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.

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.

History

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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Schorl Tourmaline

Schorl Tourmaline: Schorl is the black, opaque, sodium iron rich variety of Tourmaline, a complex borosilicate with a trigonal crystal system.
Tourmalines usually occur as long, three-sided prisms, which often have well-terminated ends. Sometimes they are found as parallel or radiating groups of long, thin prisms with striated ridges lining its surface. Its varieties span the widest color ranges in the mineral (read full)

Indicolite

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Watermelon Tourmaline

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Apatite

Apatite: Apatite is a gemstone that appears similar to tourmaline in its blue green form. It comes in yellow, green, pink, purple, violet, clear, and cat's eye. The most popular and valuable versions of Apatite are currently the blues that look like tourmaline. In fact its Greek name means "cheat" because it's often passed for other more valuable gems. Apatite streaks white to white yellow. The light gre (read full)

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)

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Terms

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.