Lepidocrocite, an Apatite Mineral, and Magnetite in Teeth of Chitons (Polyplacophora)

  title={Lepidocrocite, an Apatite Mineral, and Magnetite in Teeth of Chitons (Polyplacophora)},
  author={H. Lowenstam},
  pages={1373 - 1375}
X-ray diffraction patterns show that the mature denticles of three extant chiton species are composed of the mineral lepidocrocite and an apatite mineral, probably francolite, in addition to magnetite. Each of the three minerals forms a discrete microarchitectural unit of the chiton denticles. This is the first indication that lepidocrocite is precipitated by marine organisms and an apatite mineral by chitons. 
Mineralization and magnetization of chiton teeth : Paleomagnetic, sedimentologic, and biologic implications of organic magnetite
Abstract Magnetite precipitation and tooth formation in chitons (Polyplacophora) proceeds through a biochemically-controlled reduction of the mineral ferrihydrite. Resulting crystals of single-domainExpand
Biomineralization Processes of the Radula Teeth of Chitons
Magnetite was first identified as a biogenic mineral in the radula teeth of chitons (Mollusca, Polyplacophora) (Lowenstam, 1962). The caps of mature major lateral teeth are composed in part ofExpand
Magnetite in the radular teeth of chitons
To understand the process by which living organisms synthesize magnetite, we measured the Mössbauer spectra on the teeth at different maturation stages along the radula of chitons. Our results showExpand
Biologic Precipitation of Fluorite
The occurrence of fluorite in mysid statoliths confirms the earlier interpretations based on insufficient documentation, andfixation of fluorine in hard tissues of marine invertebrates is extensive in the shelf seawaters and minor in the bathyal zone of the oceans. Expand
Apatite Mineralization in Teeth of the Chiton Acanthopleura echinata
Abstract. Raman spectroscopy has been used to demonstrate, for the first time, that calcium mineralization in the core of the major lateral teeth of the chiton Acanthopleura echinata takes place asExpand
Transformation of Amorphous Calcium Phosphate to Crystalline Dahillite in the Radular Teeth of Chitons
A comparison of infrared spectra from individual teeth along the radula of a chiton (Polyplacophora, Mollusca) shows that the first-formed calcium phosphate mineral is amorphous. Over a period ofExpand
Non-stoichiometric magnetite and maghemite in the mature teeth of the chitonAcanthopleura hirtosa
Mature radula pieces from the chitonAcanthopleura hirtosa were studied using Mössbauer spectroscopy. The magnetite present in the radulae was found to have a distribution of Verwey transitionExpand
It is suggested that ferritin serves to deliver iron to rapidly mineralizing radula tissue in a complex sequence of mineralization steps in the tooth denticles of chitons (Polyplacophora), a group of marine molluscs. Expand
Minerals of the Radular Apparatus of Falcidens sp. (Caudofoveata) and the Evolutionary Implications for the Phylum Mollusca.
The discovery of amorphous iron oxide and hydroxyapatite in the highly modified radular apparatus of Falcidens sp. Expand
Amorphous calcium phosphate in the stylets produced by a marine worm (Nemertea)
Electron microprobe analyses of the calcified stylets produced by the nemertean wormAmphiporus formidabilis reveal large calcium and phosphorus peaks. IR spectroscopy and X-ray diffraction indicateExpand


Goethite in Radular Teeth of Recent Marine Gastropods
The x-ray diffraction patterns of the denticle material from several species show that the material consists of the mineral goethite. This is the first indication that goethite is precipitated byExpand
Dahllite Identified as a Constituent of Prodissoconch I of Pinctada martensii (Dunker)
Werner (1) reported that prodissoconchs (larval shells) of Mytilus edulis L., Macoma baltica L., Zirphaea crispata L., and other species are composed of two parts, prodissoconch I (prod. I), andExpand
Lamont Natural Radiocarbon Measurements III
It has been brought to our attention that wedid not designate the correct collectors of severalof the samples reported in "Lamont radiocarbonmeasurements III" [Science 124, 154 (27 July1956)]. TheExpand
Determinationi of the Curie point for a sample of the mineralized denticles of C. stelleri by J. C. Belshe shows also that the material is magnetite and not maghemite
  • Treatise otn Invertebrate Paleonitology
  • 1960
The Crystal chemistry of dahllite
Lowenstam collected the chitons from Vifia del Mar, Chile, and J. Westphal aided in the collection of the chiton samples from Palau
    National Museum supplied the reference sample of lepidocrocite (cat. No. R9593) from Horhausen, Germany. The dahllite standard, stipplied by D. McConnell
      We thank Professor Robert Bock for his References and Notes