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 MY COLLECTION OF AMERICAN KIMBERLITES, LAMPROITES, AND DIAMONDS

Kelsey Lake Diamond Mine, Colorado
The Kelsey Lake Diamond Mine was the only commercial diamond mine in the US.  Kelsey Lake closed in 1999, but plans are in progress to reopen.  More than 1000 carats of diamonds were removed in 3 years, including two 28 carat cuttable diamonds.
Kelsey Lake Kimberlite
State Line District, Colorado
near the Colorado/Wyoming border
(note the nice serpentinized phenocryst, bottom left)

Kelsey Lake Diamond
Gem-quality 0.60 carat Kelsey diamond showing the typical octahedral crystal habit of diamonds.
Kelsey Lake Diamonds
Two Kelsey diamonds, each about 0.25 carats.  The diamond on the left is an octahedral twin and the diamond on the right shows a rounded octahedral crystal habit.
Kelsey Lake Kimberlite concentrate
Kimberlite is crushed and sorted.  The "heavies" remain in the concentrate which is inspected for diamonds.
Kelsey Lake Kimberlite fine-grained concentrate.  KIMs in the Kelsey Lake Kimberlite include red pyrope garnets, metallic silver illmenite, and zircon.   Check out all the garnets!
Series of five Kelsey diamonds showing the range in crystal forms.  These aren't mine, but I sure wish they were!  Photo courtesy of Eric Miller. Green Mountain Kimberlite
Green Mountain, west of Boulder, Colorado
(not a diamondiferous kimberlite)
Sloan Pipe (#?) Kimberlite
State Line District, Colorado
near the Colorado/Wyoming border
Diamonds have been found in the Sloan Pipes, but not enough to be economically mined.
Sloan Pipe (#?) Kimberlite
Another sample, this one with calcite pheonocrysts.
Chicken Park Kimberlite
State Line District, Colorado
Mantle basalt with olivine fragments
Nathrope, Colorado
(not a kimberlite, but neat olivine phenocrysts)
Indian Guide District Kimberlite (also known as Iron Mountain), Wyoming Indian Guide District Kimberlite (also known as Iron Mountain), Wyoming
A different sample
Pic Coming Soon! Lonetree "Kimberlite", Cedar Mountain, Green River Basin, Wyoming
Silica-rich pipe breccia, perhaps a "hole swipe" (mjwy) as the kimberlite fused with crustal materials on its way up to the surface.
Unnamed Kimberlite
Unknown location, Central Wyoming
Wyomingite, Leucite Hills, Wyoming
Also known as Fitzroyite in Australia where it is the source of the "Argyle Pinks".  Alas, probably no pink diamonds in the US deposit.  Wyomingite is still much rarer than kimberlites or lamproites
Diamond from the Argyle Diamond Mine, Australia
Okay, this little 0.25 carat diamond is actually from Australia.  However, the source rock for the Argyle Diamonds is Fitzroyite, also know as Wyomingite in the United States.
Lake Ellen Kimberlite, NE of Crystal Falls, Michigan
Discovered in 1971, the Lake Ellen kimberlite does contain microdiamonds (< 1mm).  This sample has a nice serpentized olivine.
Weathered Lake Ellen Kimberlite,
NE of Crystal Falls, Michigan
Elliot County Kimberlite
Elliot County, Kentucky
Gates-Adah Dike Kimberlite
Middle Run in Fayette County, PA
Yes, Pennsylvania actually has at least two kimberlites!
Nice pyrope phenocryst in this one!
Gates-Adah Dike Kimberlite
Middle Run in Fayette County, PA
Nice phlogopite phenocryst in this one!
Gates-Adah Dike Kimberlite
Middle Run in Fayette County, PA
Nice calcite phenocryst in this one!
Tanoma Kimberlite
Tanoma Coal Mine, Tanoma
Indiana County, Pennsylvania
Pennsylvania's other kimberlite.
Weathered Tanoma Kimberlite
Tanoma Coal Mine, Tanoma
Indiana County, Pennsylvania
Blue Ball Lamproite
Scott County, Arkansas
Near Crater of Diamonds State Park
Prairie Creek Lamproite
Pike County, Arkansas
Located in Crater of Diamonds State Park where tourists can prospect for diamonds.
Blue Breciated Tuff (Lamproite)
Pike County, Arkansas 
Southern most known pipe, Crater of Diamonds State Park
Blue Tuff (Lamproite)
Pike County, Arkansas 
Southern most known pipe, Crater of Diamonds State Park
Leucite Lamproite
Undisclosed location, Arizona
This lamproite is currently being assayed for diamonds.
Pic Coming Soon! Unnamed Canadian Kimberlite
This kimberlite is unexplored and untested from a location on private land near the Great Slave Lake between Hay River and Providence, NWT, Canada
Jericho Pipe Kimberlite
Near Contwoyto Lake, Canada
Canada's third diamond mine just opened on the Jericho Pipe on August 17, 2006 and is owned by the Tahera Diamond Corp.
Jericho Pipe Kimberlite
Near Contwoyto Lake, Canada
Isn't this garnet just a little stunner?
Jericho Pipe Kimberlite
Near Contwoyto Lake, Canada
Look at the size of this chrome diopside!  A nice ilmenite on the reverse too.
Pic Coming Soon! Jericho Pipe Kimberlite
Near Contwoyto Lake, Canada
All of these samples were hand collected back in the exploration days.  Thanks Rick!
Kimberlite  from Diavek Mine
Near Yellowknife, Canada
KIM's include chrome diopside, phlogopite mica, and pyrope garnets.
(Diavek is the exclusive supplier for Harry Winston Jewelers)
Mir Pipe Kimberlite
Yakutia, Russia (Siberia)
This kimberlite has a real diamond in it.  The bad news - it was probably "assembled".  Anyway, nice phenocrysts in this one too.