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1991 (1)
1980 (1)
1Author    F.C M DriessensRequires cookie*
 Title    Probable Phase Composition of the Mineral in Bone  
 Abstract    Formulas proposed for the mineral of bone were reviewed. Literature data were collected where Ca, P, Na, Mg and C 0 3 are determined in the same samples. These data were analyzed for their conformity to the above mentioned formulas. According to this analysis Mg is contained in a phase having the Ca/P of magnesium whitlockite within the limits o f error. Na is contained in a carbonated calcium phosphate phase which in analogy with synthetic systems must have the apatite structure. The Ca/P ratio o f the remaining "rest phase" is 2. This is based on the composi­ tion of 101 bone mineral samples taken from fishes, reptiles, amphibians, birds and mammals. The C 0 3 content of the bone samples agrees with the formula Ca8 (P 0 4)4 (C 0 3) (OH)2 • x H20 for the "rest phase" within the limits of experimental error. Such a compound has, however, not been found in synthetic systems. Human bone contains about 15% magnesium whitlockite, 25% of the Na and C 0 3 containing apatite and the rest is the carbonated calcium phosphate with Ca/P = 2. It is presumed that this compound has a structure similar to that o f octo calcium phosphate and that most o f the citrate ions which always occur in bone mineral samples are in­ corporated in that phase. 
  Reference    Z. Naturforsch. 35c, 357—362 (1980); received January 15 1980 
  Published    1980 
  Keywords    Bone, Mineral, Phase Composition, Citrate 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0357.pdf 
 Identifier    ZNC-1980-35c-0357 
 Volume    35 
2Author    A. B. Vassilikou-Dova, K. EftaxiasRequires cookie*
 Abstract    In clear, blue, transparent bipyramidal crystals of the rare mineral benitoite, BaTiSi30 9, para­ magnetic defects have been investigated by electron paramagnetic resonance at room temperature and 9.43 GHz. They are attributed to Sn3+ and Fe3 + . A pair of satellites recorded for a wide angular rage around B0 || c (~40°) and a relative intensity of ~ 13% to the central signal is most likely due to hyperfine interaction with 117Sn and 119Sn isotopes. Attempts to bleach the colour of the crystal were unsuccessful. 
  Reference    Z. Naturforsch. 46a, 579—582 (1991); received February 18 1991 
  Published    1991 
  Keywords    Electron paramagnetic resonance, Radiation defects, Minerals, Sn3 +, Fe3 + 
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 TEI-XML for    default:Reihe_A/46/ZNA-1991-46a-0579.pdf 
 Identifier    ZNA-1991-46a-0579 
 Volume    46