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![Evolution of primary itelmenite into mixtures of hydrated sulfates during t...]()
![( a ) General projection of the crystal structure of <span class="search-highlight">kröhnkite</span> (after Hawth...]()
![Three-dimensional perspective plot showing all diffractograms of <span class="search-highlight">kröhnkite</span> ...]()
![( a ) The holotype specimen of saranchinaite (light-blue) with euchlorine (...]()
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![A view of a polyhedral layer formed by vertically oriented <span class="search-highlight">kröhnkite</span>-type c...]()
![A view parallel to polyhedral layers with horizontally oriented <span class="search-highlight">kröhnkite</span>-t...]()
![A view parallel to polyhedral layers and along <span class="search-highlight">kröhnkite</span>-type chains for (a...]()
![Evolution of the mixture of hydrated sulfate phases, formed as a result of ...]()
![Crystal structure of kainite along the b axis ( a ). <span class="search-highlight">Kröhnkite</span>-type chain...]()
![Thermal expansion tensors for <span class="search-highlight">kröhnkite</span> (see Table 8 ) in the range of 20–...]()
![THERMODYNAMIC FUNCTIONS OF <span class="search-highlight">KRÖHNKITE</span>, CALCULATED FROM THE HEAT CAPACITY DAT...]()
![Projections of a single <span class="search-highlight">kröhnkite</span>-type chain (a) perpendicular and (b) para...]()
![The heteropolyhedral (0 1 0) sheet in laueite. Butlerite-type (B) and kröhn...]()
![The polyhedral and nodal representation of the structure of 1 along [100]...]()
![( a ) General projection of the crystal structure of ammoniovoltaite. Kröhn...]()
![Mixed tetrahedral-octahedral framework in a projection parallel to [0 0 1]....]()
![Back-scattered electron (BSE) images of the synthetic phases studied in thi...]()
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krohnkite
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Journal Article
Saranchinaite, Na 2 Cu(SO 4 ) 2 , a new exhalative mineral from Tolbachik volcano, Kamchatka, Russia, and a product of the reversible dehydration of kröhnkite, Na 2 Cu(SO 4 ) 2 (H 2 O) 2
Journal: Mineralogical Magazine
Published: 01 April 2018
Mineralogical Magazine (2018) 82 (2): 257–274.
... fumarole, Naboko Scoria Cone, Tolbachik volcano, Kamchatka, Russia. Its discovery and study has enabled the characterization of the thermal decomposition of kröhnkite and provided an insight into the high-temperature behaviour of other kröhnkite-type materials. Saranchinaite is monoclinic, P 2 1...
FIGURES
| View All (8)
Journal Article
Thermodynamic Properties and Phase Equilibria of the Secondary Copper Minerals Libethenite, Olivenite, Pseudomalachite, KrÖhnkite, Cyanochroite, and Devilline
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 01 September 2015
The Canadian Mineralogist (2015) 53 (5): 937–960.
... (PO 4 ) 2 (OH) 4 ], cyanochroite [K 2 Cu(SO 4 ) 2 · 6H 2 O], kröhnkite [Na 2 Cu(SO 4 ) 2 · 2H 2 O], and devilline [CaCu 4 (SO 4 ) 2 (OH) 6 · 3H 2 O] were determined by a combination of acid-solution calorimetry (enthalpy of formation) and relaxation calorimetry (heat capacity and entropy...
FIGURES
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Image
Evolution of primary itelmenite into mixtures of hydrated sulfates during t...
in Evolution of fumarolic anhydrous copper sulfate minerals during successive hydration/dehydration
> Mineralogical Magazine
Published: 02 February 2021
5 120 min, humidity 90% Stage 6 30 min, humidity 91% Stage 7 14 hours, humidity 94% itelmenite 100 ‘itelmenite’ 48 ‘hexahydrite’ 35 ‘kröhnkite’ 8 ‘pentahydrite’ 3 ‘sanderite’ 3 ‘starkeyite’ 2 ‘brucite’ 1 ‘kröhnkite’ 34 ‘itelmenite’ 31 ‘hexahydrite’ 24 ‘alpersite’ 6 ‘brucite’ 3
Image
( a ) General projection of the crystal structure of kröhnkite (after Hawth...
