Figure 4-2. Microcrystalline calcite in the outer portion of a stalactite. Note the diffuse roughly circular structures of unknown origin.
   Photomicrograph was taken in plane-polarized light; field of view is 2.2 mm wide. Haylaa Cave, Somalia, Stalactite HL4; thin section HL4A; sample collected by Dr. George A. Brook.
  Speleothem Image
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