Large A-Grade Clear Quartz Crystal from Brazil – Genuine Natural Rock Crystal Mineral with Certificate of Authenticity

Description

This stunning Large Rock Crystal Quartz specimen from Brazil represents one of the finest examples of natural high-grade quartz available to collectors today. Measuring approximately 50–80mm, each crystal is a carefully hand-selected specimen chosen for its superior clarity, structure, and aesthetic form. Rock Crystal, the purest variety of quartz, is celebrated for its water-clear transparency, mirror-like luster, and sharply defined crystal habit.

The specimen shown in the photographs is the exact crystal you will receive, ensuring authenticity and uniqueness. A Certificate of Authenticity accompanies every specimen, verifying that it is a genuine natural mineral. The scale cube equals 1 cm, providing an accurate visual reference for size comparison.

Geological Formation and Origin

This exceptional Rock Crystal originates from Minas Gerais, Brazil, one of the most prolific mineral regions on Earth. The area’s vast hydrothermal systems are globally renowned for producing some of the clearest and most geometrically perfect quartz crystals ever discovered. These crystals formed millions of years ago deep within hydrothermal veins inside granitic host rocks, where silica-rich fluids slowly cooled and crystallised under stable temperature and pressure conditions.

Quartz (SiO₂) is a tectosilicate mineral within the silicate class and crystallises in the trigonal crystal system. The natural growth environment in Minas Gerais allowed the quartz to form into large, sharply terminated hexagonal prisms with pristine transparency. Over geological time, minute variations in temperature and chemistry led to the internal clarity and flawless termination surfaces that make Brazilian quartz world-famous.

Mineralogical and Morphological Features

This specimen displays the typical hexagonal prism capped by a six-sided pyramidal termination, a defining characteristic of quartz crystals. Subtle horizontal striations are visible along the prism faces — a natural growth pattern that confirms its authenticity and lack of artificial polishing. The crystal’s optical clarity allows internal light reflection and refraction, giving it a brilliant internal glow under natural illumination.

Quartz is both piezoelectric and pyroelectric, meaning it can generate an electrical charge under mechanical stress or temperature change. These scientific properties have made it indispensable in modern electronics, including watches, resonators, and optical instruments. Collectors, however, prize it not only for its physical perfection but also for its representation of pure geological balance — the intersection of chemistry, pressure, and time in crystalline form.

Geological and Scientific Significance

From a geological standpoint, this specimen represents a classic example of macrocrystalline quartz formation. The hydrothermal conditions under which it developed mirror those responsible for producing many of Earth’s greatest mineral treasures. Rock Crystal is part of the Quartz Group, within the tectosilicate framework, where each silicon atom is bonded to four oxygen atoms forming a continuous three-dimensional lattice — the key to its strength and durability.

The deposit environment in Minas Gerais is notable for its pegmatitic and hydrothermal vein systems, often associated with feldspar and mica minerals. These environments, rich in silica and volatiles, created ideal conditions for the slow, undisturbed growth of large transparent crystals such as this one.

Authenticity and Display

Every specimen we offer is 100% genuine, sourced responsibly, and accompanied by a Certificate of Authenticity. The photographs show the actual crystal you will receive, not a stock image. The scale cube equals 1 cm, and the crystal’s 50–80mm size range makes it perfect for both collectors and display enthusiasts.

This Large Rock Crystal Quartz from Brazil is more than a mineral — it is a geological masterpiece, capturing the natural beauty and precision of crystalline growth over millions of years. It represents both scientific wonder and aesthetic elegance, a timeless piece of the Earth’s history.