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Tourmaline is a group of complex boron silicate minerals known for its wide variety of colors, from black, brown, and green to vibrant pinks, blues, and reds. It is a popular gemstone for jewelry and collector's specimens due to its diverse hues, often exhibiting color zoning and pleochroism (different colors when viewed from different angles).

Characteristics

Composition: A group of minerals that share a common crystal structure but vary chemically, often containing elements like silicon, aluminum, boron, sodium, lithium, and iron.

Color: Occurs in almost every color, including black, brown, red, pink, blue, yellow, green, and can even be colorless.

Special properties:

Color zoning: Many tourmalines have different colors within the same crystal or cross-section, such as the popular "watermelon" variety which has a red center and green outer ring.

Pleochroism: A single stone can display different colors or color intensities depending on the viewing angle.

Crystal structure: Has a trigonal crystal system and is often found in elongated crystals.

Luster: Vitreous (glass-like).

Transparency: Ranges from translucent to opaque.

Uses and value

Gemstone: A favorite for jewelry due to its variety of colors and affordability.

Collector's item: Valued by mineral collectors, especially for specimens with attractive colors and well-formed crystals.

Birthstone: It is one of the birthstones for the month of October.