A beautiful Cleiophane Cluster on a quartz and calcite matrix. Cleiophane is the gemmy or purer version of sphalerite, sought after by collectors for its rarity and beauty. Even in daylight the colour of the crystals on this piece is evident, unlike other specimens which need to be backlit to show the colour. An oresome addition to the metals collection.
Ninth of September Mine, Osikovo Section, Madan, Bulgaria.
8.5cm x 7.2cm x 2.5cm, 98g.
Sphalerite, also known as Blende or Zinc Blende, is the major ore of zinc. When pure (with little or no iron) it forms clear crystals with colours ranging from pale yellow (known as Cleiophane) to orange and red shades (known as Ruby Blende), but as iron content increases it forms dark, opaque metallic crystals (known as Marmatite).