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Listed here are mostly thefts from institutions. More general announcements of stolen mineral specimens can be found on the following websites:
     The Mineralogical Record:

Fallbrook Gem & Mineral Museum
San Diego County Tourmaline
September 10, 2017

Update - October 24, 2017

Colorado School of Mines Geology Museum:
Rhodocrosite on fluorite from Bonanza, Colorado

American Museum of Natural History:
Missing tourmaline crystal from Haddam, Connecticut

Major theft from Desmond Sacco collection: December 2014

University of Arizona Mineral Museum:
Kalgoorlie Gold Nugget, May 30, 2014

Museum of Mineralogy in Baia Mare: January 2014

Johannesburg Geology Museum: July 2013

Santa Barbara Museum of Natural History:
Benitoite and gold specimens

On December 10, 2011, specimens of benitoite and gold were stolen in an early-morning break-in.

Sterling Hill Mining Museum: Gold Specimens

Geology Museum - Mott Community College, Flint, Michigan
On March 1, 2010, several display cases were broken into and 52 specimens were stolen (LIST). Walter Kellog appraised the collection in 2006 and his notes are included in the list.
All specimens had a label attached to them. This was a small round piece of paper from a hole punch with the ID# written on it. The labels were affixed with either glue or lacquered over.
Contact: Museum Director Sheila Swyrtek

Mineralogical Museum, University of Munster: Samsonite
Use the link above to access a report in German from Mineralien Welt regarding the theft of several specimens of samsonite on Sunday, March 12, 2006, from the Mineralogical Museum of the University of Munster.

National Museum of Natural History, Malta: Moon Rock

The Natural History Museum, London: Kongsberg Silver

Museon (The Hague, Netherlands): Diamonds
Thieves make off with diamonds worth millions (AP news story)
Historic BMNH specimen among those stolen (report from Alan Hart)

California Academy of Sciences: Star ruby ring
Platinum ring set with 6 straight baguette diamonds weighing a total of approx .60 ct., 2 triangle-cut diamonds weighing about 0.10 ct., and 20 full cut diamonds weighing about 0.20 ct.  The center stone is an oval cabochon star ruby 12.5 x 8.8 x 8.0 mm, weighing about 8.8 cts.  The ruby is pinkish red with several surface fractures & heavily included.  The star is well centered but not distinct.
Contact: Jean F. DeMouthe

Colby College: Tourmaline specimens 

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