after microcline and sodalite. Lovozerite(?) a mineral resembling the lovozerite of the Kola peninsula has been found associated with the ussingite of Kangerdluarssuk and also with eudialyte in lujavrite. It is interpreted as a secondary mineral after eudialyte. Epistolite is according to a preliminary examination a member of an isomorphous series of which the murmanite of the Kola peninsula is another member.

Choloalite, CuPb(TeO3)2·H2O, a new mineral

1981 ◽  
Vol 44 (333) ◽  
pp. 55-57 ◽  
Author(s):  
S. A. Williams
Keyword(s):  
Chemical Analysis ◽  
Thin Section ◽  
Type Locality ◽  
New Mineral ◽  
Wet Chemical

AbstractProbably first found in Arabia, then Moctezuma, Sonora (the type locality), finally at Tombstone, Arizona. Crystals are cubic, invariably octahedral in habit, up to 2 mm in size. Colour forest green (RHS 136A), H = 3, D = 6.4.Wet chemical analysis gave CuO 11.0%, PbO 33.0, TeO2 50.7, H2O 3.4; soluble in cold dilute acids. The strongest lines are 7.223(5), 4.170(2), 3.614(3), 3.472(4), 3.343(6), 3.036(10), 7.952(3), 2.454(5) Å. The cell indexes as cubic, a = 12.519 Å; for Z = 12, ρcalc = 6.41 g/cm3. May be anisotropic in thin section with birefringence up to 0.011; n = 2.04.

Theisite, a new mineral from Colorado

1982 ◽  
Vol 46 (338) ◽  
pp. 49-50 ◽  
Author(s):  
S. A. Williams
Keyword(s):  
Chemical Analysis ◽  
New Mineral

AbstractFound by N. Theis at a uranium prospect near Durango, Colorado. Occurs with uraninite, galena, malachite, azurite, etc. Colour pale blue-green, H = 1½, G = 4.25. Optically 2Vα ≈ 0°, α = 1.755, β = γ = 1.785; non-pleochroic. Chemical analysis on 1034 µg gave CuO 33.3 %, ZnO 33.1, CaO 0.3, As2O5 14.8, Sb2O5 7.0, H2O 10.5 leading to Cu5Zn5{(As,Sb)O4}2(OH)14. The cell indexes as orthorhombic a = 8.225Å, b = 7.123, c = 14.97. Strongest lines are 14.97 (9), 7.483 (5), 4.112 (4), 3.741 (10), 2.996 (4), 2.534 (9), 1.830 (5), 1.553 (3). The mineral and name have been approved by the Commission on New Minerals and Mineral Names, IMA.

Kennedyite, a new mineral of the pseudobrookite series

1961 ◽  
Vol 32 (252) ◽  
pp. 676-682 ◽  
Author(s):  
O. von Knorring ◽  
K. G. Cox
Keyword(s):  
Chemical Analysis ◽  
Alkali Feldspar ◽  
New Mineral ◽  
X Ray ◽  
South Eastern ◽  
Approximate Composition ◽  
Southern Rhodesia ◽  
Hills Area

SummaryA new mineral with the approximate composition of Fe2MgTi3O10 and isostructural with pseudobrookite Fe4Ti2O10 has been observed in an olivine-augite-alkali-feldspar rock of the Karroo succession from the Mateke Hills area in south-eastern Southern Rhodesia. Chemical analysis and indexed X-ray powder data (α 9·77, b 9·95, c 3·73 Å.) of the mineral are given, and the name kennedyite is proposed. The name karrooite is proposed for the artificial product MgTi2O5.

The crystal structure of voggite, a new hydrated Na–Zr hydroxide–phosphate–carbonate mineral

1990 ◽  
Vol 54 (376) ◽  
pp. 495-500 ◽  
Author(s):  
Jan T. Szymański ◽  
Andrew C. Roberts
Keyword(s):  
Crystal Structure ◽  
Electron Microprobe ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Bidentate Ligand ◽  
New Mineral ◽  
Chemical Formula ◽  
The Third ◽  
Carbonate Ion ◽  
Phosphate Carbonate

