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calcium phosphates

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Journal Article
Published: 01 October 2012
European Journal of Mineralogy (2012) 24 (6): 1031-1045.
...Carmen Vázquez-Calvo; Monica Álvarez de Buergo; Rafael Fort; Asuncion de los Rios Abstract Calcium oxalate patinas have been studied on historical monuments for years. In some cases they are associated with calcium phosphate, the presence of which has received contrasted attention and may have been...
FIGURES | View All (13)
Journal Article
Published: 01 April 1943
American Mineralogist (1943) 28 (4): 215-232.
...Clifford Frondel Abstract The principal constituent of insular phosphate rock is a member of the apatite series, usually a carbonate-hydroxyl-fluorine-apatite. Collophane of Sandberger (1870) and Rogers (1917, 1922) is not an amorphous species distinct from apatite. X -ray study of insular...
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<b>Calcium</b> <b>phosphates</b> recovered from the wastewater works at Geestmerambacht: ...
Published: 01 October 2001
F ig . 2. Calcium phosphates recovered from the wastewater works at Geestmerambacht: ( a ) a seed covered with precipitated Ca phosphate; ( b ) the surface of a quartz sand seed with virtually no phosphate precipitated, except for the top right corner; ( c ) the precipitated Ca phosphate shows
Journal Article
Published: 01 March 2001
European Journal of Mineralogy (2001) 13 (2): 361-376.
... by an arrangement of hexagonal crystallites of calcium phosphate, with sizes ranging between 0.1 and 1 μm in diameter, of the same shape and size as those observed in mature dental enamel. The phosphate crystallites are wrapped in Fe-Al-Si-rich poorly crystalline phases (authigenic Fe-rich smectite plus Fe-Si-Al...
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Journal Article
Published: 01 November 2014
American Mineralogist (2014) 99 (11-12): 2320-2327.
...S. Mahboobeh Hosseini; Christophe Drouet; Ahmed Al-Kattan; Alexandra Navrotsky Abstract Lanthanides “Ln” (rare earths) are critical elements found in natural minerals such as calcium phosphate apatites, in sedimentary and igneous settings as well as in skeletal diagenesis. From a medical point...
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Journal Article
Published: 01 August 2010
American Mineralogist (2010) 95 (8-9): 1224-1236.
...Olaf Borkiewicz; John Rakovan; Christopher L. Cahill Abstract Formation of hydroxylapatite through the precipitation and evolution of calcium phosphate precursor phases under varying conditions of temperature (25–90 °C), pH (6.5–9.0), and calcium to phosphorus ratio (1.0, 1.33, 1.5, and 1.67...
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Compositions along the <b>calcium</b> <b>phosphate</b> apatite OH-Cl binary studied in th...
Published: 01 August 2016
Figure 1 Compositions along the calcium phosphate apatite OH-Cl binary studied in this work.
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Depiction of reversal of anion column in OH-Cl binary <b>calcium</b> <b>phosphate</b> apa...
Published: 01 August 2016
Figure 4 Depiction of reversal of anion column in OH-Cl binary calcium phosphate apatites with Cl > OH. The depicted sequence provides sufficient anion-anion distances and allows reversal of anion sequence to preserve P 6 3 / m symmetry.
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Depiction of reversal of anion column in OH-Cl binary <b>calcium</b> <b>phosphate</b> apa...
Published: 01 August 2016
Figure 5 Depiction of reversal of anion column in OH-Cl binary calcium phosphate apatites with OH > Cl. The depicted sequence provides sufficient anion-anion distances and allows reversal of anion sequence to preserve P 6 3 / m symmetry.
Image
Depiction of reversal of anion column in OH-Cl binary <b>calcium</b> <b>phosphate</b> apa...
Published: 01 August 2016
Figure 6 Depiction of reversal of anion column in OH-Cl binary calcium phosphate apatites with OH ≈ Cl. The depicted sequence provides sufficient anion-anion distances and allows reversal of anion sequence to preserve P 6 3 / m symmetry.
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Calculated solubility isotherms of <b>calcium</b> <b>phosphate</b> phases in the system C...
