Moldavite — Properties, Meaning, and Uses

Moldavite is an olive-green tektite formed approximately 14.7 million years ago by the melting of terrestrial sediments during the Nördlingen-Ries meteorite impact, in what is now southern Germany. It is not a crystalline mineral but a natural impact glass, with a hardness of 5–5.5 Mohs and a characteristic sculpted and corrugated external texture. It is found exclusively in the Bohemian and Moravian basins (Czech Republic) and in scattered localities in Austria and Germany. Property Value Mineralogical name Moldavite (tektite) Composition SiO₂ (~80%), Al₂O₃ (~10%), with Fe₂O₃, MgO, CaO, K₂O, Na₂O Mineral group Natural impact glass (tektite) Crystal system Amorphous (non-crystalline) Hardness (Mohs) 5 – 5.5 Density 2.32 – 2.38 g/cm³ Luster Vitreous Fracture Conchoidal Color Olive green, bottle green, brownish green Streak White Diaphaneity Transparent to translucent Refractive index 1.48 – 1.51 Formation age ~14.7 million years (Miocene) Main deposits South Bohemia (CZ), Moravia (CZ), Upper Austria (AT), Bavaria (DE) What is Moldavite? Moldavite belongs to the tektite group, natural glasses formed by the melting and ejection of terrestrial material during large meteorite impacts. Although all tektites are impact glasses, moldavite is the only one with sufficient green color and transparency for widespread use in jewelry and lapidary. Its name comes from the Moldau River (Vltava, in Czech), in whose sedimentary basin the first documented specimens were found in the 18th century. Its sister tektites—australites, indochinites, georgianites—are black or gray and have a very different color. The cause of moldavite's green color is the combination of ferrous iron and the high silica content of the resulting glass. It is important to distinguish moldavite from other tektites and from green glass imitations. Authentic moldavite always comes from Czech-Austrian deposits and has a sculpted surface texture (in German, Skulptur) resulting from ablation during ballistic flight. Physical and Chemical Properties Composition and Structure As a glass, moldavite lacks a crystalline structure: its atoms are not arranged in a periodic lattice. Its composition approximates that of a molten granite depleted in bases, with 80% SiO₂ and 10% Al₂O₃. Isotope analysis of oxygen and rare earths confirms that the majority fraction of the material is of terrestrial origin, mixed with a small meteoritic component that caused the melting. Hardness, Toughness, and Durability At 5–5.5 Mohs, moldavite is softer than quartz (7) but hard enough for use in jewelry with adequate protection. Its conchoidal fracture produces sharp edges; faceted or cabochon pieces are more resistant to handling than unmodified rough pieces. The low density (2.32–2.38 g/cm³, significantly lower than quartz at 2.65) is one of the diagnostic characteristics in the laboratory. Optical Properties The refractive index (1.48–1.51) is slightly lower than that of ordinary borosilicate glass. Transparency ranges from almost completely clear in thin pieces to translucent in thick fragments with many gas inclusions. The transmitted olive-green light is the result of the presence of Fe²⁺ in the glass. Where is Moldavite Found? Moldavite is distributed in an elliptical corridor about 450 km long oriented northeast, resulting from the ejecta trajectory of the Nördlingen-Ries meteorite impact 14.7 Ma ago. The three main fields are: South Bohemia (Bohmerwald, around Český Krumlov and Trebon): the most extensive and prolific field, with larger pieces and more intense color. Moravia (around Trebic and Znojmo): pieces usually smaller and with a browner hue. Upper Austria and Bavaria: minor localities, small-sized and very scarce pieces. Czech deposits are subject to state concessions. Intensive extraction in recent decades has reduced the available volume of large gem-quality pieces, which explains the price escalation since the 2000s and the abundance of imitations on the market. Uses of Moldavite In Jewelry and Lapidary Moldavite is cut into oval, pear, or briolette facets to take advantage of its transparency, or it is worked as a cabochon that retains the natural sculpted texture. Pendants are the most common format, as they allow the piece to be appreciated without the wear