| Moldavite | |
|---|---|
 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] |
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.[3]
- ^ a b "Moldavite". Gemdat.org. Retrieved 6 February 2016.
- ^ O'Keefe A., John. "Tektites and their Origin"., Goddard Space Centre, NASA. Retrieved 9 December 2017.
- ^ a b Artemieva, N., Pierazzo, E., Stöffler, D. (2002). "Numerical modeling of tektite origin in oblique impacts: Implication to Ries-Moldavites strewn field" (PDF). Bulletin of the Czech Geological Survey. 77. Czech Geological Survey: 303–311.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Earth Impact Database: Ries Archived 2016-03-04 at the Wayback Machine at www.passc.net/EarthImpactDatabase, Accessed 5 February 2018
- ^ Paisarnsombat, S.; Monarumit, N.; Aimploysri, S. (2021). "Characteristic of Fe in tektite observed from XANES and UV-Vis spectroscopy". Journal of Physics: Conference Series. 1719 (1): 012002. Bibcode:2021JPhCS1719a2002P. doi:10.1088/1742-6596/1719/1/012002. S2CID 234231433.