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![RH- T phase diagram of <span class="search-highlight">rhomboclase</span>. Diamond spot represents the dehydratio...]()
![( a ) Low-temperature heat capacity data for <span class="search-highlight">rhomboclase</span>, showing the magne...]()
![Synchrotron X-ray-diffraction pattern (taken at room temperature) of the mi...]()
![T -resolved synchrotron XRD data showing the thermal decomposition of rhomb...]()
![Experimental (symbols) and calculated (curves) solubility of several ferric...]()
![]()
![]()
![]()
![XRD data showing the hydration process of M-Fe 2 (SO 4 ) 3 at 53% RH. Seve...]()
![In situ XRD data showing the dehydration of the sample from 62% RH bottle a...]()
![(a) The octahedral–tetrahedral sheet in the minerals of the alunite supergr...]()
![]()
![]()
![]()
![Backscattered electron images of the <span class="search-highlight">rhomboclase</span> sample used for calorimetr...]()
![2 H MAS NMR spectrum of <span class="search-highlight">rhomboclase</span> with an expansion of the region for the...]()
![The Raman spectra of <span class="search-highlight">rhomboclase</span> at 10.5 mW (a), coquimbite at 10.5 mW (b),...]()
![Na-jarosite ( a – c ), <span class="search-highlight">rhomboclase</span> ( d – f ), and szomolnokite ( g – i ) di...]()
![Selected sheets from sulfate structures; ( a ) <span class="search-highlight">rhomboclase</span>; ( b ) guildite;...]()
![TG and DSC data of <span class="search-highlight">rhomboclase</span>.]()
1-20 OF 161 RESULTS FOR
rhomboclase
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1
Journal Article
Thermodynamics and crystal chemistry of rhomboclase, (H 5 O 2 )Fe(SO 4 ) 2 ·2H 2 O, and the phase (H 3 O)Fe(SO 4 ) 2 and implications for acid mine drainage
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 March 2017
American Mineralogist (2017) 102 (3): 643–654.
.... For geochemical modeling of the AMD systems, reliable thermodynamic data for these phases are needed. In this work, we have determined thermodynamic data for the most acidic sulfates rhomboclase [(H 5 O 2 )Fe(SO 4 ) 2 ·2H 2 O or (H 3 O)Fe(SO 4 ) 2 ·3H 2 O] and the phase (H 3 O)Fe(SO 4 ) 2 . The actual...
FIGURES
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Journal Article
(H 3 O)Fe(SO 4 ) 2 formed by dehydrating rhomboclase and its potential existence on Mars
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 October 2010
American Mineralogist (2010) 95 (10): 1408–1412.
...Wenqian Xu; John B. Parise; Jonathan Hanson Abstract Rhomboclase, (H 5 O 2 )Fe(SO 4 ) 2 ·2H 2 O, transforms to a solid crystalline phase, (H 3 O)Fe(SO 4 ) 2 , upon dehydration. The structure of (H 3 O)Fe(SO 4 ) 2 is found to be the same as a recently reported structure determined from single...
FIGURES
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Journal Article
THE ATOMIC STRUCTURE OF (H 3 O)Fe 3+ (SO 4 ) 2 AND RHOMBOCLASE, (H 5 O 2 )Fe 3+ (SO 4 ) 2 ·2H 2 O
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 June 2009
The Canadian Mineralogist (2009) 47 (3): 625–634.
... causes the array of oxygen atoms formed by the apices of the sulfate groups that bond to the hydronium groups to be farther apart. The adjustment of the hydrogen bonding to this change results in the lower symmetry. The crystal structure of rhomboclase, (H 5 O 2 )Fe 3+ (SO 4 ) 2 ·2H 2 O, has been refined...
FIGURES
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Journal Article
Thermodynamic properties and crystal structure refinement of ferricopiapite, coquimbite, rhomboclase, and Fe 2 (SO 4 ) 3 (H 2 O) 5
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 March 2006
European Journal of Mineralogy (2006) 18 (2): 175–186.
...Juraj MAJZLAN; Alexandra NAVROTSKY; R. Blaine McCLESKEY; Charles N. ALPERS Abstract Enthalpies of formation of ferricopiapite [nominally Fe 4.67 (SO 4 ) 6 (OH) 2 (H 2 O) 20 ], coquimbite [Fe 2 (SO 4 ) 3 (H 2 O) 9 ], rhomboclase [(H 3 O)Fe(SO 4 ) 2 (H 2 O) 3 ], and Fe 2 (SO 4 ) 3 (H 2 O) 5 were...
