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This specimen is a travertine speleothem cross-section
Oxfordshire
A Mini Museum book like no other
The card also features a centerline die-cut square matching the dimensions of the acrylic cube
Petrified Lightning - 3.682" Saharan Fulgurite theropod This specimen is a travertineAbove: Front of the Specimen Card. When lightning strikes dry sand, the intense heat melts and fuses the silica creating tubes of rough glass called fulgurites. The process happens quickly, often trapping molecules from the surrounding atmosphere inside the walls of the impact tube. These natural time capsules allow scientists to study the composition of ancient climates. This specimen is a 3. 682" fulgurite collected in the Sahara Desert. Originally
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