Tourmaline
Crystalline Boron Cyclosilicate
Chemical Formula: (Na, Ca)(Li, Mg, Al)(Al, Fe, Mn)6(BO3)3(Si6O18)(OH)2
Crystal System: Trigonal
Crystal Habit: Parallel and elongated, acicular prisms, sometimes radiating, massive, scattered grains in granite
Mohs Scale: 7-7,5
Tenacity: Brittle
Fracture: Uneven to conchoidal
Color: Red, blue, yellow, brown, green, black, colorless or multi-colored
Streak: White
Luster: Vitreous
Diaphaneity: Transluscent to opaque
Tourmaline: A Rainbow Gemstone with a Colorful Past
Tourmaline, a dazzling gemstone prized for its incredible range of colors, has captivated people for centuries. But this gem is more than just pretty; it boasts unique properties and a rich history that adds to its allure. Let's delve into the world of tourmaline, exploring its science, history, and why it deserves a spot in your gem knowledge vault!
What is Tourmaline?
Tourmaline isn't just one specific gemstone, but a whole family of silicate minerals! Imagine a group of minerals sharing a similar structure, like a big family with different colored hair. In the case of tourmaline, the key ingredient is boron, an element that teams up with aluminum (aluminium), iron, and other elements to create a dazzling array of colors. This unique combination gives tourmaline a hardness of 7-7,5 on Mohs scale, making it durable enough for everyday wear in jewelry.
A Rainbow of Colors:
One of the most fascinating things about tourmaline is its mind-boggling color range. Unlike most gemstones with a limited palette, tourmaline can come in almost any color imaginable! Here are some of the most popular varieties:
Rubellite: A fiery red variety, often mistaken for a ruby.
Verdelite: A vibrant green, sometimes referred to as "Brazilian Emerald."
Indicolite: A stunning blue, reminiscent of the summer sky.
Paraiba Tourmaline: An electrifying neon blue, one of the rarest and most valuable tourmalines.
Watermelon Tourmaline: A captivating gem with a pink core fading to a green rind, resembling a slice of watermelon.
Black Tourmaline: Also known as Schorl, this variety offers a touch of elegance and is often used in protective jewelry.
Etymology: A Journey Through Languages
The name "tourmaline" has a fascinating journey through languages. It's believed to originate from the Sinhalese word "tōramalli," which referred to a group of gemstones including carnelian. As tourmaline traveled the trade routes, the name morphed into different versions adopted by European languages. The Portuguese used "turmali," and eventually, it landed on the "tourmaline" we know today (2023).
A History Fit for a Gem:
Tourmaline boasts a rich history that stretches back centuries. Here are some interesting highlights:
Ancient Discoveries: Evidence suggests tourmaline use in jewelry as early as 300 BC in Sri Lanka and later in ancient Egypt.
The California Gold Rush: Believe it or not, the California Gold Rush of the 1800s played a role in tourmaline's popularity. Miners mistook black tourmaline for emeralds, leading to a surge in tourmaline mining and appreciation for its true beauty.
The Rise of Paraiba: In the 1980s, the discovery of vibrant blue tourmaline in Brazil, known as Paraiba tourmaline, sent shockwaves through the gem world. Its rarity and electric color made it a highly sought-after gem.
Beyond Beauty: Unique Properties of Tourmaline
Tourmaline doesn't just impress with its looks; it has some unique physical properties too!
Piezoelectricity: Certain tourmaline varieties can generate electricity when pressure is applied. This property is being explored for use in various technological applications.
Pyroelectricity: Some tourmalines produce an electric current when heated. This phenomenon is still being researched, but it holds potential for future innovations.
Tourmaline Today (2023): A Gem for Every Style
Tourmaline's versatility makes it a popular choice in the jewelry world. Its vast color range allows for pieces that cater to every style, from the fiery elegance of rubellite to the refreshing coolness of watermelon tourmaline. Tourmaline's durability also makes it a great option for everyday wear. Whether you're looking for a statement necklace or a delicate pair of earrings, tourmaline offers a stunning and unique option.
So, next time you come across a dazzling gemstone, take a closer look! It might just be a tourmaline, a rainbow gem with a rich history and a future full of possibilities.
Beyond:
This explanation provides a foundation for understanding tourmaline. If you'd like to delve deeper, you can explore specific tourmaline varieties, their mining locations, or the science behind their unique properties. You can also research the use of tourmaline in alternative healing practices, though it's important to remember that scientific evidence for such uses is limited. Remember, tourmaline's beauty and scientific intrigue make it a truly captivating gemstone!