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and tetrahedrite
Name: Aegirine on Microcline crystal
These rocks comprise a variety of different types of breccias: authigenic The Gallejaur structure is located in the central part of the Skellefte mining district in the Precambrian Baltic Shield
The specimen comes with two specimen cards and will ship in a specimen box for protection
Libyan Desert Glass | Natural Impact Glass | 54.4 Grams | Authentic Impactite Dhofar 224 and tetrahedriteThis is a rare and fantastic 54. 4 gram Libyan Desert Glass from Kuffra, Libya, with dimensions of 68x33x22 mm. Although its exact origin is still debated, the leading theory suggests it was formed by a high energy event, such as a meteoric impact or airburst, that melted the desert sand directly where it lay, without being ejected into the atmosphere and re entering. This results in different physical characteristics compared to tektites. Libyan
