File #4762: "Rhynie chert. A large irregular block of grey stone polished smooth on one side. The face has numerous small round cavities each surrounded by a ring of darker stone, and irregular cave like cavities full of a cream coloured mineral."

Rhynie chert. A large irregular block of grey stone polished smooth on one side. The face has numerous small round cavities each surrounded by a ring of darker stone, and irregular cave like cavities full of a cream coloured mineral.

Title

Rhynie chert. A large irregular block of grey stone polished smooth on one side. The face has numerous small round cavities each surrounded by a ring of darker stone, and irregular cave like cavities full of a cream coloured mineral.