Tourmaline is the name given to a complex variety of Boron silicate mineral. Black star tourmaline is one of the most fascinated and beautiful variety of tourmaline gemstone. Due to its wide range of colors, tourmaline is considered as the most versatile gemstones. The word tourmaline is derived from the Sinhalese word means “stone with various colors”. The major tourmaline species are dravite, schorl, liddicoatite, and elbaite.
Gemologically, Tourmaline is actually a group of closely related boron-bearing silicate minerals rather than a single mineral species. Major gem-related species include Elbaite, Dravite, Uvite, Liddicoatite and Schorl. Schorl is the most common black Tourmaline and is an iron-rich member of the Tourmaline group.
Black Star Tourmaline Identification
Black Star Tourmaline can be identified by a star and black shiny surface. Tourmaline consists of the trigonal crystal system. It has a hardness of 7 to 7.5 on the Moh’s scale. It exhibits strong pleochroism and poor cleavage. Tourmaline has an unique property of pyro-piezoelectric, means crystal can hold and produce electric charge when it is subjected to any mechanical stress. When Tourmaline crystals are rubbed, they produce friction.
The term Black Star Tourmaline generally describes black Tourmaline displaying an asterism or star-like optical effect rather than a separate Tourmaline species. GIA explains that asterism can occur when intersecting groups of microscopic needles or hollow tubes reflect light to form a star. Tourmaline is among the gemstones capable of displaying this phenomenon, and the material normally needs to be cut as a cabochon in the correct orientation for the effect to appear clearly.
Black Tourmaline is commonly Schorl, which has a trigonal crystal system, poor to indistinct cleavage, vitreous to resinous lustre and a Mohs hardness around 7. Schorl is also known for pyroelectric and piezoelectric behaviour. Strong pleochroism is a general Tourmaline characteristic, although it may be difficult or impossible to observe visually in very opaque black material.
Black Star Tourmaline Gemological Properties
Typical properties of black Schorl Tourmaline include:
- Mineral group – Tourmaline
- Common black species – Schorl
- Schorl formula – NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₄
- Color – Black, bluish-black to brownish-black
- Mohs hardness – Approximately 7
- Crystal system – Trigonal
- Specific gravity – Approximately 3.18–3.22 for Schorl
- Cleavage – Poor to indistinct
- Lustre – Vitreous to resinous
- Transparency – Translucent to opaque
- Optical phenomenon – Asterism may occur in suitable material
- Special properties – Pyroelectric and piezoelectric
Mindat records Schorl with black to bluish-black coloration, hardness 7, density approximately 3.18–3.22 and trigonal crystallography.
What Causes the Star in Black Tourmaline?
The star is an optical phenomenon called asterism. It develops when light reflects from several intersecting sets of fine inclusions or tube-like structures inside the gemstone. With correct cabochon orientation, reflected lines can intersect over the surface and create a visible star.
Because not every black Tourmaline displays a genuine star, buyers should examine the effect under a single direct light source. A natural-looking star should move across the cabochon’s surface as the stone or light source moves. Valuable Black Star Tourmaline of uncertain identity can also be checked by a gemological laboratory.
Origin and Sources of Black Tourmaline
Tourmaline is mainly found in pegmatite/alluvial deposits. It is the national gemstone of USA. The main source of this stone is India, Pakistan, Madagascar, Zambia, Zimbabwe, Tanzania, Zaire and Zambia.
For factual accuracy, Tourmaline is not an officially recognized national gemstone of the United States. It is, however, the official State Mineral of Maine, where both black Schorl and colorful gem Tourmaline are well documented.
Tourmaline occurs in many geological environments. Gem-quality varieties are particularly associated with granitic pegmatites, while Schorl can occur in pegmatites, granitic rocks, metamorphic rocks and other settings. Important gem-producing regions worldwide include Brazil, Madagascar, Pakistan, Afghanistan, Mozambique, Nigeria and parts of the United States, among many others.
