Fluoro-richterite   (NOT fluorichterite or any other misspelling)      Wilberforce, Ontario, Canada.  Ex. Michael Walter collection.  Collected by Michael Walter in 1990's.  Figured Specimen, Rock and Gem Magazine, October 2008, p. 72-75.     4.8 x 4 x 2.5 cm strongly twinned crystal.  Contacts on one side and a small part of the back otherwise very smooth, lustrous, and in outstanding condition.  The twin plane is amazing!  The photos will tell the story.  Twins are not uncommon with this material but twins like this are very, very rare.  Displays great.  $450