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In trachite vulcanica,cristal 17 mm,ben formato,opaco,bianco-grigiastro.

In a projetto silicified,of big cristals leucite colorless, fractured, mono cristal rhombododecahedral,11 mm, brown.

In geode of projetto dolomitic calcareous, cristals partially rounded, maybe a little 'recast, 15 mm, white glazed transparent.

In a volcanic tuff, disseminated drowned cristals,shaped icositetraedro,grayish white,opal,from 15 to 20 mm diameter.

On a projetto dolomitic gray, in druse ecristaltended cristals rhombododecahedral, rounded and corroded, 1 cm, glazed white-grayish, lightly coated in areas of micro pyrocristalene blacks.

On a projetto dolomitic gray, in druse ecristaltended cristals white, glassy, rombododecahedrical, 10 mm, slightly rounded, partially covered by micro cristals blacks pyrocristalene.