EG66R9: Growths of Quartz crystals forming irregular bundles. The crystals are completely coated by intensely bright and iridescent oxides of iron and manganese. On a matrix of Limonite.
This specimen was published on the Mineralogical Record´s web page, in the ‘What’s New in the Mineral World?’ section of the March 10, 2011 edition.
Banská Štiavnica (Schemnitz), Banská Štiavnica District, Banská Bystrica Region  Slovak Republic (2009)

Specimen size: 11.5 × 6 × 4 cm = 4.53” × 2.36” × 1.57”

Main crystal size: 1.1 × 0.3 cm = 0.43” × 0.12”