FIGURES
Image
RH- T phase diagram of rhomboclase. Diamond spot represents the dehydratio...
in (H 3 O)Fe(SO 4 ) 2 formed by dehydrating rhomboclase and its potential existence on Mars
> American Mineralogist
Published: 01 October 2010
F igure 4. RH- T phase diagram of rhomboclase. Diamond spot represents the dehydration (RH, T ) of rhomboclase; square represents the hydration (RH, T ) of (H 3 O)Fe(SO 4 ) 2 ; triangle represents the deliquescence (RH, T ) of rhomboclase.
Image
( a ) Low-temperature heat capacity data for rhomboclase, showing the magne...
in Thermodynamics and crystal chemistry of rhomboclase, (H 5 O 2 )Fe(SO 4 ) 2 ·2H 2 O, and the phase (H 3 O)Fe(SO 4 ) 2 and implications for acid mine drainage
> American Mineralogist
Published: 01 March 2017
Figure 3 ( a ) Low-temperature heat capacity data for rhomboclase, showing the magnetic transition in this phase. ( b ) Difference between the relaxation calorimetry (PPMS) and differential scanning calorimetry (DSC) measurements for the rhomboclase sample.
Image
Synchrotron X-ray-diffraction pattern (taken at room temperature) of the mi...
in AN X-RAY- AND NEUTRON-DIFFRACTION STUDY OF SYNTHETIC FERRICOPIAPITE, Fe 14/3 (SO 4 ) 6 (OD,OH) 2 (D 2 O,H 2 O) 20 , AND AB INITIO CALCULATIONS ON THE STRUCTURE OF MAGNESIOCOPIAPITE, MgFe 4 (SO 4 ) 6 (OH) 2 (H 2 O) 20
> The Canadian Mineralogist
Published: 01 October 2006
F ig . 2. Synchrotron X-ray-diffraction pattern (taken at room temperature) of the mixture of ferricopiapite and rhomboclase, with the calculated and difference plot from the Rietveld refinement. The upper row of tickmarks shows the calculated position of rhomboclase peaks, the lower row
Image
T -resolved synchrotron XRD data showing the thermal decomposition of rhomb...
in (H 3 O)Fe(SO 4 ) 2 formed by dehydrating rhomboclase and its potential existence on Mars
> American Mineralogist
Published: 01 October 2010
F igure 2. T -resolved synchrotron XRD data showing the thermal decomposition of rhomboclase to (H 3 O)Fe(SO 4 ) 2 then to monoclinic Fe 2 (SO 4 ) 3 . Some reflections are indexed for rhomboclase at the bottom, (H 3 O)Fe(SO 4 ) 2 in the middle, and monoclinic Fe 2 (SO 4 ) 3 at the top.
Image
Experimental (symbols) and calculated (curves) solubility of several ferric...
in Thermodynamics and crystal chemistry of rhomboclase, (H 5 O 2 )Fe(SO 4 ) 2 ·2H 2 O, and the phase (H 3 O)Fe(SO 4 ) 2 and implications for acid mine drainage
> American Mineralogist
Published: 01 March 2017
Figure 6 Experimental (symbols) and calculated (curves) solubility of several ferric sulfates. Circles = this study, room temperature; squares = Baskerville and Cameron (1935) , room temperature; crosses = Wirth and Bakke (1914) , room temperature. Charges that precipitated rhomboclase
Journal Article
THE ROLE OF EFFLORESCENT SULFATES IN THE STORAGE OF TRACE ELEMENTS IN STREAM WATERS POLLUTED BY ACID MINE-DRAINAGE: THE CASE OF PEÑA DEL HIERRO, SOUTHWESTERN SPAIN
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 December 2006
The Canadian Mineralogist (2006) 44 (6): 1431–1446.
...). The precipitates consist of Fe, Mg and Al sulfates, rich in trace elements ( e.g. , >1000 ppm Cu and Zn, >500 ppm As and Co, up to 28 ppm Cd). The mineralogy is dominated by coquimbite, magnesiocopiapite and pickeringite, and occasionally, rhomboclase, alpersite, epsomite, hexahydrite and starkeyite...
