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geerite

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Journal Article
Published: 01 November 1980
The Canadian Mineralogist (1980) 18 (4): 519–523.
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SELECTED COMPOSITIONS OF COVELLITE, YARROWITE, SPIONKOITE AND <span class="search-highlight">GEERITE</span> (?)
Published: 01 August 2007
TABLE 9. SELECTED COMPOSITIONS OF COVELLITE, YARROWITE, SPIONKOITE AND GEERITE (?)
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Photo (in refracted light) of electrum grain (470–500‰) in the interstices ...
Published: 01 March 2018
Fig. 9. Photo (in refracted light) of electrum grain (470–500‰) in the interstices of the albite–pyroxene matrix. The grain contains inclusions of tetra-auricupride and copper sulfides (anilite, geerite, spionkopite, and yarrowite) (stage Ic). The tetra-auricupride inclusions are similar in shape
Journal Article
Published: 01 March 2018
Russ. Geol. Geophys. (2018) 59 (3): 238–256.
...Fig. 9. Photo (in refracted light) of electrum grain (470–500‰) in the interstices of the albite–pyroxene matrix. The grain contains inclusions of tetra-auricupride and copper sulfides (anilite, geerite, spionkopite, and yarrowite) (stage Ic). The tetra-auricupride inclusions are similar in shape...
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Journal Article
Journal: Geophysics
Published: 01 November 1997
Geophysics (1997) 62 (6): 1794–1796.
...-elastic material by postulating definite positive-energy density functions, Burridge and Keller (1981), Whitaker (1986a,b,c), and Pride et al. (1992) applied rigorous averaging techniques to derive the poro-elastic equations from a microscale. De Vries (1989) and Geerits (1996) used the averaging...
Journal Article
Journal: Economic Geology
Published: 01 December 1995
Economic Geology (1995) 90 (8): 2143–2155.
..., and distribution of Cu-S minerals indicate progressive alteration from chalcocite to covellite in the sequence chalcocite-djurleite-anilite-geerite-spionkopite-yarrowite-covellite. Bornite compositions plot on the Cu-Fe-S phase diagram along a line between ideal bornite (Cu 5 FeS 4 ) and Idaite (Cu 3 FeS 4...
Journal Article
Journal: The Leading Edge
Published: 01 March 2015
The Leading Edge (2015) 34 (3): 278–284.
.... This artifact can be corrected by “dispersion-correction” techniques ( Geerits and Tang, 2003 ). In general terms, these are model-based estimates of the true formation shear slowness by estimating the frequency at which the measurement is being taken. This can be the frequency with the peak energy...
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Journal Article
Journal: Geophysics
Published: 16 November 2015
Geophysics (2016) 81 (1): D35–D9.
...-correction methods have been developed to get the formation slowness from dispersive borehole guided waves ( Tang et al., 1995 ; Kimball, 1998 ; Geerits and Tang, 2003 ). These methods, because they handle the dispersion effects of the waveform data, are called dispersive processing methods. In contrast...
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Journal Article
Published: 01 September 2012
European Journal of Mineralogy (2012) 24 (5): 879–884.
... are known: Cu 2 S, chalcocite; Cu 1.97 S, djurleite; Cu 1.8 S, digenite; Cu 1.75 S, anilite; Cu l.6 S, geerite; Cu 1.39 S, spionkopite; Cu 1.12 S yarrowite; CuS, covellite; CuS 2 ( Pattrick et al ., 1997 ). Among them, only four are thermodynamically stable at environmental conditions, namely chalcocite...
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Journal Article
Journal: Geophysics
Published: 16 June 2010
Geophysics (2010) 75 (3): E153–E160.
... the array data. Conventional slowness processing of the dispersive array waveform data using semblance ( Kimball and Marzetta, 1984 ) is known to suffer from the dispersion effect and results in overestimating the slowness value ( Geerits and Tang, 2003 ). The dispersion characteristics of the array data...
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Journal Article
Journal: Geophysics
Published: 01 January 2003
Geophysics (2003) 68 (1): 118–126.
... exhibit a quite significant dispersion effect in the low-frequency range of interest. Fortunately, there exists a theoretical relationship between the wave's dispersion characteristics and the wave slowness derived from a nondispersive processing technique. This relationship is given by ( Geerits and Tang...
