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Search Mineralpedia – A Mineral Photo Database and Identification Guide


Named honor the contributions to mineralogy and nuclear physics that Swiss physicist Paul Scherrer had made. It is a rare mineral found at the No. 2 workings at Radium Ridge in the Mt. Painter area of Flinders Ranges in South Australia, Australia, which is its type locality, and in New Hampshire in the United States in the Ruggles and Palermo No. 1 mines. It is a canary yellow mineral that appears as tabular crystals. It is radioactive, but does not fluoresce under ultraviolet light. It has also been reported under the name “dehydrated schoepite” as a weathering product of uraninite and/or pitchblende.

Ref. Brugger, J., et al. and American Mineralogist February-March v. 96 no. 2-3 p. 229-240


Named after Dr. Richard Pearce, a Cornish-American chemist and metallurgist from Colorado, USA. Pearceite forms in hydrothermal deposits of low to medium temperatures and forms a series with polybasite. It can be found in a couple hundred localities including in the United States, Canada, Mexico, Chile, Slovakia, Germany, Spain, Italy, the Channel Islands, and Japan among other minor localities. Pearceite was originally thought to be the arsenic analogue of polybasite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/pearceite.pdf


Named after Dr. William Thomas Pecora, a former Director of the United States Geological Survey who studies nickel silicate deposits. Pecoraite is an uncommon mineral that forms as a result of the weathering of nickel-iron meteorite fragments in arid climates, along shear zones in ultramafic Archaean rocks, and in geodes. Pecoraite can be found in Australia, the United States, and Russia, among only a few others.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/pecoraite.pdf


Named for the Greek word pektos, meaning “compact,” in reference to its resistance to being crushed. Pectolite is a widespread mineral with many localities including in Italy, Germany, Scotland, Russia, the United States, Canada, India, Morocco, and South Africa, to name just a few. Pectolite occurs in nepheline syenite, as a hydrothermal mineral in basalts and diabases, in serpentinites, peridotites and calcium-rich rocks. Pectolite can be triboluminescent, produces light when broken.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/pectolite.pdf


Named in honor of Professor Samuel Lewis Penfield, a mineralogist and mineral chemist at Yale University in Connecticut, USA. Penfieldite is a rare mineral found in Greece, Italy, and Chile among a couple other localities and forms as “an alteration product of lead-bearing slag immersed in seawater” and in oxidized lead deposits of hydrothermal origin. Penfieldite is soluble in water and leaves behind a yellow-white lead-oxychloride residue.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/penfieldite.pdf

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