in Saranchinaite, Na 2 Cu(SO 4 ) 2 , a new exhalative mineral from Tolbachik volcano, Kamchatka, Russia, and a product of the reversible dehydration of kröhnkite, Na 2 Cu(SO 4 ) 2 (H 2 O) 2
> Mineralogical Magazine
Published: 01 April 2018
Fig. 6. ( a ) General projection of the crystal structure of kröhnkite (after Hawthorne and Ferguson, 1975 ) along the c axis (Na sites are marked by blue balls and H atoms are black). ( b ) [Cu(SO 4 ) 2 (H 2 O) 2 ] 2– chains in the structure of kröhnkite. ( c ) Arrangement of NaO 7
Image
Three-dimensional perspective plot showing all diffractograms of kröhnkite ...
in Saranchinaite, Na 2 Cu(SO 4 ) 2 , a new exhalative mineral from Tolbachik volcano, Kamchatka, Russia, and a product of the reversible dehydration of kröhnkite, Na 2 Cu(SO 4 ) 2 (H 2 O) 2
> Mineralogical Magazine
Published: 01 April 2018
Fig. 4. Three-dimensional perspective plot showing all diffractograms of kröhnkite over 5–60°2θ with increasing temperature. The dashed white line indicates transformation of kröhnkite into saranchinaite in the range of 170–200°C.
Image
( a ) The holotype specimen of saranchinaite (light-blue) with euchlorine (...
in Saranchinaite, Na 2 Cu(SO 4 ) 2 , a new exhalative mineral from Tolbachik volcano, Kamchatka, Russia, and a product of the reversible dehydration of kröhnkite, Na 2 Cu(SO 4 ) 2 (H 2 O) 2
> Mineralogical Magazine
Published: 01 April 2018
Tolbachik Fissure eruption; ( c ) greenish-blue crystals of kröhnkite from La Vendida mine; ( d ) dehydration and transformation of polycrystalline sample of ground kröhnkite into saranchinaite by ( e ) heating to 270°C and ( f ) subsequent re-hydration back into kröhnkite after 7 days in air at relative
Journal Article
Dondoellite, Ca 2 Fe(PO 4 ) 2 ·2H 2 O, a New Mineral Species Polymorphic with Messelite, from Rapid Creek, Yukon, Canada
Journal: The Canadian Mineralogist
Publisher: Mineralogical Association of Canada
Published: 21 October 2022
The Canadian Mineralogist (2022) 60 (5): 837–847.
... = 5.7431(2), c = 13.0107(5) Å, α = 98.772(2), β = 96.209(2), γ = 108.452(2)°, V = 378.71(2) Å 3 , and Z = 2. The crystal structure of dondoellite is characterized by isolated FeO 4 (H 2 O) 2 octahedra that are linked by corner-sharing with PO 4 tetrahedra to form so-called kröhnkite-type [Fe(PO 4 ) 2 (H 2...
FIGURES
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Image
A view of a polyhedral layer formed by vertically oriented kröhnkite-type c...
in Dondoellite, Ca 2 Fe(PO 4 ) 2 ·2H 2 O, a New Mineral Species Polymorphic with Messelite, from Rapid Creek, Yukon, Canada
> The Canadian Mineralogist
Published: 21 October 2022
Fig. 4. A view of a polyhedral layer formed by vertically oriented kröhnkite-type chains linked together by Ca 2+ or K + cations (spheres) in (a) collinsite ( Herwig & Hawthorne 2006 ), (b) wendwilsonite ( Kolitsch & Fleck 2006 ), (c) messelite ( Fleck & Kolitsch 2003 ), (d
Image
A view parallel to polyhedral layers with horizontally oriented kröhnkite-t...
in Dondoellite, Ca 2 Fe(PO 4 ) 2 ·2H 2 O, a New Mineral Species Polymorphic with Messelite, from Rapid Creek, Yukon, Canada
> The Canadian Mineralogist
Published: 21 October 2022
Fig. 5. A view parallel to polyhedral layers with horizontally oriented kröhnkite-type chains for (a) collinsite, (b) wendwilsonite, (c) messelite, (d) dondoellite, and (e) K 2 Mn(SO 4 ) 2 ·2H 2 O. The legend is the same as in Figure 4 .
