| http://www.w3.org/ns/prov#value | - also a white Trachytic rock with brown specks; But these hills are mainly formed of white, from tufa, with occass. crystals of glassy felspar. & few smaller fragments of scoriae ??? it is in places laminated; is traversed by sort of plates, frequently assuming a sphaerical form (containing inside the softer matter), which plates is compact hard & resembles a Lava; external appearance of these plat
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