Apatite is a group of phosphate minerals with high concentrations of OH −, F −, Cl − or ions, respectively, in the crystal. It hardness defines 5 on the Mohs scale.

Small grains of magnetite occur in almost all igneous and metamorphic rocks. It is the most magnetic natural occuring minerals in the World. Magnetite is rock mineral and one of the most important iron ore minerals with chemical formula is iron(II,III) oxide, Fe2+Fe3+2O4 .It also as the name magnetic minerals to attracted to a magnet. Apatite Treatments; Some violet apatite turns green on exposure to radium (Przibram and Caffyn, 1956) and violet apatite which has lost its color from heating (perhaps to 500°C) is turned partly green and partly violet; there is no effect of electrons and only a minor effect of X-rays on some yellow and green specimens (Pough and Rogers, 1947; Pough, 1957) – Nassau (1984) Department of Earth Sciences, University of Cambridge webmaster@esc.cam.ac.uk Nepheline Specific Gravity is a measurement that determines the density of minerals. Calculated Properties of Apatite-(SrOH) Electron Density: Bulk Density (Electron Density)=3.53 gm/cc note: Specific Gravity of Apatite-(SrOH) =3.74 gm/cc. Optical Data: Uniaxial (-), e=1.637, w=1.651, bire=0.0140. Fermion Index: Fermion Index = 0.02 Boson Index = 0.98 : Photoelectric: PE Apatite-(SrOH) = 45.07 barns/electron Browse the 1A collection: Please note, scale bars are 1cm in hand specimen photographs and 1mm in thin section.

"Apatite" is a field term for unidentified calcium phosphate members of the apatite group. Apatite is characteristic of biological systems.

Optical Properties of Nepheline gives us information about mineral properties like photoelectricity, radioactivity, luminescence and also about the Atomic Structure of Nepheline.

It is one of a few minerals produced and used by biological micro-environmental systems. The first apatite-type NLO sulfate K 4 Sb(SO 4) 3 Cl has been successfully synthesized.. Mineral-inspired cosubstitution was realized when choosing Ca 5 (PO 4) 3 F as the prototype..

Most "apatite" is fluorapatite, whereas hydroxylapatite is much less common and chlorapatite is very rare. Apatite Optical Properties Transparency Transparent - Translucent Dispersion Strength: Weak Fire Value: 0.013 Refractive Index 1.634-1.638 Tolerance:(+0.012/-0.006) Birefringence 0.002-0.008 Optic Character Uniaxial Optic Sign Negative

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