AbstractThe crystal structure of the new mineral voggite, Na2Zr(PO4)(CO3)(OH).2H2O , from the Francon quarry, Montreal, Quebec, Canada, has been solved in order to determine the correct chemical formula, as conventional electron microprobe methods were found unreliable. The unit cell is monoclinic, I2/m, with a = 12.261(2), b = 6.561(1), c = 11.757(2)Å, β = 116.19(2)°. The structure consists of layers of edge-sharing Zr-O pentagonal bipyramids, separated by layers of Na-(O,H2O) octahedra. The carbonate ion acts as a bidentate ligand in the Zr-O polyhedron, the third oxygen atom being bonded to the Na atom. The phosphate group is bonded to three different Zr atoms and to a Na atom. The Zr-O bond lengths vary from 2.067 to 2.283 (mean 2.140Å), while Na-O are between 2.304 and 2.773, (σ = 0.006Å, mean 2.480Å). The carbonate and phosphate bonds are normal. It is inferred from the structure that the columns of octahedrally coordinated Na atoms can easily be broken apart when subjected to the heat generated by the electron microprobe beam, with the subsequent expulsion of water. This gives rise to ‘mobile’ Na atoms, which make quantitative electron microprobe analysis extremely difficult. The structure allows the ‘liberated’ Na atoms to move freely within planes parallel to .

scholarly journals Crystal Chemistry of Sulfates from the Apuan Alps (Tuscany, Italy). V. Scordariite, K8(Fe3+0.67□0.33)[Fe3+3O(SO4)6(H2O)3]2(H2O)11: A New Metavoltine-Related Mineral

Minerals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 702 ◽  
Author(s):  
Biagioni ◽  
Bindi ◽  
Mauro ◽  
Hålenius
Keyword(s):  
Crystal Structure ◽  
Layered Structure ◽  
New Mineral ◽  
Formula Unit ◽  
Crystal Data ◽  
Chemical Formula ◽  
X Ray ◽  
New Mineral Species ◽  
Apuan Alps ◽  
The Ideal

The new mineral species scordariite, K8(Fe3+0.67□0.33)[Fe3+3O(SO4)6(H2O)3]2(H2O)11, was discovered in the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy. It occurs as pseudo-hexagonal tabular crystals, yellowish to brownish in color, up to 0.5 mm in size. Cleavage is perfect on {0001}. It is associated with giacovazzoite, krausite, gypsum, jarosite, alum-(K), and magnanelliite. Electron microprobe analyses give (wt %): SO3 47.31, Al2O3 0.66, Fe2O3 24.68, FeO 0.69, Na2O 0.52, K2O 17.36, H2Ocalc 15.06, total 106.28. The partitioning of Fe between Fe2+ and Fe3+ was based on Mössbauer spectroscopy. On the basis of 67 O atoms per formula unit, the empirical chemical formula is (K7.50Na0.34)Σ7.84(Fe3+6.29Al0.26Fe2+0.20)Σ6.75S12.02O50·17H2O. The ideal end-member formula can be written as K8(Fe3+0.67□0.33)[Fe3+3O(SO4)6(H2O)3]2(H2O)11. Scordariite is trigonal, space group R-3, with (hexagonal setting) a = 9.7583(12), c = 53.687(7) Å, V = 4427.4(12) Å3, Z = 3. The main diffraction lines of the observed X-ray powder pattern are [d(in Å), estimated visual intensity]: 8.3, strong; 6.6, medium; 3.777, medium; 3.299, medium; 3.189, medium; 2.884, strong. The crystal structure of scordariite has been refined using X-ray single-crystal data to a final R1 = 0.057 on the basis of 1980 reflections with Fo > 4σ(Fo) and 165 refined parameters. It can be described as a layered structure formed by three kinds of layers. As with other metavoltine-related minerals, scordariite is characterized by the occurrence of the [Fe3+3O(SO4)6(H2O)3]5− heteropolyhedral cluster.