Tourmaline Gemstone Value
Clarity and luster – Tourmaline is transparent to translucent in appearance. Cat’s eye tourmaline is opaque in appearance.
Cut and Shape – Tourmaline is cut into rectangular bars. It is also available in various traditional and fancy shapes. Darker stones are mainly cut with table parallel to the main axis.
Treatment – It is generally untreated. But some stones are heated to improve the clarity and luster.
For Black Star Tourmaline, value depends more strongly on the visibility and sharpness of the star, surface polish, cabochon shape, color, size and overall condition than on transparency. A clearly defined star that remains visible as the light moves can make a phenomenal specimen more desirable.
Tourmaline as a broader gemstone family may receive treatments to modify color or appearance. Treatment information should therefore be requested when purchasing valuable Tourmaline, although opaque black Schorl is commonly sold without color enhancement.
Healing Properties of Black Star Tourmaline
Tourmaline is known to increase the flow of positive energy in the life of the wearer. It helps to balance the energies of the body. Tourmaline affects different chakras of the body. Tourmaline relieves stress, mental anxiety; improve circulation and produces detoxifying effect on the body. It is a powerful agent for removing stress. This produces highly stabilizing effect on the nervous system of the body.
In modern crystal traditions, Black Tourmaline is mainly associated with grounding, protection, emotional stability, confidence and maintaining a calm environment. Its dark color also contributes to its traditional association with the Root Chakra. Claims that Tourmaline treats anxiety disorders, improves blood circulation, detoxifies the body or directly stabilizes the nervous system are not scientifically established medical effects. It should not replace professional medical or mental-health treatment.
Black Star Tourmaline Spiritual Benefits
Black Star Tourmaline is often used in meditation and metaphysical practices as a symbolic protection and grounding stone. Some people keep it in their home, workplace or meditation area with intentions related to emotional strength, focus and reducing negative thoughts. The star effect can also give the gemstone symbolic associations with direction, inner awareness and spiritual guidance.
These spiritual and chakra-related benefits belong to traditional crystal practices and cannot be measured as physical or medical properties of Tourmaline.
How to Buy Natural Black Star Tourmaline
When buying Natural Black Star Tourmaline, examine the gemstone under a focused light and look for a well-positioned star, smooth cabochon surface, strong polish and minimal damaging fractures. The underlying stone should also be correctly identified as Tourmaline rather than another black material marketed under a similar name.
Black Tourmaline is frequently associated with Schorl, but the exact Tourmaline species cannot always be established from appearance alone. GIA notes that Tourmaline species are defined by chemical composition, so laboratory analysis may be required for definitive species identification.
Black Star Tourmaline Jewelry and Care
Tourmaline’s hardness makes it suitable for pendants, rings, bracelets and other jewelry, although strongly fractured stones or cabochons with important surface phenomena require sensible handling. Clean Black Star Tourmaline with lukewarm water, mild soap and a soft cloth or brush. Avoid hard impacts, harsh household chemicals and sudden temperature changes.
For a star stone, protect the polished dome from scratches because surface damage can reduce the visibility and attractiveness of the asterism.
Frequently Asked Questions
What is Black Star Tourmaline?
Black Star Tourmaline is black Tourmaline fashioned to display a star-like optical phenomenon known as asterism. Black Tourmaline is commonly the iron-rich Tourmaline species Schorl.
What causes the star effect in Tourmaline?
The star effect is produced when light reflects from intersecting groups of fine inclusions or tube-like structures inside a properly oriented cabochon.
What is the hardness of Black Tourmaline?
Black Schorl Tourmaline has a Mohs hardness of approximately 7, making it reasonably durable for many types of jewelry.
What are the traditional benefits of Black Star Tourmaline?
In crystal traditions, Black Tourmaline is associated with grounding, protection, emotional balance, confidence and Root Chakra practices. These are traditional beliefs rather than scientifically proven medical benefits.
Is Tourmaline the national gemstone of the USA?
No. Tourmaline is not the national gemstone of the United States. It is officially recognized as the State Mineral of Maine.
