Bornite
SpiritRock Shop
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Item# A-BOR06172151
Bornite
from Mexico

$3
0.00
This specimen from Chihuahua, Mexico was
collected in 2001
it weighs 11.3 oz or 0.7 lbs (320g)
and measures 3.5 x 2.9 x 1.7 inches (8.9 x 7.3 x 4.3cm)
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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 inter
grown 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 is an important copper ore mineral and occurs widely in porphyry copper deposits along with the more common
chalcopyrite. Chalcopyrite and bornite are both typically replaced by chalcocite and covellite in the supergene
enrichment zone of copper deposits. Bornite is also found as disseminations in mafic igneous rocks, in contact
metamorphic skarn deposits, in pegmatites and in sedimentary cupriferous shales. It is important for its copper content
of about 63 percent by mass and is found in Arizona, Butte, Montana, and Mexico. It's existence has been reported
since 1725, but in 1845 it was named for Austrian mineralogist Ignaz Edler Von Born (1742–1791).
Item# B-BOR06170590
C
lassic Bornite
from B
utte, Montana

$25.00
This estate sale specimen is from a 1950's Butte, Montana collection
weighs 6.2 oz or 0.39 lb (178g) and measures 3.3 x 2.7 x 1.3 inches (8.4 x 6.9 x 3.4cm)
Museum Specimens
Beautiful Iridescent Bornite
from The Willard Elsing Collection
Locale: Bisbee Arizona
Discover the wonder of God's natural art at the area's largest exhibit of priceless minerals and natural crystal
formations. Willard Elsing opened a rock and mineral shop on Route 66 near Joplin in the 1920s, and over a
lifetime, his fascination for mineral and rock art grew into an unprecedented collection.
Since 2001, his collection has been on display at Oral Roberts University for all to enjoy.
Elsing Museum
7777 S. Lewis Ave.
ORU Learning Resource Center
Tulsa, OK 74171
(918) 495-6262                                                                   
elsing.oru.edu
Willard Elsing
(1911-2004)

Willard L. Elsing, consummate rockhound and founder of the Elsing Museum in Tulsa, was born in Kansas on
July 22, 1911, and died at the age of 93 on October 17, 2004. His father Walter had emigrated to America from
Germany in 1890 and established a cleaning business in Pittsburg, Kansas in the 1920's. As a young boy
Willard became fascinated with all sorts of local collectibles, including arrowheads, ethnic artifacts, rocks and
(especially) minerals. In the 1930's he left home and opened a rock and mineral shop on Route 66 near the
lead-mining center of Joplin, Missouri. Miners from throughout the Tri-State District brought him specimens
which he bought for the shop, keeping many of the more interesting examples for his own growing collection. It
was a great sadness to him when the Tri-State mines finally closed down.

Elsing favored crystal collecting above all, and was an aesthetic collector rather than a scientific one. He
preferred to buy many of his specimens at minerals shows rather than obtain them by field-collecting. He
recommended comparing prices carefully to avoid being overcharged, and advised, "When you find a dealer
who will take a little time to help you, stick with him." He always made a habit of reinvesting profits from specimen
sales in new specimens for his collection, and he recommended joining a local club to meet other collectors and
potential buyers. Elsing always kept the original labels showing what he had paid for specimens, and he
endeavored never to sell anything at less than its inflation-adjusted purchase price. In his 90's, he could still
quote the purchase price of specimens he had bought in the 1930's.

In the early 1970's Elsing made the acquaintance of Evelyn Roberts at a seminar being held at Oral Roberts
University, and eventually he agreed to transfer much of his huge collection to the Learning Resource Center of
Oral Roberts University in the University Village retirement center. In 2001 the collection, still referred to as the
Elsing Museum, was moved onto the campus of the university, where it can be seen today. Proudly dubbed
"God's natural art museum" (Oral Roberts University is a religious institution), the museum exhibits over 3,000
specimens including a 2,900-carat Australian opal, slabs of scenic agate, Oriental jade work, Native American
rarities, fossils, mineral art, and a great many attractive and interesting crystallized mineral specimens. In
response to increasing visits by school groups, some new educational exhibits are planned for the future,
including an indoor man-made cave. More information about the Elsing Museum at Oral Roberts University is
available on the museum's website: http://elsing.oru.edu.

Reference:
WILSON, W.E. (2005) Died, Willard L. Ellsing, 93. Mineralogical Record, 36, 140-141.
We were able to procure a few specimens from the famous Willard Elsing Collection. We obtained
these specimens from a reputable rock and mineral wholesaler out of Keokuk Iowa who was
selling off some of the collection pieces from the museum that would not be used in the museum
collection. This is a once in a lifetime chance to have a piece of history. You will see Mr Elsing
holding a sample on the Rockhound magazine cover. It is on a carved green foam display base.
You will see our first and largest Bornite specimen on an identical green foam display with an
original ID tag attached . His collecting period ran many decades starting in the 1920's.
Item# BOR05091431

Iridescent Bornite
from The Willard Elsing
Collection (627g)

$79.00
Large Old Stock Iridescent Bornite Display on
green foam base with old ID tag. This piece is from the
Bisbee, Arizona area. This specimen from the Willard
Elsing collection is a real treasure!
Based upon
information we obtained from historical Bisbee data, we
believe these specimens were collected in the late
1940's to early 1950's. Foam and specimen will be
shipped and can be displayed as shown in 1st photo.

weighs 1.38 lbs (627g)
and measures 5 x 2.9 x 1.8 inches (127 x 74 x 46mm)
Item# 3BOR06174341
Iridescent Bornite
from The Willard Elsing
Collection (200g)

$5
7.00
Old Stock Iridescent Bornite Display. This piece is from the Bisbee, Arizona area.
This specimen from the Willard Elsing collection is a real treasure!
It weighs
7 oz or 0.44 lbs (200g) and measures 3.5 x 1.6 x 1.3 inches(89 x 42 x 33mm)
Item# 2BOR06173341
Iridescent Bornite
from The Willard Elsing
Collection (1
46g)

$5
9.00
Old Stock Iridescent Bornite Display. This piece is from the Bisbee, Arizona area.
This specimen from the Willard Elsing collection is a real treasure!
It weighs
5.1 oz or 0.32 lbs (146g) and measures 2.9 x 1.6 x 1.5 inches (7.5 x 4.2 x 4 cm)
Tag reads...Bornite or Peacock Copper Ariz
The old foam has
disintegrated.
The specimen is
loose with foam layer
glued onto the
bottom of the
specimen.
Own a true piece of
History!
Item# 4BOR06173341
Iridescent Bornite
from The Willard Elsing
Collection (2
30g)

$59.00
Old Stock Iridescent Bornite Display. This piece is from the Bisbee, Arizona area.
This specimen from the Willard Elsing collection is a real treasure!
It weighs
8.1 oz or 0.5 lbs (230g) and measures 3.6 x 2.3 x 1.3 inches (9.2 x 6 x 3.3 cm)
Item# 5BOR06173341
Iridescent Bornite
from The Willard Elsing
Collection (2
27g)

$5
6.00
Old Stock Iridescent Bornite Display. This piece is from the Bisbee, Arizona area.
This specimen from the Willard Elsing collection is a real treasure!
It weighs 7
.9 oz or 0.49 lbs (227g) and measures 2.5 x 1.8 x 1.5 inches (6.4 x 4.5 x 3.8 cm)
These are the most
pure Bornite specimens
we have ever seen