Mineralpedia Details for 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]·4H2O
- 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
- 3
- WebMineral
- View Meurigite-K
- Mindat
- View Meurigite-K
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.
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.
Meurigite-K from Silver Coin mine, Humboldt Co., Nevada, United States
Golden yellow fibrous radial aggrgates to about 0.5mm.