Published: 01 August 2010
F igure 1. Calculated solubility isotherms of calcium phosphate phases in the system Ca(OH) 2 -H 3 PO 4 -H 2 O at 37 °C. Phases present on the diagram: hydroxylapatite, HAp [Ca 10 (PO 4 ) 6 (OH) 2 ]; tricalcium phosphate, TCP [Ca 3 (PO 4 ) 2 ]; octacalcium phosphate, OCP [Ca 4 H(PO 4 ) 3
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Diagram of the atomic structure of amorphous <b>calcium</b> <b>phosphate</b> seen as indi...
Published: 01 January 2006
Figure 24. Diagram of the atomic structure of amorphous calcium phosphate seen as individual spheres 300–1000 A in size. Spheres are composed of randomly arranged Ca 9 (PO 9 ) 6 clusters. [Gratefully used with permission of Springer Verlag from the original supplied by Dr. Aaron Posner. from
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Solubility isotherms of <b>calcium</b> <b>phosphate</b> phases in the system Ca(OH) 2 -H ...
Published: 01 January 2002
Figure 1. Solubility isotherms of calcium phosphate phases in the system Ca(OH) 2 -H 3 PO 4 -H 2 O at 37°C. DCPD is dicalcium phosphate dihydrate, brushite; DCPA is dicalcium phosphate anhydrous, monetite; OCP is octacalcium phosphate; β-TCP is β-tricalcium phosphate; and OHAp is hydroxylapatite
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HRTEM image of an amorphous <b>calcium</b> <b>phosphate</b> substance, which forms spheru...
Published: 01 March 2001
Fig. 9. HRTEM image of an amorphous calcium phosphate substance, which forms spherules and ellipsoids of 2–5 nm in diameter (arrow), and structureless films and “clouds”. In the upper part of this image one small francolite crystal shows lattice fringes at 8.2 Å that corresponds to the d
Journal Article
Published: 01 August 2016
American Mineralogist (2016) 101 (8): 1783-1791.
...Figure 1 Compositions along the calcium phosphate apatite OH-Cl binary studied in this work. ...
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Journal Article
Published: 01 October 1996
Journal of the Geological Society (1996) 153 (5): 665-668.
...DEREK E. G. BRIGGS; PHILIP R. WILBY Abstract Authigenic minerals play an important role in the preservation of most soft-bodied fossils. The greatest detail is preserved in apatite (calcium phosphate) but its precipitation is usually inhibited by the high concentrations of HCO 3 - in aqueous...
Journal Article
Published: 01 January 2002
Reviews in Mineralogy and Geochemistry (2002) 48 (1): 427-453.
...Figure 1. Solubility isotherms of calcium phosphate phases in the system Ca(OH) 2 -H 3 PO 4 -H 2 O at 37°C. DCPD is dicalcium phosphate dihydrate, brushite; DCPA is dicalcium phosphate anhydrous, monetite; OCP is octacalcium phosphate; β-TCP is β-tricalcium phosphate; and OHAp is hydroxylapatite...
FIGURES
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2423(29)
... ). Archean phosphorites or phosphate sediments are unknown. Calcium phosphate deposition began in the Early Proterozoic in very minor occurrences except for the North Korean deposit and the stromatolitic deposits in India. In the Neoproterozoic, specifically in the Ediacaran, the first large-scale deposits...
Journal Article
Journal: PALAIOS
Published: 01 October 1997
PALAIOS (1997) 12 (5): 420-438.
... of the cuticle, decay of the soft-tissues, and disarticulation and fragmentation of the exoskeleton. Two categories of mineralization occurred; the precipitation of crystal bundles of calcium carbonate, and the replacement of soft-tissue and cuticle in calcium phosphate. Calcium carbonate formed as: (1) crystal...
Journal Article
Published: 01 January 1963
Bulletin de la Société Géologique de France (1963) S7-V (7): 1076-1084.
... of Santonian through Eocene age, as well as in Holocene deposits in the southern part of the region. Santonian phosphates are limited to the central part of the southern Palmyride chain. Campanian phosphorites are well-developed and represented by rocks primarily composed of calcium phosphate. The major...