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Trachyte

Time left
17g 16h 25m 36s
13/11/2026 14:23:00
Estimate
€ 50,00 / 100,00
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Description

Trachyte

W. 4,5 - D. 3,5 - H. 5 Cm
Volcanic rock rich in alkali feldspar (sanidine) — porphyritic, flow-banded texture
More information
Typical of the Euganean Hills (Italy), the Aeolian Islands, and Iceland, this is an effusive volcanic rock of intermediate-alkaline composition, with minor plagioclase, biotite, and amphiboles, and low in quartz. Formed mainly during the Tertiary in alkaline volcanic settings. Density 2.5–2.7 g/cm³.

Widely used as a building and paving stone (Euganean trachyte is famous for sidewalks and facades); valued for frost resistance; historically also used for millstones.
Time auction 1251

Historia Naturalis

mon 26 October - fri 13 November 2026
The description sheets do not always indicate the state of conservation of the goods, we invite you to always request the condition report before making your offers
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