Description
About This Black Tourmaline in Quartz Feldspar Pegmatite
This Black Tourmaline in Quartz Feldspar Pegmatite is a genuine natural crystal and mineral specimen, measuring approximately 81mm. It is a carefully chosen piece with the photograph showing the actual specimen you will receive. Full sizing details can be seen in the photo, allowing buyers to view the form, proportions, colour, and natural surface features of this individual specimen.
This attractive mineral specimen combines three important pegmatite minerals: black tourmaline, quartz, and feldspar. The contrast between the dark tourmaline and the lighter quartz and feldspar matrix gives the piece strong visual appeal, making it suitable for mineral collectors, crystal displays, natural history collections, cabinet specimens, educational geology sets, and decorative display.
Mineral Type and Crystal Species
Black Tourmaline is most commonly associated with the tourmaline species Schorl, a sodium iron aluminium borosilicate mineral. Schorl is the most widespread black tourmaline species and is recognised for its deep black colour, strong lustre, and distinctive crystal habit. It often forms elongated prismatic crystals with lengthwise striations, meaning the crystal faces may show fine natural lines running parallel to the crystal growth direction.
Quartz is silicon dioxide, with the chemical formula SiO2, and is one of the most abundant minerals in the Earth’s crust. It may appear white, cloudy, translucent, glassy, greyish, or milky depending on inclusions and growth conditions. Feldspar refers to a major group of rock-forming aluminosilicate minerals, commonly occurring in pegmatites as pale cream, white, pinkish, beige, or grey mineral masses. Together, these minerals form a classic pegmatite association.
Geology and Pegmatite Formation
Pegmatite is a very coarse-grained igneous rock that forms during the final stages of magma crystallisation. As a magma body cools, remaining fluids can become enriched in silica, aluminium, boron, sodium, potassium, lithium, and other elements. These late-stage fluids may crystallise slowly in pockets, veins, and dykes, allowing unusually large and well-developed mineral crystals to grow.
Black tourmaline is strongly associated with boron-rich pegmatite environments. In these settings, tourmaline can develop alongside quartz and feldspar as the mineral-rich fluids cool and crystallise. The result is a natural intergrowth of contrasting minerals, with black tourmaline crystals embedded in or emerging from a lighter quartz-feldspar matrix.
Appearance, Colour, and Natural Features
This specimen displays the classic visual contrast expected from Black Tourmaline in Quartz Feldspar Pegmatite. The tourmaline is typically dark black to very deep charcoal, while the surrounding quartz and feldspar may show pale, creamy, white, off-white, grey, or slightly translucent areas. The matrix gives the specimen a rugged natural structure and helps show the geological environment in which the tourmaline formed.
Natural features may include rough crystalline surfaces, feldspar cleavage faces, quartz-rich areas, contact marks, small chips, surface texture, mineral boundaries, and natural colour variation. These are normal characteristics of genuine mineral specimens and are part of the geological character of the piece.
Collectable and Decorative Use
Black Tourmaline in Quartz Feldspar Pegmatite is a popular mineral combination for collectors because it clearly displays a natural pegmatite association rather than a single isolated crystal. It is especially appealing for those interested in igneous geology, crystal habits, mineral intergrowths, and natural matrix specimens.
The 81mm size makes this piece suitable for display in a cabinet, on a shelf, desk, windowsill, study area, or natural history collection. Its strong black-and-light colour contrast allows it to stand out when displayed alongside quartz clusters, feldspar specimens, mica minerals, garnets, beryl, ammonites, fossils, or other geological display pieces.
Authenticity and Certificate
This Black Tourmaline in Quartz Feldspar Pegmatite is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. The crystal has been carefully selected for its natural mineral interest, attractive appearance, and collectable display quality. As the photograph shows the actual specimen supplied, buyers can purchase with confidence knowing they will receive the individual crystal shown.
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