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Serpentina verde di Genova, from Genoa, Liguria, Italyīrecciated serpentinite. Serpentina di Corsica, from Corsica, Franceīreccia of angular clasts of brown and pale green serpentinite in a paler coloured matrix with a reticulated system of very fine grey fibrous chrysotile veins throughout. Rounded clasts of granular silicified serpentine in massive quartz matrix, with streaks of cream quartz-dolomite. Note brown crystals of ?siderite filling cavities on underside of specimen.īrecciated meta-calcilutite, with brown limonitic veining, occasionally widening into calcite-limonite-opaque oxide aggregates. Some of the brown may be limonitic but most is filler/polishing compound.īrecciated meta-calcilutite with a few spherical two-phase calcite-filled cavities, and with limonitised siliceous veining. It retains signs of soft sediment deformation in darker clasts. The cream end of the specimen is a strongly deformed coarse clastic rock with rounded clasts up to 20mm, some containing brown oxide zones, that plastically intrude the other part.īrecciated meta-calcilutite with veins of colourless calcite containing metallic yellow pyrite. The cream tint and red fracture-fill is caused by jeweller's rouge used for polishing, and is not evident on the unpolished side of the specimen. It is poorly sorted and structureless, and may be an ignimbrite.Ī deformed, veined carbonate-rich rock. This slightly altered polygenetic volcaniclastic rock has clasts/tephra which include alkali volcanic types, sediments and possible skarn fragments. Poorly sorted, with clasts up to 50mm, having rounded, carbonate-infilled vesicles. The fine-grained zone has a medium-grained leucocratic carbonate-rich core.Īltered pumice breccia. The large rounded clasts are ferromagnesian-rich volcanic rock, one having a higher feldspar content. Much of the brown is filler.Īltered volcanic breccia with a central pale grey fine-grained zone. A low-density breccia with angular clasts of meta-carbonate, and hematite-filled veins. There is a faint preferred orientation of the clasts. A poorly sorted breccia with clasts of rusty-coloured medium grained crystalline rock, discrete crystals of altered feldspar, and ferromagnesian minerals, all in a very fine-grained hematite-bearing groundmass. Coarse breccia with clasts of red vesicular rock in pale carbonate matrix. Etna, Catania, Sicily, ItalyĪn altered pumice flow breccia.
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