Origin: Tsumeb, Namibia
ex. Richard Barstow Collection
Sample size: 6 x 4.5 x 4 cm
Hematite-stained chalcedony
Origin: San Luis Potosi, Mexico
(ex. Gerald Herfurth Collection)
Sample size: 7.5 x 6.5 x 5.5 cm
Chalcedony pseudomorph after fluorite
Origin: Trestia, south of Cavnic, Muramures, Romania
Sample size: 7 x 5 x 2.5 cm
Origin: Nasik, Maharashtra, India
Sample size: 11 x 7 x 6 cm
Chalcedony pseudomorph after ?
Origin: Wessels Mine, near Kuruman, South Africa
Sample size: 6.4 x 5.3 x 2.7 cm
Origin:  Mexico
Sample size: 13.7 x 10.0 x 9.3 cm

Photo courtesy of: 

Rob Lavinsky

The Arkenstone


Chalcedony pseudomorph after fluorite
Origin: Santa Monica Mts., Los Angeles Co., California, U.S.A.
Owner: Natural History Museum of Los Angeles County
Sample size: crystal about 1.5 cm

Photo courtesy of: 

Anthony Kampf, Natural History Museum of Los Angeles County

Photo-Atlas of Minerals


Origin: Mohave County, Arizona
Owner: Milton Speckels
Sample size: 2.3 cm wide
Origin: Coffin Butte, Douglas Co., Oregon, U.S.A.
Owner: Milton Speckels
Microscopic image, 5.2 x
Origin: Opal Hill mine (N of Palo Verde), Riverside Co, California, U.S.A.
Owner: Milton Speckels
Microscopic image, 2 cm across

Photo courtesy of: 

Milton Speckels

Photo-Atlas of Minerals


Origin: Mexico
Sample size: 11 x 9.5 x 7 cm
A concave, shell-like matrix, the one side covered by colorless smooth chalcedony, this forming thin terminated and undamaged stalactites to 15 mm in length.
Origin: Cannel Creek, near Kamloops, British Columbia, Canada
Sample size: 9 x 7 x 3.5 cm
White chalcedony hosting small sparkling quartz crystals
Origin: Jessieville, Arkansas, U.S.A.
Sample size: 24 x 27 x 15 mm

Photo courtesy of: 

Dan Weinrich

Dealer in fine mineral specimens


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Rock crystal     Smoky quartz     Citrine     Amethyst     Rose quartz     Milky quartz     Included quartz     Other quartz types     Agate     Jasper


Back to Alphabetical list Physical, chemical and crystallographic description Optical properties/Thin sections SEM images TEM images vibrational spectra description IR spectra Raman spectra N-IR spectra F-IR spectra IES spectra