Calcite gemmy crystal from this classic North American locality, very transparent, bright and with a delicate yellow color. It is disposed very aerially on a matrix with galena, sphalerite, dolomite and pyrite. It is also crystallographically very interesting because of the shapes of the elongated rhombohedron, with the faces of the scalenohedron. Acquired by J. Astor from J. Montal in the mid-1970s, with labels.

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A very nice specimen from a classic American locality. A group of interpenetrated calcite crystals showing curvatures on their faces and edges. They are transparent to translucent and have a delicate yellow color with zonation. With small rhombohedral crystals of dolomite, peppered by microcrystals of chalcopyrite.

A very nice specimen from a classic American locality. A group of doubly terminated crystals showing parallel growth and curvatures on their faces and edges. They are translucent and have a delicate yellow color. With small rhombohedral crystals of dolomite, peppered by microcrystals of chalcopyrite.