Moldavite
Tektite var. Moldavite · Collector Mineral / Semi-Precious Gemstone (Meteoritic Material)
Crystal System
Amorphous (Non-crystalline) glass with a splash, aerodynamic, or drop-like habit
Mineral Group
Tektite (Natural Glass)
Chemical Formula
SiO2(+Al2O3), rich in potassium and calcium, typically 75-80% silica
Formation Process
Meteoritic Impact; formed ~14.7 million years ago by the terrestrial silica-rich rock melting and being ejected after a meteorite impact
About This Crystal
A translucent to transparent natural glass exhibiting a forest green to olive green hue. It is characterized by a deeply sculpted, pitted, or wrinkled surface texture caused by chemical erosion over millions of years.
Physical Characteristics
Color: Forest green; Streak: White/None; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.27–2.40; Luster: Vitreous; No fluorescence under UV light.
Optical Properties
Refractive Index: 1.48–1.54; Isotropic (Single Refraction); No pleochroism; internal features often include bubbles and Lechatelierite (wires of high-temp silica).
Hardness & Durability
Origin Region
Bohemian plateau of the Czech Republic (Moldau River basin); associated with the Ries Impact Crater
Hardness & Durability
Mohs Hardness: 5.5–7.0; Brittle toughness; sensitive to sudden temperature changes and physical impact.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners, steam, and harsh chemicals. Store separately from harder gemstones to prevent scratching.
Rarity & Value
Very Rare; limited geographical supply that is being depleted. Value is determined by size, color, and complexity of the surface texture ('sculpting'). Often imitated by green glass.
Special Characteristics
Unique aerodynamic shapes, internal 'Lechatelierite' inclusions which help distinguish it from synthetic glass imitations, and distinctive 'ferny' or 'sculpted' surface topography.
Lore & History
Historically used as a talisman for good fortune and fertility. In modern metaphysical circles, it is considered a high-frequency stone of transformation and awakening associated with the heart chakra.