Image
A view parallel to polyhedral layers and along kröhnkite-type chains for (a...
in Dondoellite, Ca 2 Fe(PO 4 ) 2 ·2H 2 O, a New Mineral Species Polymorphic with Messelite, from Rapid Creek, Yukon, Canada
> The Canadian Mineralogist
Published: 21 October 2022
Fig. 6. A view parallel to polyhedral layers and along kröhnkite-type chains for (a) collinsite, (b) wendwilsonite, (c) messelite, (d) dondoellite, and (e) K 2 Mn(SO 4 ) 2 ·2H 2 O. The legend is the same as in Figure 4 .
Image
Evolution of the mixture of hydrated sulfate phases, formed as a result of ...
in Evolution of fumarolic anhydrous copper sulfate minerals during successive hydration/dehydration
> Mineralogical Magazine
Published: 02 February 2021
+225 +250 ‘konyaite’ 68 ‘alpersite’ 29 ‘brucite’ 2 ‘epsomite’ 1 ‘konyaite’ 68 ‘Cu-pentahydrite’ 19 ‘hexahydrite’ 8 ‘kröhnkite’ 5 ‘kröhnkite’ 90 ‘konyaite’ 10 ‘kröhnkite’ 75 ‘konyaite’ 25 Amorphisation III +275 +300 +325 +350 +375 +400 MgSO 4 70
Image
Crystal structure of kainite along the b axis ( a ). Kröhnkite-type chain...
in Complex hydrogen bonding and thermal behaviour over a wide temperature range of kainite KMg(SO 4 )Cl⋅2.75H 2 O
> Mineralogical Magazine
Published: 01 February 2022
Fig. 2. Crystal structure of kainite along the b axis ( a ). Kröhnkite-type chains (b) (highlighted by the red dotted line) form layers (c) further interconnected via Mg-centred polyhedron into framework. Thermal expansion tensor of the structure of kainite ( d ), and its compressibility tensor
Image
Thermal expansion tensors for kröhnkite (see Table 8 ) in the range of 20–...
in Saranchinaite, Na 2 Cu(SO 4 ) 2 , a new exhalative mineral from Tolbachik volcano, Kamchatka, Russia, and a product of the reversible dehydration of kröhnkite, Na 2 Cu(SO 4 ) 2 (H 2 O) 2
> Mineralogical Magazine
Published: 01 April 2018
Fig. 7. Thermal expansion tensors for kröhnkite (see Table 8 ) in the range of 20–200°C.
Image
THERMODYNAMIC FUNCTIONS OF KRÖHNKITE, CALCULATED FROM THE HEAT CAPACITY DAT...
in Thermodynamic Properties and Phase Equilibria of the Secondary Copper Minerals Libethenite, Olivenite, Pseudomalachite, KrÖhnkite, Cyanochroite, and Devilline
> The Canadian Mineralogist
Published: 01 September 2015
TABLE 10. THERMODYNAMIC FUNCTIONS OF KRÖHNKITE, CALCULATED FROM THE HEAT CAPACITY DATA MEASURED IN THIS STUDY
Image
Projections of a single kröhnkite-type chain (a) perpendicular and (b) para...
in Preparation and characterization of Na 1.5 K 0.5 Ca 6 Si 4 O 15 (Na 1.5 K 0.5 Ca 6 [SiO 4 ] 2 [Si 2 O 7 ]) and Na 1.41 K 0.19 Ca 2.20 Si 2 O 7 : two new phases in the system Na 2 O–K 2 O–CaO–SiO 2
> European Journal of Mineralogy
Published: 01 September 2018
Fig. 4 Projections of a single kröhnkite-type chain (a) perpendicular and (b) parallel to the chain direction [0 0 1].
Image
The heteropolyhedral (0 1 0) sheet in laueite. Butlerite-type (B) and kröhn...
Published: 01 April 2015
F ig . 3. The heteropolyhedral (0 1 0) sheet in laueite. Butlerite-type (B) and kröhnkite-type (K) chains are indicated by arrows.
Image
![The polyhedral and nodal representation of the structure of 1 along [100]...](https://gsw.silverchair-cdn.com/gsw/Content_public/Journal/eurjmin/30/4/10.1127_ejm_2018_0030-2749/2/s_ejm_30_4_0785_0800_dordevic_2749_online_fig4.jpeg?Expires=2147483647&Signature=qbicwYNmcTbN~LdBSf7aPx13OUH0R6LWbzKn5fmbU4KOFpKwbIGa-FhOj5Tyeb9Qyz2xm6gpXRMw8oI6bfJI-LIPGG64GnO6cWX5OumvKJGPE9Zd6hw2yjPHud3fcUC9cKLjKj2dDb8Xr6ZNVhE-m7b649gbHEfliM8YXkZV370UMZJhCMbhHcR7y~vMcCbEixXzxodJQvevf1JD-ag5rHdMNGtvg~-xk-PrZOHWcE82BNbbNgb67QvCpD4Y~idoN5jM4nZwpeBh8Fg7Yx0OyhgXh~hbL7SO~ZnCwnw1liBgmha8NSirwX32TeYosabMheVByO-adpES3Oy3B01KmQ__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
The polyhedral and nodal representation of the structure of 1 along [100]...
