...Fabrizio Nestola; Anatoly V. Kasatkin; Sergey S. Potapov; Olga Ya. Chervyatsova; Arianna Lanza Abstract This study presents the first crystal-structure determination of natural MgCO 3 ·5H 2 O, mineral lansfordite, in comparison with previous structural works performed on synthetic analogues. A new...

...F igure 4. Optical images of lansfordite. ( a ) glassy and opaque white (dehydrated) crystals on black saguaro matrix. ( b ) clusters of glassy crystals and one dehydrated crystal The euhedral nature of the lansfordite is more easily seen on the white crystal. Scale bars = 800 μm. ...

...], hydromagnesite [Mg 5 (CO 3 ) 4 (OH) 2 ·4H 2 O], and less commonly lansfordite [MgCO 3 ·5H 2 O]. Textural relationships suggest that carbonate precipitates formed in situ after milling and deposition of tailings. Samples of efflorescent nesquehonite are characterized by δ 13 C values between 6.52 and 14.36 per...

... some alkaline lakes are dominated by magnesite, while others contain abundant hydrated Mg-carbonates (e.g., hydromagnesite). However, Mg/Ca ratios in solution have been linked to which Mg-carbonate phases precipitate (summarized by Zeyen et al. 2021 ). Hydrated Mg-carbonates include lansfordite (MgCO...

... at Clinton Creek, Yukon Territory, and Cassiar, British Columbia, Canada (Fig. 1 ) are actively fixing atmospheric CO 2 in mineral carbonates. The magnesium-carbonate minerals dypingite, hydromagnesite, nesquehonite, and more rarely, lansfordite, are forming in situ at the surface of the tailings piles...

... samples, to estimate the dissolved inorganic carbon (DIC) and the saturation state of selected solid phases. The saturation state of lansfordite (MgCO 3 ·5H 2 O) was determined in a parallel PHREEQC operation run using the LLNL database ( Wolery, 1992 ). The charge balance of all of the spring water...

... carbonate phases, which also include lansfordite 2 Always consult and cite the final, published document. See http:/www.minsocam.org or GeoscienceWorld This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America. The published version...

... be precipitated. Trace amounts of calcite are also predicted to be precipitated ( Fig. 6 ). In the evaporation experiments with the Zhabei Salt Lake brine at 0 °C performed by Gao et al. (2012) , the precipitation of borax and magnesium carbonate, possibly lansfordite (MgCO 3 ·5H 2 O), is also observed, based...

... ) Vibrational spectra of the hydrated carbonate minerals ikaite, monohydrocalcite, lansfordite and nesquehonite . Spectrochimica Acta Part A , 59 , 2231 – 2239 . Dahl , K. , and Buchardt , B. ( 2006 ) Monohydrocalcite in the Arctic Ikka Fjord, SW Greenland: First Reported Marine Occurrence...

... of hydrated-basic carbonates like nesquehonite, artinite, lansfordite and hydromagnesite in the area and the presence of the stable assemblage magnesite and quartz, indicate that temperatures of the order of 150°C were exceeded during carbonation of the peridot- ites in the present area. The absence...

... and Truesdell, 1991 ). Our approach is the first direct measurement of the α hydration sphere-water for calcium, and studies of mineral phases similar to ikaite [e.g., lansfordite (MgCO 3 ·5H 2 O) and hellyerite (NiCO 3 ·6H 2 O)] may validate quantum mechanistic models for the hydration of other divalent...

... 1.60 2.46 2.28 Lansfordite MgCO 3 ·5H 2 O 1:1 2.10 1.33 1.60 2.46 2.28 a Serpentine group minerals include antigorite, lizardite, and chrysotile. b Tonnes of diopside required to sequester 1 t of CO 2 in Mg-carbonate minerals of varying CO 2 :MgO ratio plus CaCO 3 · x H 2 O (e.g...

... ) barringtonite MgCO 3 ·2H 2 O, nesquehonite MgCO 3 ·3H 2 O, lansfordite MgCO 3 ·5H 2 O, hydromagnesite Mg 5 (CO 3 ) 4 (OH) 2 ·4H 2 O, dypingite Mg 5 (CO 3 ) 4 (OH) 2 ·5H 2 O, and artinite Mg 2 CO 3 (OH) 2 ·3H 2 O. Recent studies of non-aqueous solvents ( Xu et al. , 2013 ) reconsider this hypothesis...

.... magnesite, lansfordite, nesquehonite) than in minerals with lower CO 2 :MgO ratios (e.g. hydromagnesite, dypingite, artinite) ( F ig . 2 b ). Importantly, the mass ratio also depends strongly upon the hydration state of the carbonate mineral. The hydration state of the carbonate mineral impacts the water...