An optical and X-ray examination of the basic-slag mineral silicocarnotite

1949 ◽  
Vol 28 (204) ◽  
pp. 496-504 ◽  
Author(s):  
D. P. Riley ◽  
E. R. Segnit
Keyword(s):  
Optical Properties ◽  
Chemical Analysis ◽  
Basic Slag ◽  
X Ray

Blue pleochroic crystals obtained from basic slag were first described by Carnot and Richard. They published a chemical analysis, some of the optical properties, and a brief description of the forms they observed. The crystals were stated to be orthorhombic, with a composition of 5CaO.P205.SiO2. Several authors later described similar crystals. None, however, gave a thorough account of the optical properties. These various papers were summarized and discussed by Kroll, who accepted Carnot's formula, but concluded, from Bücking and Linck's examination, that the material was monoclinic. Kroll applied the rather unfortunate term ‘silico-carnotite’ to these crystals.The present work shows that silicocarnotite occurs in only one modification–orthorhombic. The crystals drawn by Bricking and Linck and described as monoclinic are, in fact, identical with our orthorhombie crystals.

Sector growth and symmetry of (F,OH) apatite from the Asio mine, Japan

1994 ◽  
Vol 58 (391) ◽  
pp. 307-314 ◽  
Author(s):  
Mizuhiko Akizuki ◽  
Hirotugu Nisidoh ◽  
Yasuhiro Kudoh ◽  
Tomohiro Watanabe ◽  
Kazuo Kurata
Keyword(s):  
Optical Properties ◽  
Crystal Growth ◽  
Electron Diffraction ◽  
Chemical Analysis ◽  
Growth Surface ◽  
Complete Disappearance ◽  
X Ray ◽  
Solid Crystal ◽  
Wet Chemical ◽  
Growth Features

AbstractA study of apatite crystals from the Asio mine, Japan, showed sectoral texture related to the growth of the crystal, and with optically biaxial properties within the sectors. Wet chemical analysis gave a composition Ca5(PO4)3(F0.64,OH0.38,Cl0.01)1.03 for the specimen.Additional diffraction spots were not observed in precession and oscillation X-ray photographs and electron diffraction photographs. Since the internal textures correlate with the surface growth features, it is suggested that the internal textures and the unusual optical properties were produced during nonequilibrium crystal growth. The fluorine/hydroxyl sites in hexagonal apatite are symmetrically equivalent in the solid crystal but, at a growth surface, this equivalence may be lost, resulting in a reduction of crystal symmetry. Heating of the apatite to about 850°C results in the almost complete disappearance of the optical anomalies due to disordering, which may be related to the loss of hydroxyl from the crystal.

Holtite: a new mineral allied to dumortierite

1971 ◽  
Vol 38 (293) ◽  
pp. 21-25 ◽  
Author(s):  
M. W. Pryce
Keyword(s):  
Optical Properties ◽  
Chemical Analysis ◽  
Western Australia ◽  
Prime Minister ◽  
Unit Cell ◽  
New Mineral ◽  
Space Group ◽  
Free Basis ◽  
X Ray ◽  
The Government

SummaryHoltite, a new mineral allied to dumortierite, occurred as pebbles with stibiotantalite and tantalite on an alluvial tin lease near Greenbushes, Western Australia, and is named after the late H. E. Holt, Prime Minister of Australia.The mineral is orthorhombic with a 11·905 Å, b 20·355 Å, c 4·690 Å, space group Pmcn, weak supercell 2a, 2b, c developed. Crystals are elongated along c, D 3·90 ± 0·02, hardness 8½, fluorescent. Optical properties α 1·743−1·746, mainly yellow, ‖ [001], β 1·756−1·759, colourless, γ 1·758−1·761, colourless, 2Vα 49−55°, r < v. X-ray powder data are given.Chemical analysis gave SiO2 20·30, Sb2O5 4·61, Al2O3 46·43, Ta2O5 11·24, Nb2O5 0·76, Fe2O3 0·27, MnO 0·05, TiO2 0·09, BeO 0·05, B2O3 1·82, Sb2O3 13·89, H2O+ 0·38, H2O− 0·08, sum 99·97%. On a water-free basis the unit cell contains Al24·5Sb2·56‴Ta1·36Sb0·76vNb0·16Fe0·10‴Be0·05Ti0·03Mn0·02B1·40‴Si9·09O66·85. Compared with dumortierite, 4[(A1,Fe)7BSi3O18] or 4 (X11O18), the holtite unit cell contains approximately 4(X10O17).Type material is preserved at the Government Chemical Laboratories, Perth, Western Australia.