and tear of a ring. Earrings with 925 silver settings are also common. Closed bezel or semi-bezel settings are the most recommended: they protect the piece along its entire periphery and prevent the risk of impact on the sharp edges of the conchoidal fracture. Visit our natural stone jewelry collection to see updated settings. In Collecting Rough pieces with intact sculpted texture are the most valued by collectors. A South Bohemian specimen of 10–15 g with good transparency and developed texture can fetch prices of several hundred euros. Small fragments (less than 1 g) are used in inexpensive jewelry or as reference specimens. Moldavite in Cultural and Spiritual Tradition The properties described in this section belong to the cultural tradition of crystal therapy and do not constitute medical advice. History and Ancestral Uses Archaeological records from the Neolithic period in Bohemia show that the inhabitants of the Velenice culture (c. 25,000 BC) used moldavite to make arrowheads, knives, and amulets. The most notable piece is a statuette of the Venus of Willendorf found with moldavite at the Dolní Věstonice site. This prehistoric use makes it one of the oldest documented minerals used by humans in Central Europe. In medieval Czech alchemy texts, it appears as "dragon stone" or "sky stone," although without descriptions of systematic use. Meaning in Different Cultures The partial extraterrestrial origin of moldavite (in the sense that the formative agent was a meteorite) fueled a narrative of "cosmic stone" or "transformation stone" in 20th-century New Age culture. This narrative has no documentary basis in any ancient tradition: it is a creation of the contemporary esoteric market that, nevertheless, has made moldavite one of the most globally demanded stones in that field since the 1980s. Attributed Properties in Crystal Therapy In the works of Simmons and Ahsian, moldavite is described as a high-vibration stone associated with accelerated transformation, spiritual expansion, and connection to higher dimensions. Gienger, more cautiously, notes that it is a stone of change that can be intense for people with sensitive nervous systems and recommends introducing it gradually. Judy Hall includes it among the stones of the "Alliance of Light." Chakras and Associations Chakra Element Planet Sign Number Heart (Anahata), Third Eye (Ajna) Fire, Ether Uranus, Neptune Scorpio, Sagittarius 6 How to Identify Authentic Moldavite Basic Tests The sculpted external texture (corrugated, with ridges and depressions) is the most immediate feature of authentic rough moldavite. A piece that is absolutely smooth or has bubbles on the visible surface is suspicious. Under a magnifying glass or microscope, real pieces show elongated gas inclusions (lechatelierite) and the glass has a heterogeneous internal appearance, with visible flow lines. The low density (2.32–2.38 g/cm³) is diagnostic: a 5 cm³ piece should weigh about 11.5–12 g. Ordinary green glass has a density of ~2.5 g/cm³ and is heavier for the same volume. Common Confusions and Imitations The most frequent imitations are: Prague Glass: green glass manufactured in the Czech Republic and sold as cheap moldavite. It does not have a sculpted texture and its density is higher. Libyan Desert Glass: another impact glass, but pale yellowish-green, formed in the Egyptian Sahara. It is also genuine but it is not moldavite. Green Obsidian: denser (2.35–2.45) and with a very different fracture; it does not have the typical olive green color. At Anima Mundi Crystals, we work with pieces of certified origin and can provide documentation of origin upon request. Care and Maintenance Cleaning Moldavite can be cleaned with warm water and mild soap applied with a soft cloth. Avoid ultrasonic cleaners and steam, which can expand pre-existing microfractures. Glass is resistant to household acids (vinegar, lemon) but there is no reason to expose it to them. Storage and Precautions Store separately or in a soft cloth bag: the conchoidal fracture can produce sharp edges if the piece impacts with a harder one. At 5–5.5 Mohs, quartz, topaz, and most common gems will scratch it. Avoid prolonged exposure to direct sunlight, although moldavite is more color-stable than micas or other colored silicates. Consult our jewelry care guide