ARTINITE, COMTÉ DE SAN BENITO, BENITOITE GEM MT DIABLO, CA, USA (miniature)
L'artinite est un carbonate de magnésium basique hydraté, de formule Mg₂(CO₃)(OH)₂·3H₂O. Ce minéral se présente généralement sous forme de cristaux prismatiques monocliniques blancs et soyeux, qui peuvent apparaître en amas radiaux ou en incrustations. Avec une dureté Mohs de 2,5 et une densité de 2, l'artinite est relativement tendre et légère. On la trouve principalement dans les veines hydrothermales de basse température et au sein de roches ultramafiques serpentinisées, souvent associée à des minéraux tels que la brucite, l'hydromagnésite, la pyroaurite, le chrysotile, l'aragonite, la calcite, la dolomite et la magnésite. Identifiée pour la première fois en 1902 en Lombardie (Italie), elle a été nommée en l'honneur du minéralogiste italien Ettore Artini (1866-1928).
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