FIGURES
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Image
XRD data showing the hydration process of M-Fe 2 (SO 4 ) 3 at 53% RH. Seve...
in Humidity-induced phase transitions of ferric sulfate minerals studied by in situ and ex situ X-ray diffraction
> American Mineralogist
Published: 01 November 2009
F igure 5. XRD data showing the hydration process of M-Fe 2 (SO 4 ) 3 at 53% RH. Several peaks were marked with the initials of corresponding mineral names, either followed by the index numbers in parentheses or not. F = Ferricopiapite; R = Rhomboclase; K = Kornelite; P = Paracoquimbite
Image
In situ XRD data showing the dehydration of the sample from 62% RH bottle a...
in Humidity-induced phase transitions of ferric sulfate minerals studied by in situ and ex situ X-ray diffraction
> American Mineralogist
Published: 01 November 2009
F igure 9. In situ XRD data showing the dehydration of the sample from 62% RH bottle at 53% RH. Four lines indicate 0, 12, 36, and 60 h stay at 53% RH from bottom to top. Percentages are the weight proportions of each phase estimated from Rietveld refinement. F = Ferricopiapite; R = Rhomboclase
Image
(a) The octahedral–tetrahedral sheet in the minerals of the alunite supergr...
Published: 01 January 2000
of kornelite projected down [001]; (g) the [ M ( T Ø 4 ) 2 Ø 2 ] sheet in rhomboclase; (h) the intersheet species and hydrogen-bond network in rhomboclase.
Journal Article
Temperature and humidity effects on ferric sulfate stability and phase transformation
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 February 2012
American Mineralogist (2012) 97 (2-3): 378–383.
... 4.67 (SO 4 ) 6 (OH) 2 ·20H 2 O] and rhomboclase [(H 5 O 2 )Fe(SO 4 ) 2 ·2H 2 O] first crystallized from the starting solution, and then combined to form kornelite [Fe 2 (SO 4 ) 3 ·7.5H 2 O] at 42% RH or to paracoquimbite [Fe 2 (SO 4 ) 3 ·9H 2 O] at 46–47% RH. At 2 °C and 34–43% RH, initially...
FIGURES
| View All (6)
Image
Backscattered electron images of the rhomboclase sample used for calorimetr...
in Thermodynamics and crystal chemistry of rhomboclase, (H 5 O 2 )Fe(SO 4 ) 2 ·2H 2 O, and the phase (H 3 O)Fe(SO 4 ) 2 and implications for acid mine drainage
> American Mineralogist
Published: 01 March 2017
Figure 1 Backscattered electron images of the rhomboclase sample used for calorimetry in this study. The droplets on the crystals are the result of outgassing in vacuum of the scanning electron microscope.
Image
2 H MAS NMR spectrum of rhomboclase with an expansion of the region for the...
in Thermodynamics and crystal chemistry of rhomboclase, (H 5 O 2 )Fe(SO 4 ) 2 ·2H 2 O, and the phase (H 3 O)Fe(SO 4 ) 2 and implications for acid mine drainage
> American Mineralogist
Published: 01 March 2017
Figure 7 2 H MAS NMR spectrum of rhomboclase with an expansion of the region for the isotropic shifts (inset).
Image
The Raman spectra of rhomboclase at 10.5 mW (a), coquimbite at 10.5 mW (b),...
in THE RAMAN STUDY OF WEATHERING MINERALS FROM THE CORANDA-HONDOL OPEN PIT (CERTEJ GOLD-SILVER DEPOSIT) AND THEIR PHOTOCHEMICAL DEGRADATION PRODUCTS UNDER LASER IRRADIATION
> The Canadian Mineralogist
Published: 15 June 2015
F ig . 1. The Raman spectra of rhomboclase at 10.5 mW (a), coquimbite at 10.5 mW (b), mikasaite at 14 mW (c), copiapite at 7.4 mW (d), ferricopiapite at 7.4 mW (e), intermediate phases between copiapite (ferricopiapite) and mikasaite (f, g), and mikasaite at 18.4 mW (h).
Image
Na-jarosite ( a – c ), rhomboclase ( d – f ), and szomolnokite ( g – i ) di...
Published: 01 August 2014
Figure 5 Na-jarosite ( a – c ), rhomboclase ( d – f ), and szomolnokite ( g – i ) diffuse reflectance spectra and optical constants k (λ) and n (λ). Dashed lines represent upper and lower bounds on estimated k (λ) and n (λ).
Image
Selected sheets from sulfate structures; ( a ) rhomboclase; ( b ) guildite;...
Published: 01 August 2014
F ig . 30. Selected sheets from sulfate structures; ( a ) rhomboclase; ( b ) guildite; ( c ) slavikite; ( d ) alunite; ( e ) goldichite; ( f ) natrocalcite; ( g ) wroewolfeite; ( h ) gordaite. Legend as in Fig. 10 , green = (Cuφ 6 ) and (Znφ 4 ) polyhedra.
Image
TG and DSC data of rhomboclase.
in (H 3 O)Fe(SO 4 ) 2 formed by dehydrating rhomboclase and its potential existence on Mars
> American Mineralogist
Published: 01 October 2010
F igure 1. TG and DSC data of rhomboclase.
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