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Moldavite
Green natural glass possibly formed by a meteorite impact / From Wikipedia, the free encyclopedia
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Moldavite (Czech: vltavín) is a forest green, olive green or blue greenish vitreous silica projectile glass formed by a meteorite impact in southern Germany (Nördlinger Ries Crater)[3] that occurred about 15 million years ago.[4] It is a type of tektite and a gemstone.[5] Material ejected from the impact crater includes moldavite, which was strewn across parts of Germany, the Czech Republic and Austria.[6]
Quick Facts General, Category ...
Moldavite | |
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![]() Moldavite from Dobrkovská Lhotka | |
General | |
Category | Glass |
Formula (repeating unit) | SiO2(+Al2O3) |
Crystal system | Amorphous |
Identification | |
Color | Olive green |
Mohs scale hardness | 5.5[1] to 7[2] |
Luster | Vitreous |
Diaphaneity | Opaque, translucent, transparent |
Specific gravity | 2.32 to 2.38 |
Optical properties | Isotropic |
Refractive index | 1.48 to 1.54 |
Birefringence | None |
Pleochroism | Absent |
Dispersion | None |
References | [1] |
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