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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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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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The Vaca Morta quarry in Minas Gerais, Brazil, demonstrates significant dumortierite-quartz mineralization occurring within metamorphosed pegmatitic bodies. The assemblage consists of dumortierite forming fibrous to columnar crystals in association with massive to crystalline quartz (SiO2), indicating high-temperature metamorphic conditions during formation. The mineralization process involved boron-rich fluids interacting with aluminosilicate precursor materials under conditions of regional metamorphism. This locality exhibits distinctive blue to violet dumortierite crystals penetrating clear to smoky quartz, producing specimens that beautifully demonstrate borosilicate mineral formation in metamorphic environments.