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        "stratigraphic_unit":"dolerite dyke, Smithton quarry",
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        "sample_remark":"Everard et al. 2023. MRT Report TR36: (This dolerite dyke) consists of scattered, partly altered olivine phenocrysts in a dominantly subophitic groundmass of titaniferous augite, plagioclase, titanomagnetite and partly altered mesostasis, with amygdales of carbonate and/or smectite.The olivine phenocrysts are generally +/- equant, <= 1.5 mm across, and partly (approx. 20%) to completely altered to a fibrous, pleochroic (pale to medium yellow-brown), strongly birefringent, length-slow alteration product, probably an amphibole and possibly anthophyllite. The bulk of the rock consists of a subophitic groundmass of pink-mauve titaniferous augite prisms (typically 500 micron-1mm ling [sic long] and 100-200 micon wide) and plagioclase laths (up to 600 x 100 um). Equant angular opaque grains, mostly 20-50 micron across are fairly abundant and are probably titanomagnetite/ulvospinel. There is some interstitial, strongly zoned but apparently untwinned feldspar (possibly alkali feldspar) and pale yellow-brown alteration (probably smectite). Numerous, round (mostly 0.5-1.5 mm diameter) to slightly flattened or irregular amygdales are filled with sparry carbonate and/or fine-grained pale brown smectite. In those amygdales in which both minerals are present, smectite forms the lining and carbonate the core.",
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        "sample_originator":"Duncan, D.M.",
        "date_acquired":"3000-01-01T00:00:00"
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