McGregor Lake, Val-des-Monts, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada
Dark needles of "riebeckite". Find, collection and photo Erik Vercammen
Zimbabwe
Riebeckite var. Crocidolite Wavy blue Riebeckite var. Crocidolite fibers 3 cm. long in silica, giving the specimen a chatoyant luster. The specimen has been sawn and polished to show the tiger eye effect. Cataloged as Tiger Eye from Rhodesia, now Zimbabwe.
© Terry Burtzlaff
I inherited this specimen from Domenic Olivieri of Wakefield, Quebec in 2018.
© Jeffrey de Fourestier
Zagi Mountain, Hameed Abad Kafoor Dheri, Peshawar District, Khyber Pakhtunkhwa Province, Pakistan
Two very sharp, dark green-black terminated Riebeckite crystals are on matrix, associated with micro Quartz crystals. The largest Riebeckite crystal is 1.6 X 1.3 cm across. Personal collection of Sharon Cisneros.
© Eugene & Sharon Cisneros
Alto Chapare mining district, Chapare Province, Cochabamba, Bolivia
Hairy Magnesioriebeckite from the type locality. Field of View is 4.5 cm
© AsbestosMinerals.com
Rosa No. 1 trench, Mount Rosa, El Paso County, Colorado, USA
Black riebeckite prisms in syenitic granite. It is curious that they show no preferred direction. Riebeckite is a primary constituent of the Mt. Rosa Granite. Collected Feb. 2009 by Dean Allum.
Transvaal, South Africa
RRUFF Project Specimen ID: R060028 Locality: Transvaal, South Africa. Source: University of Arizona Mineral Museum 9374. Black to blue fibrous, known as blue asbestos.
© Rruff Project
St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA
Crystal is 5x3x2cm. This quasi-hexogonal riebeckite prism has a nice termination which luckily came out of the quartz intact. Collect August 2013 by Dean Allum.
© D. Allum
Franklin, Sussex County, New Jersey, USA
Large specimen of gray-blue magnesioriebeckite (10 cm across, approximately) on display in the Franklin Mineral Museum. P. Cristofono photo.
© 2007 Peter Cristofono
Buckwheat pit, Franklin Mine, Franklin, Sussex County, New Jersey, USA
Blue fibrous magnesioriebeckite. Field of view is about 7 mm across. Collected on the Buckwheat dump in 2007. P. Cristofono specimen and photo.
Blackburn Circle locality, Gloucester, Essex County, Massachusetts, USA
P. Cristofono specimen and photo, field collected 2009.
© 2009 Peter Cristofono
Kryvorizkyi Iron Ore Basin, Ukraine
Andrey Gorshkov collection and photo.
© Andrey Gorshkov
Polished surface Collection and photo Roberto Bosi
© Roberto Bosi
Alp Mos, Ausserferrera, Ferrera, Viamala Region, Grisons, Switzerland
Another shot of the Mg-rich riebeckite crystal group Photo uploaded by Bruno Marello
© Marello Minerali
Eureka Tunnel, St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA
Large black riebeckite crystals in a quartz and feldspar matrix. This nice sized specimen was picked up off the abandoned haul road on the way in to the Eureka Tunnel. Currently in the Polhemus collection, catalog # POL-MIN-2020-0228.
© Dan Polhemus 2020
Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
Liberty Bell mountain talus slope. Blue fibrous “crocidolite” with Chamosite. Field of view 8 mm. Robert Meyer specimen and photo.
© 2004 Robert O. Meyer
Northern Cape, South Africa
Long fibrous Crocidolite asbestos from the Northern Cape Province, South Africa. This specimen is kept in an enclosed case, as Asbestos has been proven to cause problems due to inhalation. Specimen is roughly 80 x 70 x 50 mm.
Mount Malosa, Zomba, Southern Region, Malawi
RRUFF Project Specimen ID: R050082 Locality: Mt. Malosa, Zomba, Chilwa, Alkaline Area, Malawi Source: Rock Currier Black elongated prisms
Dales Gorge, Wittenoom, Ashburton Shire, Western Australia, Australia
Crocidolite collected from roadside in Dale's Gorge in Nov 1970. FOV is 5cm. Fibres separating from massive crocidolite.
© Tim Colman
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV ~ 1.1 cm. Found 2000. So called "riebeckite" - but not analyzed. This "naturally curly" variety from marble xenolith is less common than the "straight haired" type found in hornfels. For an example of the "straight haired" variety see [https://www.mindat.org/photo-185829.html].
Wittenoom, Ashburton Shire, Western Australia, Australia
Bluish fibres of crocidolite in veins and lenses of varying length.
© Judy Rowe
8x8x4cm. xls up to 2cm across. Little Quartz crystals, partly as zepter are also present. Material and photo Gruell
© http://www.mineralienkluft.at
Pomfret Mine, Pomfret, Kagisano-Molopo Local Municipality, Dr Ruth Segomotsi Mompati District Municipality, North West, South Africa
"Cone" structures formed in crocidolite asbestos from the Pomfret mine. These structures are fairly common and form due to pressure, the same process that produces stylolites. Johannesburg Geological Museum specimen.
