Silicon Carbide Crystal Natural Carborundum Mineral Specimen Iridescent Crystal Display Piece 60-90mm

Long Description:

Natural Silicon Carbide Crystal – Carborundum Mineral Specimen

This Silicon Carbide crystal, commonly known as Carborundum, is a striking
mineral specimen displaying vibrant iridescent colours and a distinctive crystalline structure. Measuring approximately 60–90mm, each piece is carefully selected for its visual impact and structural quality. The photo provided shows an example of the specimen you will receive, with each piece exhibiting natural variation in form, colour, and surface texture.

Material Type & Composition

Silicon Carbide (SiC) is a compound composed of silicon and carbon atoms arranged in a tightly bonded crystalline lattice. It crystallises in hexagonal or rhombohedral crystal systems, depending on its formation conditions. While naturally occurring Silicon Carbide (known as moissanite) is extremely rare, most specimens available in this form are produced through high-temperature industrial processes, resulting in well-developed crystalline structures suitable for collection and display.

Formation & Crystal Structure

Silicon Carbide forms under extremely high temperatures, typically in environments exceeding 2,000°C. In industrial settings, it is created by heating silica and carbon in electric furnaces, allowing crystals to grow in layered or plate-like formations. These growth conditions result in sharp-edged crystal forms with a complex internal structure and high hardness, ranking around 9–9.5 on the Mohs scale, making it one of the hardest known materials after diamond.

Appearance, Colour & Optical Effects

This specimen is known for its vivid iridescent surface, displaying a spectrum of colours including blues, greens, purples, golds, and metallic tones. The rainbow effect is caused by light interference on the crystal surface, often enhanced by thin oxide layers formed during cooling. The reflective, metallic lustre combined with angular crystal faces creates a visually dynamic specimen that changes appearance depending on lighting and viewing angle.

Surface Features & Texture

Silicon Carbide crystals typically exhibit sharp, angular formations with a layered or clustered structure. The surface may include natural ridges, plate-like growths, and geometric patterns formed during crystallisation. These features contribute to the specimen’s unique appearance and tactile quality, making each piece distinct.

Collecting, Display & Decorative Use

Carborundum specimens are highly valued for their bold colouration and industrial origin, offering a contrast to traditional natural minerals. This piece is ideal for display in mineral collections, on shelves, or as a standalone decorative feature. Its iridescent surface makes it particularly eye-catching under natural or artificial light, enhancing its appeal as a display specimen.

Scientific & Educational Interest

Silicon Carbide is widely used in industrial applications due to its hardness, thermal conductivity, and resistance to wear. It plays an important role in abrasives, semiconductors, and high-performance materials. As a specimen, it represents the intersection of mineralogy and material science, making it of interest to both collectors and those interested in advanced materials.

Authenticity & Guarantee

This crystal is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. Each piece is carefully chosen to ensure quality, authenticity, and presentation.

Additional Information

• Material: Silicon Carbide (Carborundum, SiC)
• Crystal System: Hexagonal / Rhombohedral
• Size: Approximately 60–90mm
• Finish: Natural crystalline formation
• Specimen: Example shown in photo, each piece is unique
• Iridescent colour variations are natural to this material

This Silicon Carbide crystal offers a unique combination of striking visual effects and advanced material properties, making it a standout specimen for collectors, display, or educational interest