John Betts - Fine Minerals, dealer of fine minerals and specimens for mineral collectors.


Go To New Mineral Listings Added January 24

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November 12-13, 2016, Autumn New York Gem & Mineral Show

 

 

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Mineral of the Week

Mineral of the Week
#71910, Montebrasite, Telírio Mine, Linopolis, Brazil (c) $950

 

   


 News and Comments

There is new information about the pyrite crystals from Milpillas Mine in Mexico. They were described here and on other sites as coated with bornite. But recent tests from two universities cannot narrow the coating down to bornite, After inquiring to my sources, it appears that even the first tests could only narrow it down to several minerals. But a wholesale dealer decided to sell them as coated with bornite.

It turns out that bornite is not the best guess for the mineral that coated the pyrite crystals.

The likely candidates are Chalcocite (Cu2S), Djurleite (Cu31S16 ) or possibly (but not likely) Bornite (Cu5FeS4 ). You will note that Chalcocite and Djurleite do not contain iron (Fe). The first tests detected Fe, but it is now assumed the Fe was the result of the underlying pyrite. But bornite cannot be ruled out without more advanced tests with better samples.

If the wholesale dealer was guessing, why did he select bornite?

The gray-metallic color of the coating is typical of chalcocite, not bornite. And there are similar chalcocite-coated pyrite crystals from Chino, NM. These were sold as "ducktownite" and later identified as chalcocite-coated pyrite.

As a result of this new information I have relabeled my specimens as "Pyrite with Chalcocite-Djurleite-Bornite coating."

 John H. Betts, 1/24/2017

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Customer Comments:

"I purchased a fine Illinois Fluorite with Calcite specimen. Absolutely amazing specimen. The photos provided on the site did not do it justice! All labels were included which added something special to this particular piece as it was part of Joe Dorris' collection. It made a fine addition to my own collection." L. Osborne

"Thanks very much; it arrived today. The wavellite specimen is great, and your packaging is outstanding! Cheers, Don"

"I recently purchased a piece of Tanzanite from you. I'm not a jeweler, I'm a mineral and element collector. I purchased the cheapest piece you had as my funds are limited but I am so far beyond satisfied. My collection, concerning gems is still missing rough diamond, topaz, and ruby but, when my funds are sufficient I will purchase from you again. Your honesty in describing and providing images is/was more than impressive. I can and will recommend you to any and all collectors! " Joshua Covin.

"The mineral arrived Saturday. The pictures on your webpage accurately and fully described the mineral specimen. This was the first time I purchased a mineral on line and I am not disappointed. Thank you." Rich G.

"Recently I made a purchase from this site. I am very impressed with the customer service. The process of purchasing a mineral and having it posted to Australia was quick and easy. It was packaged well and I am completely satisfied. I will be purchasing from John again soon." Jeremy Williams

"Minerals got here this morning. The real stones are so much more beautiful than the pictures and the pictures were fantastic." Rick & Bonnie R.

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Pledge to My Customers:

Customer satisfaction is my primary goal. I pledge:

  1. New minerals will be added to this site every week.
  2. All minerals offered will be naturally crystallized specimens - no fakes, no dyes,  no irradiation, no crystals glued on matrix.
  3. Only the exact item pictured on the site will be shipped - no substitutes.
  4. Photographs will accurately represent each item - no exaggeration, enhancement or retouching flaws.
  5. Mineral species and localities will be accurately listed on labels with each specimen.
  6. All items will be shipped via US Postal Service, usually the next business day after the order is finalized.
  7. Each mineral will be individually wrapped and carefully packaged to prevent damage during shipping.
  8. All historic labeling, if available, will be included with each mineral.
  9. Returns are gladly accepted. No questions asked, no explanation necessary.
  10. All customer information will be kept confidential and never shared or sold.
  11. I will continue to freely share my knowledge with others and contribute to the study and appreciation of minerals.
  12. All mineral specimens have a lifetime guarantee: if the mineral specimen is ever tested, and I incorrectly identified the mineral species, I will refund the cost of the original purchase & shipping, the cost return shipping, and the cost of the test.

 John H. Betts, owner
Mineral dealer since 1989, mineral collectors since 1967

 

 

  

 

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John Betts - Fine Minerals, New York, NY
a division of allminerals.com, dealer of Fine Minerals and Natural Crystal Clusters since 1989.

Internet sales only - No showroom

 

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