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75 underground 6 step online dating guide rare pdf

Most natural diamonds have ages between 1 billion and 3.5 billion years.

At room temperature and pressure it is metastable and graphite is the stable form, but diamond almost never converts to graphite.Fresh rock is dark bluish green to greenish gray, but after exposure rapidly turns brown and crumbles.It is hybrid rock with a chaotic mixture of small minerals and rock fragments (clasts) up to the size of watermelons.Under high pressure and temperature, carbon-containing fluids dissolved minerals and replaced them with diamonds.Much more recently (tens to hundreds of million years ago), they were carried to the surface in volcanic eruptions and deposited in igneous rocks known as kimberlites and lamproites.They are a mixture of xenocrysts and xenoliths (minerals and rocks carried up from the lower crust and mantle), pieces of surface rock, altered minerals such as serpentine, and new minerals that crystallized during the eruption. The composition forms a continuum with carbonatites, but the latter have too much oxygen for carbon to exist in a pure form.Instead, it is locked up in the mineral calcite (Ca CO All three of the diamond-bearing rocks (kimberlite, lamproite and lamprophyre) lack certain minerals (melilite and kalsilite) that are incompatible with diamond formation.Several non-diamond materials, which include cubic zirconia and silicon carbide and are often called diamond simulants, resemble diamond in appearance and many properties.Special gemological techniques have been developed to distinguish natural diamonds, synthetic diamonds, and diamond simulants.Small amounts of defects or impurities (about one per million of lattice atoms) color diamond blue (boron), yellow (nitrogen), brown (lattice defects), green (radiation exposure), purple, pink, orange or red.Diamond also has relatively high optical dispersion (ability to disperse light of different colors).


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