Buergerite Tourmaline with Topaz and Hyalite Opal Mexquitic, San Luis Potosí, Mexico 10cm x 8.43cm x 3.7cm Ex. A. J. Beres Collection No. A-204

Description/Interesting Notes: A magnificent example of this rare tourmaline species from the only and type locality in Mexico!!! This specimen consists of a hard ryholite matrix that hosts an impressive showing of sharp, lustrous, dark brown crystals of buergerite in association with numerous tiny crystals of topaz as well as some colorless hyalite opal!!! While buergerite crystals are rare, matrix examples are exceedingly more so!!! Usually the buergerite crystals were found in very fragile, unstable matrix that tended to crumble apart!!! This matrix is incredibly hard and is surprisingly rich with tiny topaz crystals (as well as some tiny, doubly terminated quartz crystals with essentially no prism faces!)!!! This is the first time I have seen buergerite crystals paired with topaz - as well as hyalite opal!!! The buergerite crystals are sharp and prominently perched on the matrix!!! The crystals are highly lustrous and exhibit a dark brown color with the characterisitic slightly tiger's-eye like internal play of light!!! While there are some complexly formed crystals present, the crystals are all complete and undamaged!!! The crystals range in size to over 1cm!!! The topaz crystals range in size to over 4mm!!! The hyalite opal is water-clear and highly lustrous - it is difficult to see in the pics however it fluoresces bright yellow-green under UV and you can see it very well in those pictures!!! These old type locality specimens came from a single group of specimens recovered by a single miner and brought to Tucson in the 1960's - unfortunately the miner died before revealing the exact location to anyone and it remains lost to this day!!! This is simply an amazing example of this rare "lost locality" tourmaline species indeed!!! This specimen is from the collection of A.J. Beres as well!!! The pics hardly do it justice!!! Good luck and be sure to check out my other exciting mineral auctions on ebay!!! STAY TUNED!!! MORE AUCTIONS WILL BE ADDED SATURDAY NIGHT FOR A SPECIAL 5-DAY AUCTION, ENDING THURSDAY OCTOBER 7th!!!

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