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        "sample_id":"76-3A",
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        "sample_type":"outcrop specimen",
        "sampling_method":"outcrop sampling",
        "material_class":"rock",
        "stratigraphic_unit":"Cooma Granodiorite",
        "geological_province":"Lachlan Orogen",
        "sample_remark":"Williams 2001 paraphrased: \"Sample 76-3A was collected from a large fresh boulder excavated from a deep road cut on the flank of Nanny Goat Hill in Cooma township. The granodiorite is medium grained & massive & contains a high abundance of enclaves on all scales from small clots of minerals to rock fragments up to 0.5 m diameter. The enclaves all of sedimentary derivation can be matched closely with many of the highest grade rocks in the regional aureole including metapsammite biotite schist & b&ed gneiss. The granodiorite is exceedingly quartz rich (~50%) & unequilibrated mineralogically. Aluminous phases include biotite muscovite ragged sieved & alusite up to 2 mm cordierite phenocrysts up to 15 mm (most now pinitised) & mats of fibrolitic sillimanite. K-feldspar crystals up to 4 mm commonly have myrmekite developed at their margins & plagioclase more abundant than in the migmatites commonly occurs as zoned tabular grains with calcic cores. Biotite is crowded with pleochroic haloes around inclusions of zircon & monazite. Zircon is very abundant in the Cooma Granodiorite mostly sharply euhedral & with a very similar grainsize range to zircon in the low-grade semipelites (30-250 um). It is however a complex population. Although euhedral grains dominate a few crystals are strongly rounded & the frosted surface characteristic of detrital zircon is clearly visible under an optical microscope. Aspect ratios range from 1 to ~5. Terminations with strongly developed faces predominate particularly on the larger & more equant crystals but very simple prismatic crystals with only prisms & pyramids are common among the finer grains. Cathodoluminescence images reveal the reason for this variety. Virtually all zircons contain a core & it was principally the size & shape of that core that determined the size & shape of the final crystal. At one end of the spectrum are crystals in which the core is very large (>100 um) & strongly rounded.",
        "earth_materials":"Y",
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        "organic_geochemistry":null,
        "geochronology":null,
        "isotope_groups":null,
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        "rock_properties":null,
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        "sample_originator":"Williams, S.",
        "date_acquired":"3000-01-01T00:00:00"
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