The crystal-structure and optical properties of matlockite (PbFCl)

1934 ◽  
Vol 23 (146) ◽  
pp. 587-597 ◽  
Author(s):  
F. A. Bannister
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Single Crystal ◽  
British Museum ◽  
Museum Collection ◽  
X Ray ◽  
Fluorine Determination

It has recently been shown by W. Nieuwenkamp that matlockite is identical in chemical composition and crystal-structure with artificial lead fluochloride PbFC1. His conclusion is based upon powder photographs of the two substances and a fluorine determination of a specimen of matlockite from Matlock, Derbyshire. The present work was undertaken primarily to check Nieuwenkamp's interesting results. Access to an exceptionally fine suite of matlockite specimens in the British Museum collection made possible single crystal X-ray measurements, accurate optical determinations, and a new chemical analysis.

Investigations on surface chemical analysis using X-ray photoelectron spectroscopy and optical properties of Dy3+-doped LiNa3P2O7 phosphor

2016 ◽  
Vol 1118 ◽  
pp. 117-123 ◽  
Author(s):  
K. Munirathnam ◽  
G.R. Dillip ◽  
Shivanand Chaurasia ◽  
S.W. Joo ◽  
B. Deva Prasad Raju ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chemical Analysis ◽  
Photoelectron Spectroscopy ◽  
Surface Chemical ◽  
X Ray ◽  
Surface Chemical Analysis

Calcium sulphosilicate in lime-kiln wall coating

1972 ◽  
Vol 38 (300) ◽  
pp. 968-971 ◽  
Author(s):  
M. W. Pryce
Keyword(s):  
Optical Properties ◽  
Chemical Analysis ◽  
Organic Acids ◽  
Western Australia ◽  
X Ray ◽  
Lime Kiln ◽  
Sulphur Trioxide ◽  
The Government ◽  
Oil Fuel ◽  
Pale Green

SummaryGreen calcium sulphosilicate layers were formed in lime-larnite-calcite wall coating in a lime kiln at Rivervale, Western Australia. The compound formed in the kiln flame area by the combination of siliceous lime sand feed with sulphur trioxide from the sulphurous oil fuel.The calcium sulphosilicate is orthorhombic with a 10·183, b 15·408, c 6·825 Å, space group Pcmn. Crystals are [100] tablets or prisms elongated along c, D 2·95, hardness 5, streak pale green, decomposed by organic acids. Optical properties α 1·632 = [001] blue, β 1·638 = [100] yellow-green γ 1·640 yellow-green, 2Vα = 60°, dispersion r > v, X-ray powder lines: 2·855 (10) 032,202; 2·838 (7) 330,321; 3·35 (6) 012; 2·622 (6) 331; 2·571 (6) 060; 3·20 (5) 231; 1·962 (5); 1·899 (5); 1·896 (5); 1·372 (5).Chemical analysis by P. Hewson gave: SiO2 21·50, Al2O3 1·83, Fe2O2 0·50, CO2 0·49, P2O5 0·23, CaO 57·19, MgO 0·35, Na2O 0·22, K2O 0·22, SrO 0·15, Li2O 0·06, SO3 16·71, H2O+ 0·28, H2O− 0·10, others 0·04, total 99·87. On a water-free basis the unit cell contains Ca19.66 Mg0.17 Na0.14 K0.08 Sr0.03 Li0.08 approximately 4[Ca5(SiO4)2SO4] and isostructural with silicocarnotite, 4[Ca5(PO4)2SiO4]. Type material is preserved at the Government Chemical Laboratories, Perth, Western Australia.

Kalsilite in venanzite from San Venanzo, Umbria, Italy

1953 ◽  
Vol 30 (220) ◽  
pp. 46-48 ◽  
Author(s):  
F. A. Bannister ◽  
TH. G. Sahama ◽  
H. B. Wuk
Keyword(s):  
Optical Properties ◽  
Chemical Analysis ◽  
Bulk Rock ◽  
Natural Mineral ◽  
X Ray

Shortly after the discovery of the mineral kalsilite, the pure potash analogue to nepheline, as a natural mineral occurring in some volcanic ]avas of SW. Uganda by Bannister and Hey, Professor Arthur Holmes suggested that the ncpheline-looking ruineral occurring in a very potash-rich lava at San Venanzo, Umbria, Italy, also might be kalsilitc. His suggestion was based on the high potash : soda ratio of the bulk rock and on the optical properties of the mineral. No X-ray evidence or chemical analysis on the supposed kalsilite has been presented so far.

