Raman microscopy of inclusions in blue halites

Wesełucha–Birczyńska, Aleksandra; Toboła, Tomasz; Natkaniec‐Nowak, Lucyna

doi:10.1016/j.vibspec.2008.05.005

Cited by 17 publications

(6 citation statements)

References 16 publications

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“…In this case, the various Cu/Fe ratios (much higher for blue samples) together with other trace elements such as V, Cr, and water could all create the various colours of phosphates from this region. Moreover, it seems that not only metal and water content but also the local symmetry around these ions affects the colouration of these gemstones …”

Section: Discussionsupporting

confidence: 93%

“…Moreover, it seems that not only metal and water content but also the local symmetry around these ions affects the colouration of these gemstones. [32] In general, both blue and green varieties of turquoiseplanerite solid solution exhibit similar Raman spectra with some band broadening most probably caused by the small size of their crystals. [17] However, some differences are noted in the position of individual bands as well as their intensities.…”

Section: Discussionmentioning

confidence: 99%

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Blue or green? turquoise–planerite species from Carico Lake Valley in Nevada, the United States: Evidence from Raman spectroscopy

Dumańska‐Słowik

Wesełucha–Birczyńska

Natkaniec‐Nowak

et al. 2019

J Raman Spectroscopy

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Blue and green turquoise–planerite species from Carico Lake Valley in Nevada have the formulae □0.69(Na0.01K0.01Cu0.20Ca0.06Mg0.02Ba0.01 Zn0.01)(Al5.97V0.04 Fe0.03)[PO4]4 (OH)8·4H2O and □0.66(K0.01Cu0.24Ca0.05Mg0.02Ba0.01Zn0.01)(Al5.87Fe0.13)[PO4]4(OH)8·4H2O, respectively. The content of Al3+ and Fe3+ at the B‐site together with slight differences in Cu amount at the A‐site is the main factors that differentiate these two species. Green planerite shows higher crystallinity and contains less water in its structure. The blue species is more porous with a lower degree of structural order and higher water enrichment. The Cu/Fe ratio together with local symmetry around chromophore ions in the structure seem to be responsible for the specific colouration of both phosphates. The species are inhomogeneous and contain a wealth of mineral (goethite, barite, quartz, kaolinite, chloritoid, destinezite, and some vanadate) and organic inclusions (bituminous matter and aliphatic hydrocarbons). Raman microspectroscopy with the application of different exciting radiation, that is, laser lines of 514.5 nm (green) and 442 nm (blue) for blue and green turquoise–planerite species revealed further differences between these two coloured species: (a) various positions of the most intensive band attributed to ν3 (PO4)3‐, (b) shift of ν3 four component bands, (c) various intensity ratios and integral intensity ratios of ν3 component bands, and (d) some diagnostic bands coming from Fe‐O (green species) and Cu‐O vibrations (blue species) obtained with principal component analysis (PCA).

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Blue or green? turquoise–planerite species from Carico Lake Valley in Nevada, the United States: Evidence from Raman spectroscopy

Dumańska‐Słowik

Wesełucha–Birczyńska

Natkaniec‐Nowak

et al. 2019

J Raman Spectroscopy

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“…Optical anisotropy was also observed in thick sections (0.5 mm) prepared for fluid inclusion analysis ( Fig. 4a, b; compare Wesełucha-Birczyńska et al 2008). Observations under the transmittedlight microscope revealed that the blue halite contains many various solid-phase inclusions well separated from the halite matrix.…”

Section: Optical Microscopymentioning

confidence: 76%

Lattice deformation of blue halite from Zechstein evaporite basin: Kłodawa Salt Mine, Central Poland

et al. 2014

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“…The third sam ple rep re sents a "blue ha lite" (Natkaniec-Nowak and Tobo³a, 2003;Tobo³a et al, 2007;Tobo³a and Natkaniec-Nowak, 2008;Wese³ucha-Birczyñska et al, 2008;Zelek et al, 2008Zelek et al, , 2014Tobo³a, 2016) while the fourth sam ple was taken from bi tu mi nous salts (Tobo³a, 2010;Wese³ucha-Birczyñska and Tobo³a, 2016). Both types of salt oc cur in the K³odawa Salt Dome (cen tral Po land) in the form of veins or nests within al most all the Zechstein de pos its (Fig.…”

Section: Methodsmentioning

confidence: 99%

Microhardness analysis of halite from different salt-bearing formations

Toboła¹,

Cyran²,

Rembiś³

2019

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As so ci ate ed i tor: Wojciech Drzewicki Micro hard ness tests were car ried out on sin gle ha lite crys tals. They were con ducted on the (001) sur face, with the in denter set in two di rec tions: par al lel to the ha lite face (010); and par al lel to the (110) face. The ha lite crys tals rep re sent salt for mations of dif fer ent ages (De vo nian, Zechstein, Badenian), depths (from 1835.5 to 195 m) and in ten si ties of tec tonic dis turbance (hor i zon tally strat i fied, salt dome, strongly folded). The mea sure ment re sults re vealed spe cific fea tures of the ha lite crys tals ana lysed. Firstly, the data ob tained show micro hard ness ani so tropy in ha lite crys tals. More over, micro hard ness corre lates with the depth of the salt-bear ing for ma tions. Ha lite crys tals from deeper lev els showed higher micro hard ness, though there was no cor re la tion be tween the in ten sity of tec tonic de for ma tion and the av er age Vickers hard ness (HV). The sam ples ana lysed show a vari abil ity of HV val ues and and of the shapes of im prints. These in di cate zones where ha lite crystals are de formed at the atomic level and re flects the pres ence of de fects in the crys tal lat tice. Such de for ma tion is re flected in an ir reg u lar ity of the strike of cleav age planes. Con se quently, the anal y sis of im print shapes is a use ful method for the exam i na tion of duc tile min er als and ma te ri als. Key words: micro hard ness, ha lite, salt for ma tion, crys tal de fects, dis lo ca tions, shape of im print.

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Raman microscopy of inclusions in blue halites

Cited by 17 publications

References 16 publications

Blue or green? turquoise–planerite species from Carico Lake Valley in Nevada, the United States: Evidence from Raman spectroscopy

Blue or green? turquoise–planerite species from Carico Lake Valley in Nevada, the United States: Evidence from Raman spectroscopy

Lattice deformation of blue halite from Zechstein evaporite basin: Kłodawa Salt Mine, Central Poland

Microhardness analysis of halite from different salt-bearing formations

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