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Journal Article
Journal: Geophysics
Published: 11 August 2016
Geophysics (2016) 81 (5): D553–D560.
... not handle the dispersion effect of the waveform data, it usually gives a slowness value that is significantly higher than the true formation slowness ( Kimball, 1998 ; Geerits and Tang, 2003 ; Lee et al., 2016 ). Figure 4. Test of the joint inversion method using (a) synthetic LWD leaky-P and (c...
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Journal Article
Published: 01 August 2007
The Canadian Mineralogist (2007) 45 (4): 723–750.
...TABLE 9. SELECTED COMPOSITIONS OF COVELLITE, YARROWITE, SPIONKOITE AND GEERITE (?) ...
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Journal Article
Published: 01 April 2003
The Canadian Mineralogist (2003) 41 (2): 546–548.
... deposits, is not included in Table 7.3, whereas rare minerals such as geerite, spionkopite and yarrowite are listed. Also in Chapter 7, it is unclear to this reviewer why a liquid of 2.96 specific gravity should be used to concentrate As-bearing sulfides, whereas a liquid of 3.33 specific gravity...
Journal Article
Published: 01 June 2008
The Canadian Mineralogist (2008) 46 (3): 545–567.
... minerals include chal-copyrite, marcasite and isocubanite with rare troilite, wurtzite, galena and a new species, phase Y. In the Cu-rich massive sulfides (St. 1087), chalcopyrite, pyrite, bornite, chalcocite and non-stoichiometric species (digenite and geerite) were identified. Rare grains of copper-rich...
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Journal Article
Journal: Geophysics
Published: 19 February 2021
Geophysics (2021) 86 (2): D77–D91.
...., 1991 ; Tang and Cheng, 2004 ; Cheng, 2015 ). Conventional methods for dipole processing include time-domain beam-forming methods, e.g., STC ( Kimball and Marzetta, 1984 ) and model-based dispersion correction methods ( Brie and Saiki, 1996 ; Kimball, 1998 ; Geerits and Tang, 2003 ; Che et al...
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Journal Article
Published: 08 December 2023
Geochemistry: Exploration, Environment, Analysis (2023) 23 (4): geochem2023-035.
.... Chalcocite is a dominant Cu-bearing sulfide of the elaborated deposits ( Kucha 2003 , 2007 ; Pieczonka 2011 ). Bornite, digenite, covellite, djurleite, chalcopyrite, tennantite and half-bornite are other important Cu minerals, with minor idaite, geerite, yarrowite, spionkopite, energite, luzonite...
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Journal Article
Journal: Geophysics
Published: 28 December 2023
Geophysics (2024) 89 (2): D99–D112.
..., 1989 ; Tang, 2004 ; Zhang and Hu, 2014 ; Hirabayashi et al., 2017 ; Bennett, 2019 ; Geerits et al., 2021 ). Acoustic SWI can be used to detect various types of geologic structures such as formation interfaces ( Gong et al., 2015 ; Wang et al., 2015 ; Xu et al., 2019 ), 3D objects ( Xu et al...
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Journal Article
Published: 01 February 2008
Mineralogical Magazine (2008) 72 (1): 175–184.
... chalcocite by the leach, chalcocite is replaced sequentially by digenite (Cu 1.96 S), anilite (Cu 1.75 S), geerite (Cu 1.6 S), spionkopite (Cu 1.4 S), yarrowite (Cu 1.1 S), and, finally, covellite (CuS). Using a flow-through environmental cell loaded with chalcocite and exposed to ferric sulphate...
FIGURES
Journal Article
Published: 01 December 2013
European Journal of Mineralogy (2013) 25 (4): 569–578.
...: the chalcocite–digenite (Cu 2 S – Cu 1.75 S) series and the geerite–covellite (Cu 1.6 S – CuS) series. Often found in nature are covellite CuS, chalcocite Cu 2 S, djurleite Cu 1.934–1.965 S, digenite Cu 1.79–1.765 S, anilite Cu 1.75 S, spionkopite Cu 1.4 S, yarrowite Cu 1.125 S and geerite Cu 1.6 S ( Gablina...
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