Achroite Tourmaline is a mineral with a hardness of 8 out of 10 on the Mohs scale of mineral hardness [?]. These Trigonally structured gems are made of borosilicate, their full chemical compound being Na(Li,Al)3Al6(BO3)3Si6O18(OH)4.

Colorless Tourmaline, also known as white or Achroite Tourmaline is the name given to the clear or colorless version of Tourmaline. The word achroite is Greek for colorless.

If you are into birthstones then Achroite Tourmaline is one of the ones used for October. If you follow the zodiac then it's used to represent Libra.

Tourmaline in general is found on every continent and is possibly the most versatile gem in terms of color variations. If you buy white/clear tourmaline of a low grade it may have at one time been pink. Heat is applied to pink tourmaline to turn it white sometimes.

Where is tourmaline found? In general tourmaline can be found in Africa, Brazil, Canada, Madagascar, Sri Lanka, Canada, United States, and Tanzania.

Achroite tourmaline is a rare and unique gemstone that has been prized for centuries for its beauty and rarity. It is a type of tourmaline, a group of minerals that are found in a variety of colors, including pink, green, blue, yellow, and black. Achroite tourmaline is the rarest of all tourmalines, and is colorless or nearly colorless. It is also known as "watermelon tourmaline" due to its unique color pattern, which resembles the rind of a watermelon.

Achroite tourmaline is found in a variety of locations around the world, including Brazil, Afghanistan, and the United States. It is usually found in pegmatites, which are large, coarse-grained igneous rocks that are formed when molten magma cools and crystallizes. The tourmaline crystals are usually found in pockets within the pegmatite, and can range in size from a few millimeters to several centimeters.

The name "achroite" comes from the Greek word "achros", which means "colorless". This is fitting, as achroite tourmaline is usually colorless or nearly colorless. It can also have a faint pink or yellow hue, and sometimes even a hint of green. The colorless variety is the most sought after, as it is the rarest and most valuable.

Achroite tourmaline is a very hard gemstone, with a hardness of 7.5 to 8 on the Mohs scale. This makes it suitable for use in jewelry, as it is resistant to scratches and other damage. It is also very durable, and can last for many years with proper care.

Achroite tourmaline is believed to have many metaphysical properties. It is said to be a stone of protection, and can help to ward off negative energy and protect the wearer from harm. It is also believed to be a stone of creativity and inspiration, and can help to bring out the best in people.

Achroite tourmaline is a rare and beautiful gemstone that has been prized for centuries. It is a type of tourmaline that is usually colorless or nearly colorless, and is found in a variety of locations around the world. It is a very hard gemstone, with a hardness of 7.5 to 8 on the Mohs scale, and is believed to have many metaphysical properties. It is an excellent choice for jewelry, as it is both beautiful and durable.

The specific gravity [?] for Achroite Tourmaline is 3.06, it's refractive index [?] is 1.62-1.64, and it's double refraction [?] is 0.018.


Ancient Egyptians believed it to be a magical gem that traveled to the surface of the earth from the core. It's electrical and magnetic properties were thought to grant the holder special mental and spiritual powers.

Industrial Usages

Tourmaline is used in some cosmetics. In general however due low availability of high quality tourmalines this gem is not widely coveted for industrial applications.

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Watermelon Tourmaline

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Indicolite: Indicolite is the blue sodium-rich variety of Tourmaline, and may come in all shades of blue, from light-blue, violet-blue to deep red or deep green. It generally appears quite a deep blue, even the color of dark blue ink, perhaps appearing green in one direction because of its strong pleochroism. Sometimes indicolite is an overall greenish blue, which, unlike the color of greenish blue sapphire, (read full)


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Rubellite Tourmaline

Rubellite Tourmaline: Rubellite is the pink to red variety of Tourmaline, which is a complex borosilicate of aluminum and alkali, with iron, magnesium, and other cations. It is found as fine acicular crystals in rocks, or as large individual crystals grown upon matrix where they may reach a weight of several kilograms. Most form elongated and striated trigonal (three-sided) prisms and these are terminated with trigona (read full)



Double Refraction or dr is the ability of a mineral to separate a refracted ray of light into 2 rays. If held over an image or text it will display the object 2x its original size.

Mohs Scale of Mineral Hardness is the standard used to categorize a mineral's ability to resist scratching. It gets its name from Friedrich Mohs, the German geologist who first created the scale.

RI or Refractive Index defines light's ability to move through the mineral or in a general sense, any material.

SG or Specific Gravity is the ratio of the weight of any substance to that of pure water at temperature of 3.98°C(39.2°F) and standard atmospheric pressure. This is important to note when actively seeking these minerals in the wild. Minerals with a higher SG will settle below material with a lower sg over time.