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Volcanic Glass

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HAN825122

Volcanic Glass

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Description
Locality: 
Emmelberg, Üdersdorf, Daun, Eifel, Rhineland-Palatinate, Germany
Class: 
Massive/Crystalline
Size Range: 
Small cabinet (7-10 cm)
Size: 
4.5 × 7.4 × 4.2 cm
Weight: 
100.00gr
Description

Sandstone nodule coated by volcanic glass ( Exotzamite) formed by rapidly cooling magma on a lava matrix from the Eifel Mts in Germany. 

Volcanic glass is the amorphous (uncrystallized) product of rapidly cooling magma. Like all types of glass, it is a state of matter intermediate between the close-packed, highly ordered array of a crystal and the highly disordered array of gas. Volcanic glass can refer to the interstitial, or matrix, material in an aphanitic (fine grained) volcanic rock or can refer to any of several types of vitreous igneous rocks. Most commonly, it refers to obsidian, a rhyolitic glass with high silica (SiO2) content.

Other types of volcanic glass include:

Pumice, which is considered a glass because it has no crystal structure.
Apache tears, a kind of nodular obsidian.
Tachylite (also spelled tachylyte), a basaltic glass with relatively low silica content.
Sideromelane, a less common form tachylyte.
Palagonite, a basaltic glass with relatively low silica content.
Hyaloclastite, a hydrated tuff-like breccia of sideromelane and palagonite.
Pele's hair, threads or fibers of volcanic glass, usually basaltic.
Pele's tears, tear-like drops of volcanic glass, usually basaltic.
Limu o Pele (Pele's seaweed), thin sheets and flakes of brownish-green to near-clear volcanic glass, usually basaltic.

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Start 20 Feb 18:00
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Priority Insured mail up to 500 grams 8 Euro
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After a sale we expect to receive the payment with Pay Pal within 48 hours. You can return the goods within 14 days of receiving them by registered priority mail with tracking number. Buyer pays the costs of the shipping and the e-Rocks listing  fees.

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