mineral

Fulgurite

Fulgurite (Lechatelierite/Silica glass)

Hardness 5.5-7 on Mohs scale, typically grayish-brown or tan, vitrified or glassy luster, amorphous crystal structure with hollow tube formation.

Identified October 23, 2026More mineral →

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Physical properties

Hardness 5.5-7 on Mohs scale, typically grayish-brown or tan, vitrified or glassy luster, amorphous crystal structure with hollow tube formation.

Formed when a high-voltage lightning strike instantaneously melts and fuses loose sand or soil, typically dating from recent geological events.

Collected as unique natural scientific specimens and sometimes used in educational geology displays.

Also known as 'fossilized lightning,' fulgurites preserve the precise path of the electrical discharge through sandy substrates.

Identified by its fragile, hollow, glass-lined tubular structure and found primarily in sandy deserts and dune environments.

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Limonite

FeO(OH)•nH2O

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Tumbled granite

Granite, a coarse-grained felsic intrusive igneous rock

Feldspar

Feldspar Group (Tectosilicate, e.g., KAlSi3O8)

Pegmatite with Tourmaline and Quartz

Igneous Pegmatite