We are sad to report that the Rogerley Mine is officially closed. Located in the village of Frosterley in County Durham, England, the mine was operated commercially for mineral specimens in the 1970s, and then was run by from 1999 through August, 2016. The mine workings followed an adit extending northward along the Greenbank vein at the High Flats horizon of the Great Limestone. Colorful specimens of green fluorite crystals, some associated with galena, were recovered from discontinuous mineralized flats on both the east and west sides of the vein.

The Capillitas Mine is the believed to be the world's largest mass of rhodochrosite - famous for its unique formation, occurring as stalactites and stalagmites. Rhodochrosite is a manganese carbonate mineral with the chemical composition MnCO3. The mine is located in the Andalgalá Department, Capillitas Province, in northwestern Argentina.

Mined since Incan times, the polymetallic sulphide veins at the Capillitas Mine were worked in the 17th century for silver, and later for lead and zinc. Today, sulphides extraction is no longer economical, but the mine is still being worked for and lapidary material for specimens and carving, producing 100-200 tons of material a year. The banded rhodochrosite is often sliced and polished into slabs for collectors.

  • Created By : 20-Apr-2017
  • Write By: tmmadmin
  • Published In: ROOT
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Chalcopyrite is a brassy yellow mineral with the chemical composition CuFeS2, or copper iron sulfide. It is found in most sulfide mineral deposits around the world. Chalcopyrite loses its surface metallic luster and brass-yellow color when it weathers, changing to a dull, gray-green color. When acids are present, the color can become brilliantly iridescent purple, violet, blue or green. Chalcopyrite is most easily recognized by its brassy yellow color, metallic luster, and high specific gravity, which give it an appearance similar to pyrite and gold. Unlike these minerals, chalcopyrite is brittle and has a unique greenish-gray streak, and unlike pyrite, is easily scratched with a nail.

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  • Created By : 18-Mar-2017
  • Write By: tmmadmin
  • Published In: Mineral Show Reports
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by Eric Greene

We have been going to Tucson for almost 20 years now, and I will remember this year's show for its cool temperatures and hot prices. We arrived in Tucson January 24, departing after a harrowing drive through a sleet and ice storm to get to the airport for a 6:30 AM flight. We arrived in Tucson to find cool temperatures in the 40s and low 50s, with frost every morning the first week we were there. Though the sun shone most of the time, it struggled to warm up to the 60s and didn't hit 70 until our last few days in town. Uncharacteristically, I never put on a pair of shorts, and didn't even wear a short-sleeved shirt until our last 2 days.

But enough about the weather, and on to the mineral prices. I admit that after last year's show I was expecting that specimen prices would come tumbling down this year for the first time in memory, after the run of steady increases that have been the hallmark of mineral prices for decades. In this I was largely disappointed. Fortunately, there were signs of downward creep if you looked hard and long enough – and I did look hard and long to find some great bargains!

  • Created By : 16-Mar-2017
  • Write By: tmmadmin
  • Published In: Mineral Show Reports
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I still can barely believe how many new, colorful, and exciting specimens we brought home from the Tucson Show this year; this made picking out my favorites really difficult. Here are the new specimens which I love that I think are significant and highly aesthetic. They will give you an idea of what we found. If you are interested in any of these specimens, just click on the "for sale" links to go to the pages in our website where you will find that piece for sale.