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Walter R. Kellogg


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Mineral Specimen #6940    Dumortierite on and Included in Double Terminated Quartz

Vaca Morta (Dead Cow) Quarry, Bahia, Brazil

7.5 x 2.8 x 2.6 cm
3 x 1.1 x 1 in


The Dumortierite of this specimen is a light blue, cyan color. It is present on the surface of two faces of the Quartz crystals as parallel lines perpendicular to the length of the crystal. The crystal is double terminated with a single, simple termination at one end whereas the other end is composed of complex multiple terminations. Just below the surface of these terminations is more Dumortierite which in places forms phantoms just below the surface. Under UV SW, the Dumortierite glows a color similar to Scheelite. Please note: the UV photo had to be edited extensively to get a decent approximation of this color, but the color is more similar to Scheelite than depicted.

Condition: Good

Flaws: Below the surface of the crystal face opposite the thinner face with the lines of Dumortierite, there is a large internal fracture. On this same face, there is a small chipped area missing. None of this is visible when the specimen is viewed with the Dumortierite showing.

This mineral is also found in the following galleries: Minerals From Brazil | Nesosilicates | Quartz | Fluorescents | Minerals with Inclusions | Minerals Priced Between 100 and 199 Dollars