3.4" Shiny Gold & Black Pyrite Concretion Oval With Stripes China For Sale For Sale
Shiny Gold & Black PYRITE CONCRETION
Oval with Stripes - China
x 3.1" x 2.8"
what this means
do we do to
ensure color accuracy in
How do we pack
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2" Peg Stand
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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.
on the photos for enlarged view
3.4" cabinet size
Crystallized gold stripes
contrast between golden pyrite and dark grey shale
of our specimens come with a custom label with accurate locality information
arrow to see a video of this fine mineral specimen
about crystals/mineral specimens from this location
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.
about gems, rocks and minerals
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.
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.
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.
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.
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.
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.
about crystal, gem and mineral metaphysics and healing
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.
finds a keeper!
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specimen comes with our label, giving the full mineral name plus accurate
Treasure Mountain Mining
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3.4" Shiny Gold & Black Pyrite Concretion Oval With Stripes China For Sale: $75