Zeophyllite from Monte Somma, Vesuvius, Italy

1983 ◽  
Vol 47 (344) ◽  
pp. 397-400 ◽  
Author(s):  
Elio Passaglia ◽  
Cesare Porcelli
Keyword(s):  
Chemical Analysis ◽  
Calcium Silicate ◽  
Unit Cell ◽  
Powder Pattern ◽  
Chemical Formula ◽  
Anionic Sites ◽  
Welded Tuff ◽  
Cell Dimensions ◽  
Unit Cell Dimensions ◽  
Oxygen Atoms

AbstractZeophyllite, a rare calcium silicate, occurs at Monte Somma, Italy, as milky-white, slightly fibrous spherules associated with apophyllite on the surface of pumice in a welded tuff dated 472 AD. The chemical analysis and the indexed powder pattern, along with the chemical formula and unit cell dimensions calculated from these data, are given. The deficiency of Ca and Si cations and the abundance of (OH) and F anions in the chemical formula calculated on the basis of 38 anions (O + F) is interpreted as due to the presence of (O4H4) substituting for (SiO4) tetrahedra and of fluorine instead of oxygen atoms in two anionic sites.

Leguernite, Bi12.67O14(SO4)5, a new Bi oxysulfate from the fumarole deposit of La Fossa crater, Vulcano, Aeolian Islands, Italy

2014 ◽  
Vol 78 (7) ◽  
pp. 1629-1645 ◽  
Author(s):  
Anna Garavelli ◽  
Daniela Pinto ◽  
Donatella Mitolo ◽  
Luca Bindi
Keyword(s):  
New Mineral ◽  
Volcanic Gases ◽  
Monoclinic Space Group ◽  
Chemical Formula ◽  
X Ray Diffraction ◽  
Sulfate Ion ◽  
Calculated Density ◽  
Aeolian Islands ◽  
X Ray ◽  
Fossa Crater

AbstractLeguernite, ideally Bi12.67O14(SO4)5, is a new mineral found in high-temperature fumarolic assemblages at La Fossa crater, Vulcano, Aeolian Islands, Italy. It occurs as aggregates of needleshaped crystals associated strictly with anglesite, balićžunićite and an unknown Bi sulfate. Leguernite is colourless to white, transparent, non-fluorescent, has a sub-adamantine lustre and a white streak. Electron microprobe data led to the chemical formula (on the basis of 34 anions p.f.u.) (Bi12.40Pb0.15)Σ=12.55S5.08O34. The calculated density is 7.375 g cm–3. A Raman spectrum collected on a single crystal of leguernite confirmed the anhydrous nature of the mineral.Leguernite is monoclinic, space group P2, with a = 11.2486(11), b = 5.6568(6), c = 11.9139(10) Å , β = 99.177(7)º, V = 748.39(12) Å3 and Z = 1. The crystal structure is built up of Bi–O blocks of a fluorite-like structure with Bi12O14 composition separated by a single sulfate ion along [100] and by Bi(SO4)45– groups along [101]. It can also be described as composed of (001) layers with composition [Bi12O14(SO4)6+]n alternating with layers of composition [Bi(SO4)4]n5– along [001]. Leguernite shows significant similarities with the synthetic Bi14O16(SO4)5 compound.The eight strongest reflections in the powder X-ray diffraction data [d in Å (I) (hkl)] are: 3.220 (100) (013), 3.100 (95) (11), 2.83 (30) (020), 2.931 (25) (302), 2.502 (25) (04), 2.035 (20) (322), 1.875 (20) (24) and 5.040 (15) (110).The name is in honour of Franc¸ois “Fanfan” Le Guern (1942–2011), who was a very active volcanologist and specialist in volcanic gases and sublimates. Both the mineral and the mineral name have been approved by the IMA-CNMNC (2013–051).

Aramayoite, a new mineral, from Bolivia

1926 ◽  
Vol 21 (115) ◽  
pp. 156-162 ◽  
Author(s):  
L. J. Spencer
Keyword(s):  
Chemical Analysis ◽  
British Museum ◽  
New Mineral

Bolivian minerals have been sent tbr examination and preservation in the British Museum oolleetiml at various times since 1894 by my old school-fellow Mr. Malcolm Robmts, A.R.S.M., now General ganager of the Compagnie Aramayo de Mines en Bolivie. Several of these have been described in the pages of this magazine (see vol. 14, p. 309). Although he has industriously collected Bolivian minerals for over thirty years he is only now rewarded by the discovery of a species new to science. The material which he has been good enough to entrust to me for description was recognized by him as being probably something new, and this was confirmed by a chemical analysis made by Mr. T. Burns MeGhie in the assay office at Quechisla in Bolivia.

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