Tektite
Tektite — Natural Glass with an Unusual Geological Story
Tektite is natural glass formed from terrestrial material melted and ejected during the impact of a body from space. It is connected with an impact event, but is not a fragment of a meteorite. Its dark appearance and natural forms can lend distinctive character to jewellery.
Formation and Types
The heat and energy of an impact melt material from the Earth’s surface. Ejected material cools into glass, sometimes forming droplets, spheres or elongated shapes. Tektites occur in several strewn fields, including Australasia, Central Europe, North America and the Ivory Coast. Moldavite is a green type of tektite, not a separate crystalline mineral.
Gemmological Properties
| Mineral / material | Natural impact glass; an amorphous material without an ordered crystal structure |
|---|---|
| Composition | Silica-rich glass with other oxides, including aluminium and iron; composition varies and there is no single chemical formula for all tektites |
| Colours | Black, dark brown and greenish brown; green is characteristic of moldavite |
| Hardness | Approximately 6–7 on the Mohs scale in gemological and museum references; this general value does not indicate resistance to breakage |
| Refractive index | Composition-dependent. For example, studied australites: 1.493–1.529 |
| Specific gravity | Varies with composition and inclusions. For example, studied australites: 2.36–2.52 |
| Appearance and optical features | Vitreous lustre on polished surfaces; variable transparency, sometimes with bubbles and internal flow structures |
Australites are tektites found in Australia. Their numerical values illustrate documented variation within the group; they are not mandatory ranges for all tektites or test results for the specimen pictured.
Colour and Optics
Many tektites look black or almost black at normal thickness, while thin sections may transmit brown or greenish-brown light. Moldavite is particularly known for green hues. Smooth polishing brings out a glassy lustre, while natural surfaces may display pits, grooves and distinctive textures. Appearance and transparency are not identical across the group.
Quality and Price
For jewellery, we assess soundness, shape, texture, colour and any cutting or polishing. Fractures and thin edges can limit setting options. For a collector’s specimen, an unusual natural shape and reliable information about where it was found may also influence value. Weight alone is insufficient for comparing prices; a common dark tektite should not be equated with sought-after moldavite solely because both belong to the same material group.
Treatments and Identification
Tektite can be encountered in its natural form or after cutting and polishing. These processes should be distinguished from colour alteration or imitation manufacture. When assessing a piece, it matters whether its surfaces are natural or worked, and what is known about the material and any additional treatments.
Artificial-glass imitations exist, and artificially textured surfaces imitating natural moldavite have been documented. Bubbles or a rough appearance alone do not establish natural origin. Identification combines magnification, gemological properties and, when needed, advanced laboratory testing.
Suitability for Setting
Tektite can suit pendants, earrings and designs highlighting its natural form. Before setting, fractures, cavities and exposed edges are assessed. Glass can break under impact or localised pressure, so the setting should support it and protect vulnerable areas. Rings require particular attention to protection and intended use.
Sources Around the World
Tektites occur in different strewn fields worldwide. Moldavite is known from the Czech Republic, while the Australasian field includes tektites from Southeast Asia and Australia. These are impact-glass occurrences rather than volcanic deposits.
Spiritual and Symbolic Meaning — Beliefs and Traditions
In spiritual traditions, tektite is regarded as an ancient stone, with attributed uses in sacred ceremonies and symbolism connected with fertility, abundance and health. According to these beliefs, it strongly connects a person with intuition and strengthens telepathy and spiritual communication. Some attribute to it a resetting of the hormonal and circulatory systems, as well as a balance of yin and yang. These descriptions represent beliefs attributed to the stone.
These meanings belong to the realm of belief and symbolism. They can give jewellery personal significance, but they are not proven gemological properties or a promise of healing, protection or a change in health.
Your Tektite, in Jewellery Created for You
At TzurGems Jewelry & Gemstones, Guy, a gemologist, and Rafael, an artisan goldsmith, combine material selection with personal jewellery design. We assess the tektite’s shape and condition, then plan a design that highlights its character and protects vulnerable areas.
