AllMineralsRock
Spinel
Spinel is a very popular gemstone composed of magnesium aluminum oxide. [1]
Spinel: Quick Facts and Characteristics
Some quick facts for Spinel:- Transparency: Spinel can be opaque, translucent or transparent.
- Luster: In terms of luster, spinel is vitreous (glassy).
- Streak: Spinel streaks white.
- Hardness: Spinel's hardness ranges from 7.5 to 8 on the Moh's scale.
- Specific Gravity: Spinel's specific gravity ranges from 3.58 to 3.58.
Spinel: Background and Summary
Spinel is a mineral that is commonly found in a variety of geological environments. It is a magnesium aluminum oxide mineral that can be found in a range of colors, including red, blue, green, yellow, and purple. It is often used as a gemstone due to its vibrant colors and durability, which makes it an excellent choice for jewelry.One of the most distinctive features of spinel is its crystal structure, which is cubic. This means that it has a regular, repeating pattern of atoms that make up its structure. It is also relatively hard, with a hardness rating of 8 on the Mohs scale, which makes it resistant to scratches and damage.
To identify spinel, there are several key characteristics to look for. One of the most important is its color, which can range from bright red to deep blue. Another important feature is its crystal structure, which is cubic and often forms octahedral or dodecahedral crystals. Additionally, spinel often has a high luster and a transparent to translucent appearance.
Spinel has a range of uses, both as a gemstone and in industrial applications. As a gemstone, it is often used in jewelry, including rings, necklaces, and earrings. It is also used in watchmaking, as it is durable and scratch-resistant. In industrial applications, spinel is used as a refractory material, as well as in the production of ceramics and glass.
Spinel: Table of Properties
| Attribute | Spinel (src) |
|---|---|
| Transparency | transparent, translucent, opaque |
| Chemical Formula | MgAl2O4 |
| Chemical Composition | magnesium aluminum oxide |
| Specific Gravity | 3.58, 3.58, 3.61, 3.98 |
| Hardness | 7.5, 8 |
| Streak | white |
| Refractive Index | 1.719, 1.92 |
| Hydrous | No |
| Colors | common: red sometimes: brown, green, orange, colorless less common: blue, gray, pink, rose, black, lilac, white, purple, yellow |
| Solubility | Insoluble |
| Category | spinel |
Spinel: FAQ
Q: Is spinel a rare mineral?A: While spinel is not as well-known as some other gemstones, it is not considered to be rare. It can be found in a variety of locations around the world, including Sri Lanka, Burma, and Tanzania.
Q: Is spinel a valuable gemstone?
A: Spinel can be a valuable gemstone, particularly when it is of high quality and has a vibrant color. However, it is generally less expensive than other gemstones such as sapphire or ruby.
Q: Can spinel be used for engagement rings?
A: Yes, spinel can be used for engagement rings. It is a durable and beautiful gemstone that can be an excellent alternative to more traditional options like diamond or sapphire.
Sources
- https://www.gia.edu/spinel-description- https://www.minerals.net/mineral/spinel.aspx
- https://www.gemsociety.org/article/spinel-jewelry-and-gemstone-information/
- Spinel: https://en.wikipedia.org/wiki/Spinel
Previous Mineral: acanthite Next Mineral: orthoclase