Aggregate of Datolite crystals, one of them clearly dominant, with facet-like faces and very sharp edges, intense translucent luster and a soft coloration with small remnants of Quartz on the base. The left side of the specimen displays a serrated habit probably representing marks left by high temperature Calcite that has disappeared.
Of high quality for the deposit, it comes from an ophite quarry in Errigoiti, Basque Country, in which pillow lavas are exploited for aggregates.
The specimen belonged to Santiago Jiménez who, especially in the 1980s and 90s, assembled an excellent collection with a very good representation of the mineralogy of Northern Spain.
Ofitas de Rigoitia Quarry, Memorikas, Errigoiti, Comarca Busturialdea-Urdaibai, Vizcaya / Bizkaia, Basque Country (Euskadi) Spain
Specimen size: 5.6 × 4.2 × 4.2 cm = 2.20” × 1.65” × 1.65”
Main crystal size: 4 × 3.6 cm = 1.57” × 1.42”
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