Mineralpedia Details for Sanromanite

Named for Francisco J. San Roman, a Chilean naturalist who specialized in mineralogy and geology. It occurs only at its type locality in the Santa Rosa Mine in the Tarapaca Region of Chile where is appears as colorless, lath-like fine needles to greenish-yellow radiating, acicular aggregates or artichoke like aggregates. It is associated with malachite, calcite, anhydrite, chalconatronite, sodium-hydrogen carbonates and juangodoyite.

Ref. Schluter, et al. and Neues Jahrbuch für Mineralogie - Abhandlungen, Volume 183, Number 2, February 2007 , pp. 117-121(5)

Formula

Na₂CaPb₃(CO₃)₅ 

Crystal System

Hexagonal 

Class

Hexagonal - Dihexagonal Pyramidal 

Hardness

- 

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Honey yellow pirismatic crystals to 1mm with good coverage on and in pastel blue Juangodoyite.

Free-standing, honey yellow, acicular crystals of Sanromanite. Usually the crystals are flat lying on matrix.

Yellow prismatic crystals to 1mm with good coverage associated with green Chalconatronite.