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Aragonite-type to calcite-type in potassium nitrate

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Journal Article
Published: 01 August 1967
American Mineralogist (1967) 52 (7-8): 957–973.
...Briant L. Davis; Edwin H. Oshier Abstract An X-ray and optical study of over 30 single-crystal transformations of KNO 3 (II) ⇌ KNO 3 (I) involving the aragonite-type (II) and disordered calcite-type (I) structures, has resulted in the following observations: (a) at slow heating rates small crystals...
Journal Article
Published: 01 July 2018
European Journal of Mineralogy (2018) 30 (4): 711–720.
... distribution function analysis. Time-resolved fluorescence measurements are ideally suited to distinguish between calcitic and aragonitic local environments around the Eu-ions. We show that at ambient temperature calcite transforms at ∼10 GPa into an amorphous phase which locally has an aragonitic structure...
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Journal Article
Published: 11 May 2020
Journal of Sedimentary Research (2020) 90 (5): 449–467.
... little is known about seafloor diagenesis of polar carbonates. The intuitive conclusion, because the waters are cold and locally undersaturated with respect to calcite and aragonite, would be that they are destroyed, but they prevail as both Quaternary ( Domack 1988 ; Taviani et al. 1993 ; Taviani...
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Journal Article
Published: 01 April 2011
American Mineralogist (2011) 96 (4): 659–674.
... to volkonskoite, the veins are filled with calcite and minor amounts of gypsum, anhydrite, halite, apatite, and aragonite ( Gross 1977 ; Milodowski et al. 2001 ; Elie et al. 2007 ). Chromatite calcium chromate dehydrate hexavalent chromium mineralization Cr 6+ -bearing ettringite bentorite...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 1971
AAPG Bulletin (1971) 55 (4): 581–592.
... ); chloride and total salinity were measured on extract from a paste consisting of a 1:5 ratio of sediment and water; the pH was determined on these pastes. The techniques used for analysis of extracts and waters included (1) chloride titration, using silver nitrate with potassium chromate as indicator; (2...
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Journal Article
Journal: AAPG Bulletin
Published: 01 October 1938
AAPG Bulletin (1938) 22 (10): 1305–1411.
... lake levels sodium chloride has crystallized on the bottom. Cold weather results in temporary sodium sulphate precipitation. Three types of permanent sediments are most common, namely: the clays, oölites, and calcareous algal deposits. All come from the same source materials but varying mechanical...
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Journal Article
Published: 01 January 2000
Journal of the Geological Society (2000) 157 (1): 229–238.
... Recent Florida, USA Coastal marine sediments, <2 m depth Shelly quartz sand; aragonite, calcite, gypsum, pyrite Hutton & Taft 1965 Recent Coral Sea Basin Ocean‐bottom sediment cores (0–9 m); 4643 m water depth Plant debris van der Lingen 1979 Recent Sea of Japan Sea‐bed piston...
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Journal Article
Published: 01 January 2013
Reviews in Mineralogy and Geochemistry (2013) 77 (1): 73–121.
... to formation of hematite (Fe 2 O 3 ) (for more details, see Sel et al. 2012 ). Crystalline anhydrous metal carbonates, M(II)CO 3 exist either in rhombohedral (calcite type) or orthorhombic (aragonite-type) structure depending on the cation size ( Reeder 1983 ). Divalent cations smaller than Ca 2...
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Published: 01 January 2013
EISBN: 9780903056434
... partially replacing Ca. The calcite- aragonite polymorphism is brought about by the fact that the radius of the calcium ion is very close to the limiting value for the transition from the rhombohedral carbonate structure type to that of the orthorhombic carbonates. Calcite is the low-pressure polymorph...
Journal Article
Published: 04 April 2017
Geochemistry: Exploration, Environment, Analysis (2017) 17 (2): 101–112.
... Sand unit Vanadates  carnotite K 2 (UO 2 ) 2 (VO 4 ) 2 · 3H 2 O x x x  metatyuyamunite Ca(UO 2 ) 2 (VO 4 ) 2 · 3H 2 O x  rossite Ca(VO 3 ) 2 · 4H 2 O x x Carbonate  ankerite CaFe(CO 3 ) 2 x x  aragonite CaCO 3 x x  calcite CaCO 3 x x...
