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Mineralpedia Details for Meurigite-K

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Meurigite-K

Meurigite-K

Named for Professor John Meurig Thomas, who was a crystal chemist at the University of Cambridge in England. The name Meurigite originally referred to just the potassium-dominant species, however, later meurigites were discovered to be sodium-dominant. A rare mineral at all localities, Meguirite forms late stage. At its type locality at the Santa Rita mine in New Mexico, USA it forms along fault gouge in an oxidized copper sulfide deposit. At other localities it forms from altered triphylite in granite pegmatites, and in oxidized, low-temperature hydrothermal gold deposits.

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

Formula
[K(H2O)2.5][Fe3+8(PO4)6(OH)7]·4H2
Crystal System
Monoclinic 
Crystal Habit
Tabular, Spherical 
Cleavage
Good, None, None 
Luster
Silky 
Color
white, cream, yellowish brown, pale yellow, canary yellow 
Streak
pale yellowish white 
Class
Monoclinic - Prismatic 
Hardness
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Meurigite-K from Těškov quarry, SE of Prague, Bohemia, Czech Republic

Meurigite-K
            from Těškov quarry, SE of Prague, Bohemia, Czech Republic

Crystal balls composed of orange, radial acicular sprays to about 0.75mm.

Yellow to orange fibrous and complete semi-spheres of radial acicular sprays to about 0.75mm in diameter.

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Meurigite-K from Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany

Meurigite-K
            from Hagendorf-Süd, Oberpfälzer Wald, Bavaria, Germany

Yellow-green spheroidal crystals to 0.1mm, compact in a 5mm vug in probably Rockbridgeite matrix.

Light yellowish green spheroidal crystals to about 0.3mm.

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Meurigite-K from Silver Coin mine, Humboldt Co., Nevada, United States

Meurigite-K
            from Silver Coin mine, Humboldt Co., Nevada, United States

Golden yellow fibrous radial aggrgates to about 0.5mm.

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