Spinel

Spinel is an interesting mineral both for its physical properties and its beauty.

🧪 General characteristics

  • Chemical formula : MgAl₂O₄ (magnesium aluminum oxide)

  • Crystal system : Cubic

  • Hardness (Mohs scale) : 7.5 to 8 (relatively hard, close to sapphire)

  • Colors : Very varied – red, pink, blue, purple, orange, colorless, etc.

🔬 Origin and training

Spinel is formed mainly in:

  • Magnesium-rich metamorphic rocks , such as dolomitic marbles

  • Igneous rocks such as basalt and peridotite

  • Alluvial deposits , where it can be found in gem form

💎 Spinel gemstone

Spinel is a gemstone in its own right. It is often confused with:

  • Ruby (the "red spinel" was long mistaken for ruby)

  • Sapphire , especially in its blue varieties

⚠️ Famous example: the "Black Prince's Ruby" on the British crown is actually a red spinel .

🎨 Variety of colors

The colors depend on the trace elements present:

  • Bright red : presence of chromium

  • Blue/purple : presence of iron or cobalt

  • Pink/orange : complex mixture of chromium and iron

  • Colorless : very rare

🌍 Famous deposits

  • Burma (Myanmar) : the most beautiful red spinels

  • Sri Lanka

  • Tajikistan

  • Tanzania

  • Vietnam

🧭 Uses and symbolism

  • Jewelry : used in rings, necklaces, earrings

  • Symbolic : often associated with energy, revitalization, psychic protection

🔍 Not to be confused with…

  • Synthetic spinel , often used in watches or as an imitation of natural gems

  • Other minerals of similar appearance but different composition

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List of Stones & Minerals

Spinel refers to both a mineral and a group of minerals that are metal oxides and share the crystal structure. They usually form hard, glassy octahedrons and implanted twins. It is found in mafic igneous rocks, in aluminum-rich metamorphic rocks, and in limestone with contact metamorphism.

Depending on the composition and the impurities it contains, there are different varieties and colors of spinel. Red spinel is generally the most appreciated, also called noble spinel or ruby ​​spinel, its color is due to the presence of chromium and aluminum. Bluish spinel contains iron, zinc and cobalt. Black and greenish spinel contains iron and zinc.

The name spinel comes from the Latin "spinel" meaning "little spine", referring to the sharp peaks of the crystals.

Main deposits: Canada, India, Sri Lanka and Myanmar.

The benefits: Spinel is a stone associated with vitality. It is said to enhance positive aspects of personality. It facilitates the opening of the chakras and the ascension of kundalini energy.