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3.4" Shiny Gold & Black Pyrite Concretion Oval With Stripes China For Sale For Sale

3.4

Untitled Document

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3.4" Shiny Gold & Black PYRITE CONCRETION
Oval with Stripes - China
for sale


$75.00


Size:
3.4" x 3.1" x 2.8"


Shipping weight:
2.1 pounds


Condition:
Excellent
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Here is a very attractive pyrite concretion from China with alternating gold and black stripes of shiny pyrite and dark gray shale. The piece has a shape like a ball, with a slightly cone-shaped, flattened bottom. There is no damage.

Click on the photos for enlarged view



3.4" cabinet size



Crystallized gold stripes



Great contrast between golden pyrite and dark grey shale




All of our specimens come with a custom label with accurate locality information Click arrow to see a video of this fine mineral specimen


Locality
Information about crystals/mineral specimens from this location


At the Tucson Gem, Rock & Mineral Show this year, I several of these beautiful, roughly spherical dark grey SHALE concretions with PYRITE (also known as fool's gold) formed in rings over the surface (and presumably within?). This highly aesthetic specimen comes from the Dongchuan District, Kunming Prefecture, Yunnan Province, China.


Mineralogy
Facts about gems, rocks and minerals


A concretion is a volume of sedimentary rock in which a mineral cement fills the porosity (i.e. the spaces between the sediment grains). Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin con meaning 'together' and crescere meaning 'to grow'. Concretions form within layers of sedimentary strata that have already been deposited. They usually form early in the burial history of the sediment, before the rest of the sediment is hardened into rock. This concretionary cement often makes the concretion harder and more resistant to weathering than the host stratum.

Pyrite is the classic "Fool's Gold". There are other shiny brassy yellow minerals, but pyrite is by far the most common and the most often mistaken for gold. Whether it is the golden look or something else, pyrite is a favorite among rock collectors. It can have a beautiful luster and interesting crystals. It is so common in the earth's crust that it is found in almost every possible environment, hence it has a vast number of forms and varieties.
Bravoite is the name given to a nickel-rich iron sulfide. It is closely related to pyrite but contains up to 20% nickel. Some mineral books treat it as a variety of pyrite.

Pyrite is a polymorph of marcasite, which means that it has the same chemistry, FeS2, as marcasite; but a different structure and therefore different symmetry and crystal shapes. Pyrite is difficult to distinguish from marcasite when a lack of clear indicators exists.

Pyrite's structure is analogous to galena's structure with a formula of PbS. Galena though has a higher symmetry. The difference between the two structures is that the single sulfur of galena is replaced by a pair of sulfurs in pyrite. The sulfur pair are covalently bonded together in essentially an elemental bond. This pair disrupts the four fold symmetry that a single atom of sulfur would have preserved and thus gives pyrite a lower symmetry than galena.

Although pyrite is common and contains a high percentage of iron, it has never been used as a significant source of iron. Iron oxides such as hematite and magnetite, are the primary iron ores. Pyrite is not as ecomonical as these ores possibly due to their tendency to form larger concentrations of more easily mined material. Pyrite would be a potential source of iron if these ores should become scarce.

Pyrite has been mined for its sulfur content though. During WWII, sulfur was in demand as a strategic chemical and North American native sulfur mines were drying up. A sulfide deposit near Ducktown Tenn. was found to be able to mine pyrite and other sulfides such as pyrrhotite and pentlandite and produce the needed sulfur as well as iron and other metals. The sulfur was used in the production of sulfuric acid, an important chemical for industrial purposes. Now most sulfur production comes from H2S gas recovered from natural gas wells.


Metaphysics
Information about crystal, gem and mineral metaphysics and healing


People interested in metaphysics and crystal healing tell us that pyrite is one of the most protective stones in use today. It can shield one from many types of negative energy. It is also an excellent healing stone, and as a representative of the Sun's golden energy it can help one to see through facades.


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Every specimen comes with our label, giving the full mineral name plus accurate locality information


About Treasure Mountain Mining

Fine Mineral Specimens for sale

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We are an award-winning, internationally known internet mineral dealer with an impeccable reputation for high quality mineral specimens, fast, friendly service, and a 100% satisfaction guarantee on all sales. Our mission is to bring joy into the lives of our mineral collecting customers by helping them build high-quality collections of gemstones, crystals, minerals and rocks. To do this, we offer a wide variety of the finest crystals including loose gemstones for sale, large crystal clusters for sale, pyrite nuggets for sale, aquamarine gemstones for sale, and quartz crystals for sale. You can come to us to buy clear quartz crystals, black tourmaline rough, phantom quartz crystals, raw amethyst crystals, amethyst quartz crystal geodes, gemstones for jewelry, and mineral specimens and crystals. Not only are we the best place to buy gemstones, we also provide gem and mineral information, facts about rocks and minerals, we help our customers identify rocks and minerals, and we report on the major rock and mineral shows. Also, you can read about us on Bob's Rock Shop, Mindat, and many other fine websites.


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3.4" Shiny Gold & Black Pyrite Concretion Oval With Stripes China For Sale:
$75




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