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Journal Article
Published: 01 January 2015
Reviews in Mineralogy and Geochemistry (2015) 80 (1): 1–23.
... of concern to evaluating fluid flow in sedimentary rocks and have been summarized in many books and review papers (e.g., Jamtveit and Yardley 1997 ; Parnell 1998 ). If the molar volume associated with a replacement process increases, as is the case of aragonite being replaced by calcite ( Perdikouri et...
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Journal Article
Published: 17 February 2011
Geological Magazine (2011) 148 (4): 655–669.
.... The predominant mineral is dolomite. (3) A third type of lamination comprises dolomite and gypsum laminae of irregular thickness, ranging from a few to 300 μm, accompanied by late diagenetic calcite and chert laminae ( Fig. 3 e). Plant fragments are common in this lithology. Figure 3 Laminated carbonate...
Journal Article
Published: 01 January 2005
Reviews in Mineralogy and Geochemistry (2005) 57 (1): 241–290.
... of potassium cations within the channel. In vishnevite of the type locality x = 1 ( Hassan and Grundy 1984 ), and the potassium cation is statistically distributed in the Na1 cation site. However, up to three K cations could occupy three symmetry related sites in the channel, which regularly alternate...
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Journal Article
Published: 01 November 2008
American Mineralogist (2008) 93 (11-12): 1693–1720.
... weathering of all surface rocks 10. Phanerozoic Era 0.542 Ga to present 4300+     a) biomineralization extensive skeletal biomineralization of calcite, aragonite, dolomite, hydroxylapatite, and opal     b) bio-weathering increased production of clay minerals, soils The third major...
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Journal Article
Published: 01 June 2012
Mineralogical Magazine (2012) 76 (3): 777–806.
... dissolution and precipitation is reviewed. In particular, radionuclide sequestration by microbially-mediated redox processes, calcite precipitation and phosphate mineralization is considered in detail. The literature included in the current review was also subjected to cluster analysis using self-organizing...
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Journal Article
Published: 28 September 2018
Quarterly Journal of Engineering Geology and Hydrogeology (2019) 52 (1): 83–98.
... carbonate minerals and leached ions e.g. Portlandite → CaCO 3 , Ca-silicate hydrates → CaCO 3  +  SiO 2 , Ca-aluminate hydrates → CaCO 3  + gibbsite (CaCO 3  = calcite, aragonite or vaterite depending on supersaturation of fluid). Short-term (less than 100 years) porosity decrease associated...
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Journal Article
Journal: GSA Bulletin
Published: 01 November 2010
GSA Bulletin (2010) 122 (11-12): 1731–1774.
... or phosphatic; the first calcitic taxa do not appear until either the late Nemakit-Daldynian or the beginning of the Tommotian (depending on the original mineralogy of the calcareous brachiopod Khasagtina and the first appearance of archaeocyaths at Selinde). No new acquisitions of aragonitic skeletons occur...
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Journal Article
Published: 01 May 2001
Journal of Sedimentary Research (2001) 71 (3): 372–379.
... study interval is composed of ∼ 70 cycles, most of which have cycle-capping calcretes. The dominant cement types in the study rocks are equant calcite crystals showing centripetal filling of pores indicating precipitation under phreatic conditions. The primary intergranular pores in some rocks received...
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Journal Article
Journal: Palynology
Published: 16 February 2021
Palynology (2021) 45 (S1): 1–110.
..., many pure limestones only require digestion with hydrochloric acid. Moreover, coal is typically simply oxidised using nitric acid or Schulze’s solution then reacted with dilute potassium hydroxide solution to produce organic substances which are then rinsed away using water. Traditional preparation...
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Journal Article
Published: 01 January 2002
Reviews in Mineralogy and Geochemistry (2002) 48 (1): 631–672.
... MPa ( Roy and Linnehan 1974 ). The pseudo-hexagonal structure of aragonite facilitates ease of conversion to the hexagonal unit cell of HAp. Conversion of calcite, another polymorph of calcium carbonate, under the same conditions produces tricalcium phosphate ( Zaremba et al. 1998 ). This process...
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