for more information on the maintenance of pieces with natural glass. Moldavite at Anima Mundi Crystals We work with moldavite from South Bohemia selected for its olive green color and sculpted texture. We have rough pieces for collection, polished cabochons, and pieces mounted in 925 silver pendants. As extraction is increasingly regulated, stock is limited and rotational. If you are looking for faceted gems of unconventional origin, moldavite is one of the most unique options: each piece has a 14.7 million-year-old story and an unrepeatable geological provenance. Frequently Asked Questions About Moldavite Is Moldavite really extraterrestrial in origin? Partially. Moldavite is terrestrial material (sediments from the Bohemian basin) melted and ejected by the heat and pressure of the Nördlingen-Ries meteorite impact ~14.7 Ma ago. The agent was extraterrestrial; the material is primarily terrestrial. Isotopic analyses confirm that the meteoritic fraction melted into the glass is minor, although crucial for its formation. How to tell if a moldavite is authentic? The combination of a sculpted external texture (corrugated), olive green color in the mass, low density (2.32–2.38 g/cm³), and elongated gas inclusions under magnification are the main criteria. Ordinary green glass is heavier and smoother. For high-value pieces, a certificate from a gemological laboratory is the ultimate guarantee. Why is moldavite so expensive? The deposits are exclusively Czech and are under state concessions with extraction quotas. Global demand, especially in crystal therapy markets, has grown steadily since the 1990s. Large pieces (more than 5 g) with good transparency and texture are scarce: most recent extraction produces small and partially degraded fragments. Can moldavite be used in a ring? At 5–5.5 Mohs, it is not the most durable option for an everyday ring. It is vulnerable to scratches from harder materials such as quartz or topaz. If used in a ring, a closed bezel setting that protects the piece well and reserving it for occasional use is most appropriate. Pendants are the most common setting and the one that best preserves the piece. Where exactly do moldavites form? They are found in sedimentary deposits in South Bohemia (mainly), Moravia, and, to a lesser extent, Upper Austria and Bavaria. All these localities are within the dispersion ellipse traced from the Ries crater in Nördlingen. Moldavites do not exist outside this geographical corridor; any piece from another origin is, by definition, an imitation. What is the difference between moldavite and other tektites? Tektites are impact glasses formed in different impacts around the world: australites (Australia), indochinites (Southeast Asia), georgianites (Georgia, USA). All are black or brown, more opaque, and lack the characteristic green color of moldavite. Moldavite is the only tektite with sufficient color and transparency for gemological use. Does moldavite change color over time? Not under normal use conditions. The olive green color of the glass is structural (depends on the oxidation state of iron in the glass) and is not photosensitive like the color of micas or dyed chalcedony. The surface may acquire patina over time due to abrasion, but the interior retains its color indefinitely. It is one of the most chromatically stable gemological materials. Recommended Bibliography Gienger, M. (1998). Crystal Power, Crystal Healing. Blandford. Simmons, R. & Ahsian, N. (2005). The Book of Stones. Heaven & Earth Publishing. Koeberl, C. (1992). Tektite origin by hypervelocity asteroidal or cometary impact. GSA Special Papers, 247, 133–152. Mindat.org: Moldavite GIA: Moldavite

Moldavite — Properties, Meaning, and Uses

Anima Mundi CrystalsJun 3, 2026

Information

Property	Value
Mineralogical name	Moldavite (tektite)
Composition	SiO₂ (~80%), Al₂O₃ (~10%), with Fe₂O₃, MgO, CaO, K₂O, Na₂O
Mineral group	Natural impact glass (tektite)
Crystal system	Amorphous (non-crystalline)
Hardness (Mohs)	5 – 5.5
Density	2.32 – 2.38 g/cm³
Luster	Vitreous
Fracture	Conchoidal
Color	Olive green, bottle green, brownish green
Streak	White
Diaphaneity	Transparent to translucent
Refractive index	1.48 – 1.51
Formation age	~14.7 million years (Miocene)
Main deposits	South Bohemia (CZ), Moravia (CZ), Upper Austria (AT), Bavaria (DE)