Numerous fine black Riebeckite needles included within a Quartz crystal. Overall size is 7.3 x 5 cm.
© Nik Nikiforou
Alter Pedroso, Alter do Chão, Alter do Chão, Portalegre, Portugal
Massive specimen. Rui Nunes' collection and photo, December 2009.
© Rui Nunes 2009
80 x 55 x 18 mm.
© 2008 Joseph A. Freilich, LLC. All Rights Reserved
Valais, Switzerland
Magnesioriebeckite crystals on Quartz. Photo and Collection Christophe Boutry.
© Christophe Boutry
5.5 x 4 x 2.5 cm. A superb group of lustrous black crystals of this very rare species, to 3.3 cm, perched on a granite matrix. A small reddish-brown Bastnasite crystal is nestled amidst the group. Although Riebeckite is a common black rock-forming mineral at the deposit, it is very uncommon as crystallized specimens. According to Dr. Peter ...
© Rob Lavinsky & irocks.com
Tilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
Fibrous riebeckite on calcite.
© 2020 Harold Moritz
Fibres length: 5 cm. Currently in J. Parafiniuk collection.
© Jakub Witkowski
Prieska, Siyathemba Local Municipality, Pixley ka Seme District Municipality, Northern Cape, South Africa
7.6 x 3.9 x 2.8 cm. Crocidolite is a form of riebeckite [Na2][Fe2+3Fe3+][(OH)2|Si8O22], which is easily apparent when you see the specimens densely-packed hair-like fibers. This variety is often called "blue asbestos" due to its deep blue-black color. This is an old-time piece from mining in South Africa. Fortunately, it was not used much ...
Fort Point, San Francisco, San Francisco County, California, USA
Prismatic crystals, to almost 1.0 cm. scattered in matrix. S192-26 Specimen courtesy of Excalibur Mineral Company.
© 2007, JGW
Pollone, Biella Province, Piedmont, Italy
RRUFF Project Specimen ID: R060037 Locality: Pollone, Piedmont, Italy Source: University of Arizona Mineral Museum 4236 Black bladed single crystals embedded in a white matrix of calcite
Redekammen, Tunulliarfik Fjord, Ilímaussaq complex, Kujalleq, Greenland
© Stenbutikken.dk
Granite Railway Quarry, Quincy, Norfolk County, Massachusetts, USA
Matted blue crocidolite on granite. Specimen size: 2.5 cm x 3 cm. P. Cristofono specimen and photo. Field collected 1988.
© 2004 Peter Cristofono
Wittenoom Gorge Mine, Wittenoom Gorge, Wittenoom, Ashburton Shire, Western Australia, Australia
Blue grey band of asbestiform Riebeckite (Crocidolite). Personal collection. 30mm x 20mm x 10mm
© Keith
Grabenbach area, Golling an der Salzach, Hallein District, Salzburg, Austria
Magnesioriebeckite inclusions in quartz. Field of view 3 cm - Photo & collection M.Mader
© Manfred Mader
Crystals up to 5cm - Overall size 14x8x8cm - Self-collected in March of 2003
© Photo & Collection of Martins da Pedra
Size: 9 X 3 cm Collection and photo: M Arliguie
© M Arliguie
Overall size 9 x 4,5 x 2,5 cm - Field of view 4 cm - Photo by Stefanie Menig
© Stefanie Menig
Crocidolite. Photo and Collection; Jorge M. Alves.
© Jorge Moreira Alves
This example of the cone-shaped stromatolite Conophyton has a basal layer of crocidolite fibers discolored by hematite. I bought it for the Conophyton, and the unique crocidolite habit that might be called "tiger's eye" by many rock collectors, was a bonus. Specimen 7.9 cm left to right. Collection and photograph Norman King.
© Norman King
Schlossberg quarry, Schlossberg, Gloggnitz, Neunkirchen District, Lower Austria, Austria
FOV 1,6 mm; Chris Auer photo and collection, self collected in 2007
© AC
A curious example of Crocidolite (also known as "Blue Asbestos") from South Africa, this specimen consists of a sharp, blocky group of Crocidolite crystals in minor association with Pyrite. The crystal is dark blue and exhibits a sharp "cat's eye" effect. Specimen size is 5.2cm x 3.2cm x 2.9cm.
© Jasun McAvoy & mineralman.com
Eureka Shaft, Cheyenne Mining District, El Paso County, Colorado, USA
Dimensions 69mm x 32mm x 75mm. Aligned Riebeckite needles penetrating quartz. Collected June 2007 by Dean Allum
Andakatany Deposit, Andakatany, Manandriana District, Amoron'i Mania, Madagascar
Size: 5 x 3 cm Collection and photo: Arliguie M
© Arliguie M
Filadelfia mine, Cristalmayu valley, Cristalmayu, Cristalmayu subdistrict, Alto Chapare mining district, Chapare Province, Cochabamba, Bolivia
Fibrous blue crocidolite. Harvard Mineralogical Museum, no. 112670.