in Three new Sr-bearing arsenates, hydrothermally synthesized in the system SrO– M O–As 2 O 5 –H 2 O ( M 2+ = Mg, Cu, Zn)
> European Journal of Mineralogy
Published: 01 July 2018
Fig. 4 The polyhedral and nodal representation of the structure of 1 along [100]. (a) The Mg1O 4 (H 2 O) 2 octahedra alternating with As1O 4 tetrahedra in the kröhnkite-type chains (composition [Mg(AsO 4 ) 2 (H 2 O) 2 ] 4- ). The large green circles are Sr atoms and the small red and black
Image
( a ) General projection of the crystal structure of ammoniovoltaite. Kröhn...
in Ammoniovoltaite, (NH 4 ) 2 Fe 2+ 5 Fe 3+ 3 Al(SO 4 ) 12 (H 2 O) 18 , a new mineral from the Severo-Kambalny geothermal field, Kamchatka, Russia
> Mineralogical Magazine
Published: 01 October 2018
Fig. 8. ( a ) General projection of the crystal structure of ammoniovoltaite. Kröhnkite-type chains are highlighted and Al(H 2 O) 6 groups are omitted (designated by blue circles) for clarity. ( b ) Three-dimensional framework of ammoniovoltaite.
Image
![Mixed tetrahedral-octahedral framework in a projection parallel to [0 0 1]....](https://gsw.silverchair-cdn.com/gsw/Content_public/Journal/eurjmin/30/5/10.1127_ejm_2018_0030-2767/7/s_ejm_30_5_0957_0966_kahlenberg_2767_online_fig3.jpeg?Expires=2147483647&Signature=OVnTltDRsKl2fp8Wq1H7qwYlr4ZDnTQZHc4IXo4SdQD8L5667RF~3-v5odcMCK5MEZ-AZ38PROY1qF0dawbOzDso5YwgSK-XYba4esR7Uo86NH2j1bz9wqteNSC~jec3z2ZhKD250rLtY7YsGDUW4Asdmc3-q1ZPdHvMUN3jItNFevFrPLi4z00IuuJakoEeRX4PC5el-Q3V~JUWspl3AU9D51mJiq1smMyFLrnqsT~9Tzw8b0s~xhuUom6v8a12U0kVxxksAaHhEp2dtZ0SyotwpFkYpCq1n14tOe9Uma3rAoyugVOwj4T~X~IcsuqStH0yYW75XvQYJXsdG5~hRg__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Mixed tetrahedral-octahedral framework in a projection parallel to [0 0 1]....
in Preparation and characterization of Na 1.5 K 0.5 Ca 6 Si 4 O 15 (Na 1.5 K 0.5 Ca 6 [SiO 4 ] 2 [Si 2 O 7 ]) and Na 1.41 K 0.19 Ca 2.20 Si 2 O 7 : two new phases in the system Na 2 O–K 2 O–CaO–SiO 2
> European Journal of Mineralogy
Published: 01 September 2018
Fig. 3 Mixed tetrahedral-octahedral framework in a projection parallel to [0 0 1]. Layers parallel to (0 1 0) containing kröhnkite-type chains can be identified. These sheets are arranged in an …ABAB… stacking sequence.
Image
Back-scattered electron (BSE) images of the synthetic phases studied in thi...
in Thermodynamic Properties and Phase Equilibria of the Secondary Copper Minerals Libethenite, Olivenite, Pseudomalachite, KrÖhnkite, Cyanochroite, and Devilline
> The Canadian Mineralogist
Published: 01 September 2015
Fig. 2. Back-scattered electron (BSE) images of the synthetic phases studied in this work. (a) Kröhnkite crystals with thénardite impurity (minute white crystals with rhombic outline); (b) libethenite; (c) olivenite; (d) pseudomalachite. The cyanochroite crystals are too large to be imaged
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