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  • A prominent milky white quartz crystal with mixed prismatic and tabular terminations, emerging from a deep blue dumortierite-rich matrix. Smaller quartz crystals line the left side, creating a balanced composition between the lustrous white crystals and the deep blue background matrix from Brazil's Vaca Morta Quarry.
  • A prominent milky white quartz crystal with mixed prismatic and tabular terminations, emerging from a deep blue dumortierite-rich matrix. Smaller quartz crystals line the left side, creating a balanced composition between the lustrous white crystals and the deep blue background matrix from Brazil's Vaca Morta Quarry.
  • A prominent milky white quartz crystal with mixed prismatic and tabular terminations, emerging from a deep blue dumortierite-rich matrix. Smaller quartz crystals line the left side, creating a balanced composition between the lustrous white crystals and the deep blue background matrix from Brazil's Vaca Morta Quarry.
  • A prominent milky white quartz crystal with mixed prismatic and tabular terminations, emerging from a deep blue dumortierite-rich matrix. Smaller quartz crystals line the left side, creating a balanced composition between the lustrous white crystals and the deep blue background matrix from Brazil's Vaca Morta Quarry.
  • A prominent milky white quartz crystal with mixed prismatic and tabular terminations, emerging from a deep blue dumortierite-rich matrix. Smaller quartz crystals line the left side, creating a balanced composition between the lustrous white crystals and the deep blue background matrix from Brazil's Vaca Morta Quarry.
  • A prominent milky white quartz crystal with mixed prismatic and tabular terminations, emerging from a deep blue dumortierite-rich matrix. Smaller quartz crystals line the left side, creating a balanced composition between the lustrous white crystals and the deep blue background matrix from Brazil's Vaca Morta Quarry.
  • A prominent milky white quartz crystal with mixed prismatic and tabular terminations, emerging from a deep blue dumortierite-rich matrix. Smaller quartz crystals line the left side, creating a balanced composition between the lustrous white crystals and the deep blue background matrix from Brazil's Vaca Morta Quarry.
  • A prominent milky white quartz crystal with mixed prismatic and tabular terminations, emerging from a deep blue dumortierite-rich matrix. Smaller quartz crystals line the left side, creating a balanced composition between the lustrous white crystals and the deep blue background matrix from Brazil's Vaca Morta Quarry.

DUMORTIERITE IN QUARTZ

Vaca Morta Quarry, Serra da Vereda, Boquira, Bahia, Brazil
12.8 x 8 x 4.3 cm
$700.00
$700.00
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ABOUT THE SPECIMEN

Distinctive specimen from Brazil's Vaca Morta Quarry, where milky white quartz crystals are elegantly backdropped by rich blue dumortierite inclusions. The commanding central crystal displays an uncommon combination of prismatic and tabular terminations, complemented by a series of smaller prismatic points along its left margin. This balanced arrangement exemplifies the unique crystallization sequence found at this celebrated Bahia locality. The specimen's  scale, compelling crystal morphology, and aesthetic interaction between host and inclusion minerals position it as a great example of this classic Brazilian material.

 

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Operated primarily to extract blue quartzite as an industrial raw material, the Vaca Morta quarry sits within the São Francisco Craton in western Bahia, where Proterozoic metasedimentary sequences underwent pervasive boron metasomatism - the process responsible for concentrating the aluminum borosilicate dumortierite throughout the host quartzite. The blue color is an intrinsic structural feature of the species tied to iron substitution and charge-transfer interactions rather than a trace impurity, which accounts for its intensity and consistency. First recognized as a collector locality around 2013, Vaca Morta rapidly established itself as the definitive world source for euhedral quartz crystals containing acicular dumortierite inclusions - a combination that exists elsewhere only as a rarity. Habit ranges from tightly packed fibrous blue stripes running parallel to the quartz c-axis to radiating sprays trapped within water-clear terminated prisms, the latter being the most sought-after form.