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I am a professional merchant with a solid business history and reputationã
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We offer QUALITY mineral specimens deeply discounted. Each item is individually selected by our mineralogist
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Over 10,000 Items
in stock,over 5,000 positive feedbacks,75% of our sales are from Repeat Customers
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All items are in stock, and inspected and warehoused at our location so that we can ensure our customers of quick delivery of quality
merchandise
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glistening
brassy irisated BORNITE specimen
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Hunan
Province,China
Approximately: 53mm x 32mm
x 31mm
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Bornite is an
important copper ore mineral. It ranks up there with many
of the other copper ores such as chalcocite, chalcopyrite,
covellite, digenite, cuprite and tetrahedrite. As a
mineral specimen, bornite is usually lacking. Good
crystals are rare and thus bornite is commonly known as
simply a massive mineral ore.
It does however get used in the mineral trade as a
curiosity called "peacock ore". A favorite among
children, the bornite chunks sold as peacock ore or
alternatively peacock copper have a rich bouquet of
colors. The colors are from an iridescent tarnish that
forms on bornite upon exposure to air. The tarnish is made
of assorted copper oxides or hydroxides that form a mere
atoms thin layer over the bornite. The thickness of the
layers is close to the wavelength of light. When light
waves bounce between the bornite surface and the top of
the tarnish layer they will leave with the wavelengths of
various colors. This effect is the same as the rainbow
effect that occurs with oil on water. In the case of
bornite, the tarnish will have a purplish, violet or blue
color. Because bornite is often intergrown with
chalcopyrite which tarnishes to more greens and yellows,
the peacock ore may have many colors ranging from purple
to blue to green to yellow.
Bornite's crystals, if found, are usually distorted cubes
with curved faces. Even rarer are the distorted
octahedrons and dodecahedrons. These are isometric
crystals. However, bornite's structure at normal
temperatures is not isometric. Bornite is only isometric
at temperatures above 228 degrees celsius and it was above
this temperature that the crystals formed. As bornite
cooled it structurally altered to possibly a tetragonal
structure but outwardly it retained the isometric forms.
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ãPayment Options
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| We accept all forms of PAYPAL,
Bank Transfer.Please wait to be invoiced before paying if you've won more than one item, or you wish to continue shopping. Combined shippings savings are applicable with one lump sum payment only. Payment is expected within seven days of the first purchase. If you are a regular customer and are reliable to pay your Ebay wins,20 days is fine by me.
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Warranty & Return
Policy
Product is warrantied to be as described and
pictured.Order with complete confidence. Examine your product and if your item has arrived damaged, is not the correct item, contact us immediately for return instructions and we will make it right with a full refund or replacement!
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Delivery Options
For customers living anywhere in the U.S.,the shipping and handling charge for this item is
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charge
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shipping
method
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periods
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$0.00
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Global Airmail
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10-55days
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insurence is required each
$2
For destinations outside the USA please
send us an e-mail.
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Open
box policy
If you win an item and wish to continue shopping/bidding, contact me and I'll hold off invoicing for up to
7 days to allow you to fill a box and maximize savings on shipping. When you're done shopping just let me know and I'll send out a new
invoice
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shipping
method
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Net
weight(g) of all items in 7 days
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shipping
charge
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Global
Airmail
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0-50
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$6.98
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51-100
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$7.98
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101-150
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10
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151-200
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12
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201-250
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14
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251-300
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16
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301-350
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18
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351-400
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20
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401-450
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22
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451-500
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24
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501-600
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26
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601-700
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28
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701-800
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30
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801-900
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32
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901-1000
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34
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over
1000
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$4 for
every additional 100g
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If your purchases net weight more
than 2kg in 1 week,I would like send them in one parcel by USPS(Free
upgrade from Airmail)
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