© 2008 Peter Cristofono
Stirling Brook, Warren Township, Somerset County, New Jersey, USA
Riebeckite var. Touchonite in blocky masses assosiated with minor carnelian and micro metalic black octahedrons of magnetite. 8.5 cm. cut and polished cabochon 2 cm. showing cat's eye effect. Cut by Jason Baskin.
© BDP
This specimine is called " Touchenite. It is a local name for (I think) silicified crocidolite found in the flood plain of the brook. There used to be a filling station where Rolf's restaurant is now located and the local name "Touchenite" is after the name of the owner. Special thanks to Donald Peck for this information.
Brockman Tiger eye mine, Mount Brockman, Ashburton Shire, Western Australia, Australia
Fibre veins containing fibrous quartz and crocidolite (riebeckite) - generally called tigers eye. Specimen 185mm long. Ex K. Lancaster collection. Specimen and photograph A. Tuma
© A. Tuma
Diamond Hill Granite Company quarry, Diamond Hill, Cumberland, Providence County, Rhode Island, USA
Riebeckite crystals frozen in quartz. Collected before 1930. Specimen 6 cm wide. Museum of Natural History, Roger Williams Park, Providence, RI, USA specimen.
© Michael W. Kieron
Salmon Creek, Sonoma County, California, USA
Picture width is 5mm; blue-black crystals of Magnesioriebeckite
© Elmar Lackner 2006
An extremely gemmy Smoky Quartz crystal with a very aesthetic spray of the mineral Riebeckite included within. The Riebeckite that is included in this crystal is hair-like, very distinct and quite easily seen, unlike most riebeckite included Quartz crystals which typically have a jumble of Riebeckite crystals in them.
© Russ Rizzo & Cal Neva Mineral Company
Blue partially fibrous riebeckite. Field of view is about 4 cm across. Blue Hills Trailside Museum specimen. Field collected by G. Stinson Lord in the 1920s. P. Cristofono photo.
FOV 6.3 x 4.6 mm. Found August 1997. Not analyzed. Riebeckite apparently growing on and/or replacing phlogopite in marble xenolith. This is the only time that I ever saw a PSM of this type here.
Ampasibitika, Antsirabe, Ambanja, Diana, Madagascar
Up to 12 cm long riebeckite crystals in an alkaline granite; outcrop photo taken in October 2009 by Wolfgang Hampel.
© Wolfgang Hampel
Picture width 8 mm. Collected by Saul Krotki. Collection and photograph Stephan Wolfsried
© Stephan Wolfsried 2005
FOV 7.1 x 4.7 mm. Found April 2000. Not analyzed. MOB coll. This sample was trapped in a very narrow seam in hornfels. Hence the "exploding star" growth pattern. Flat as a pancake.
Fibrous riebeckite. View is about 3 mm across. P. Cristofono specimen and photo.
© 2010 Peter Cristofono
Dyer Quarry, Gibraltar, Birdsboro, Berks County, Pennsylvania, USA
Fine grained to fibrous green-blue massive riebeckite. S402-351 N793N Needs analysis to confirm exact composition.
© 2010, JGW
Jones Mill Quarry, Magnet Cove, Hot Spring County, Arkansas, USA
An 11mm wide vug full of fibrous xls of blue amphibole.
© C. Stefano '08
Stream worn unaltered riebeckite pebble. 4.5 cm.
Great Misery Island, Beverly, Essex County, Massachusetts, USA
Blue sodic amphibole, radiating crystal aggregate. Probably riebeckite. View is about 6 mm across.
FOV 4.3 x 5.9 mm. Found 1996. Not analyzed. This "straight haired" variety from hornfels is perhaps the most common at MSH. For an example of the "curly haired" variety from marble xenolith, see [https://www.mindat.org/photo-185831.html].
Stove Mountain, El Paso County, Colorado, USA
Crystal showing good faces but not terminated; 5x1.6x1.1cm; Collection of Rudy Bolona.
Sample with 8x7x4cm - December of 1997
Madeira pluton, Pitinga mine, Presidente Figueiredo, Amazonas, Brazil
Black crystals of Riebeckite on matrix. Photo and collection Fernando Brederodes.
Trotter Mine, Franklin Mine, Franklin, Sussex County, New Jersey, USA
Magnesioriebeckite - a 7 x 3 cm bluish grey massive section with felt like texture. From the Trotter Mine, Franklin, New Jersey. See Scalisi Collection label.
© Christopher O'Neill
Crystal with 4x2x1cm - Self-collected in March of 2003
© Bruce Cairncross
40x 20x 15mm Aegirine replaced by riebeckite
Mount Rosa, El Paso County, Colorado, USA
9.7 cm. Riebeckite in matrix from the collection of David J. Eicher.
© David J. Eicher
Blue acicular crystals. View is 2.5 mm across. P. Cristofono specimen and photo, field collected 2009.
Cochabamba, Bolivia
A largish, 8 cm, example of fibrous magnesioriebeckite. S409-051. Alfredo Petrov specimen.
© 2009, JGW