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Kornerupine is a rare borosilicate mineral, often found as brown, green, or yellow, transparent to opaque crystals. It is known for its pleochroism, meaning it can display different colors when viewed from different angles, and can sometimes exhibit chatoyancy (cat's eye effect) or asterism (star effect) when cut as a cabochon.

Here's a more detailed description:

Appearance:

Color:

Kornerupine can be found in a variety of colors including brown, green, yellow, and even blue.

Crystal System:

It crystallizes in the orthorhombic system, often forming slender, tourmaline-like prisms or massive, fibrous forms.

Clarity:

Gem-quality kornerupine is often transparent, but it can also be found in opaque forms.

Inclusions:

It may contain inclusions such as needle-like inclusions, which can cause the chatoyancy or cat's eye effect.

Properties:

Pleochroism:

This is a key characteristic, meaning the gem can appear to have different colors when viewed from different angles.

Hardness:

Kornerupine is known for its good hardness, making it suitable for jewelry.

Rarity:

It is a relatively rare gemstone, making it highly sought after by collectors.

Other notable points:

Named after: It's named after the Danish geologist Andreas Nikolaus Kornerup.

Cut: Kornerupine is often faceted or cut en cabochon to enhance its color and chatoyancy.

Metaphysical properties: Some believe it can help with emotional healing, stress relief, and promoting inner peace