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Spinel is a gem and mineral, typically known for its vibrant colors and hardness of 8 on the Mohs scale. It's a member of a group of rock-forming minerals that are metal oxides with the general composition ABO, where A can be magnesium, iron, zinc, manganese, or nickel, and B can be aluminum, chromium, or iron. Spinel's most common color is red, but it can also be found in shades of blue, green, brown, black, pink, and even colorless.

Here's a more detailed description:

Composition and Structure:

Spinel has a chemical formula of MgAl2O4, meaning it's composed of magnesium, aluminum, and oxygen.

It belongs to the cubic crystal system and typically forms octahedron-shaped crystals (two back-to-back pyramids).

The spinel group is divided into three series based on the element in the "B" position: aluminum-spinel, chromium-spinel (chromite), and iron-spinel (magnetite).

Color:

Spinel's color is primarily due to trace elements like chromium, iron, and cobalt.

Intense reds and pinks are often caused by chromium, while mixtures of iron and chromium can result in orange and purple stones.

Violet to blue spinel is colored by iron, and vibrant blues can be due to cobalt.

Some spinels can also appear greenish, brown, black, or even colorless.

Physical Properties:

Hardness: 8 on the Mohs scale (durable for jewelry).

Specific Gravity: 3.60.

Refractive Index: 1.718.

Transparency: Generally transparent to translucent.

Cleavage: No true cleavage (making it less likely to fracture easily).

Crystal System: Cubic.

Occurrence and Uses:

Spinel is found in various geological settings, including gravel deposits, metamorphic rocks, and some igneous rocks.

It's a popular gemstone, often used in jewelry due to its hardness and vibrant colors.

Some notable spinel locations include Sri Lanka, Afghanistan, Tajikistan, Vietnam, Tanzania, and Kenya.

Historically, red spinels were often mistaken for rubies due to their similar color.

The fine, intense red spinels from Mogok, Myanmar are known as "anyant pan" and are highly prized.