Kalsilite, a polymorph of KAlSiO4, from Uganda

1942 ◽  
Vol 26 (177) ◽  
pp. 218-224 ◽  
Author(s):  
F. A. Banister ◽  
Max H. Hey
Keyword(s):  
Optical Properties ◽  
Chemical Analysis ◽  
Thin Section ◽  
Preceding Paper ◽  
X Ray ◽  
Additional Information ◽  
Ray Methods ◽  
Chemical Evidence ◽  
Potassium Aluminosilicate

Professor Arthur Holmes has described in the preceding paper a suite of rocks from Mafuru, Uganda. During his study he observed in thin section a mineral which in optical properties is indistinguishable from nepheline. He gives chemical evidence, however, for the presumption that a potassium aluminosilicate is present in mafurite which would suggest either that the nepheline-like mineral is kaliophilite or a polymorphous form of KAlSiO4. Kaliophilite is not isomorphous with nepheline, but has similar optical properties, and the two minerals could be easily confused in thin section. They may, however, be rapidly distinguished by X-ray methods. Even minute grains insufficient for chemical analysis can be determined with certainty; so it seemed probable that an X-ray study of the nepheline-like mineral from Uganda would give additional information and decide whether or no a separation and chemical analysis of the mineral should be attempted. Professor Holmes accordingly invited me to examine his specimens and rock-sections.

Urea, a new mineral, and neotype phosphammite from Western Australia

1973 ◽  
Vol 39 (303) ◽  
pp. 346-348 ◽  
Author(s):  
P. J. Bridge
Keyword(s):  
Optical Properties ◽  
Chemical Analysis ◽  
Western Australia ◽  
Type Material ◽  
New Mineral ◽  
Space Group ◽  
X Ray ◽  
Group A ◽  
The Government

SummaryUrea, a new mineral identical with the artificial compound, occurs as crystals associated with phosphammite, ammonian aphthitalite, and weddellite in guano from Toppin Hill, 123° 56′ E., 28° 42′ S., Western Australia. The urea occurs as elongated tetragonal pyramids, space group , a 5·646, c 4·701 Å, X-ray powder data are given. Optical properties: ω 1·484, ε 1·603. Chemical analysis gave urea, CO(NH2)2 96·0, H2O− 0·46, Na 0.13, K 0·35, Ca 0·07, Mg 0·03, S 0·11, P 0·24, NH3 < 1·0 %, remainder probably mainly H2O+; urea 96 %, impurities 4 %. Type material is preserved in the collection of the Government Chemical Laboratories, Perth, Western Australia.

Magnesian collinsite from Milgun Station, Western Australia

1974 ◽  
Vol 39 (305) ◽  
pp. 577-579 ◽  
Author(s):  
P. J. Bridge ◽  
M. W. Pryce
Keyword(s):  
Optical Properties ◽  
Chemical Analysis ◽  
Western Australia ◽  
X Ray ◽  
The Government ◽  
White Streak

SummaryAn occurrence of magnesian collinsite has been found with other rare phosphates in a variscite deposit in semi-desert 15 km NW. of Milgun Station homestead (25° 6′ S., 118° 18′ E.), Western Australia. The collinsite occurs as tapering white 3-mm prisms, mammillated aggregates, and thin veinlets in cavities in mudstone. The crystals have two good cleavages, D2.93, subvitreous lustre, H4–5, white streak and are brittle. Optical properties α 1·632, β 1·642, γ 1·657, 2Vγ , ≈ 80°. The mineral is triclinic with a 5·734, b 6·780, c 5·441 Å, α97·29° β 108·56°, γ 107·28°. X-ray powder data given, the lines are similar to P.D.F. card 14–314 but new cell gives better indexing. Chemical analysis by F. R. W. Lindsey gave FeO 0·07, MgO 11·3, CaO 35·2, Na2O 0·01, K2O 0·02, P2O5 41·2, H2O+10·7, H2O− 0·15, F0·02, SiO2 (quartz impurity) 1·31, Al, Mn, Zn, SO3 not detected, net sum 99·97, close to Ca2Mg(PO4)2.2H2O, after deduction of moisture and quartz impurity. Typical specimens are preserved at the Government Chemical Laboratories, Perth, Western Australia.

Stevensite from the Whin Sill in the Region of the North Tyne

1959 ◽  
Vol 32 (246) ◽  
pp. 218-225 ◽  
Author(s):  
B. A. O. Randall
Keyword(s):  
Optical Properties ◽  
Chemical Analysis ◽  
Close Similarity ◽  
X Ray ◽  
Alteration Product ◽  
The North ◽  
Satisfactory Method

SummaryA stevensite occurring as an alteration product of pectolite in amygdale-like structures within the Whin Sill is described. Data given for the stevensite include optical properties, stain reactions, chemical analysis, X-ray powder data, and D.T.A. curves. The close similarity between many of the properties of sepielite and stevensite is indicated and D.T.A. is shown to be the most satisfactory method of distinguishing between the two minerals.

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