mineral general info

Origin: Ilfeld, Nordhausen, Harz Mts., Thuringia, Germany

Sample size: 28 x 28 x 17 mm

Origin: Caland Pit, Atikokan, Hutchinson Township, Rainy River District, Ontario, Canada

Sample size: 10 x 11 x 6.3 cm

Photo courtesy of:

Dan Weinrich

Manganite with rhodochrosite

Origin: N'chwaning Mine, Kalahari, South Africa

Sample size: 6.1 x 4.3 x 2.3 cm (top), 5 x 2.5 x 2 cm (bottom)

Origin: Nchwaning I Mine, Kalahari Manganese Field, South Africa

Sample size: 3.0 x 2.7 x 1.6 cm

Photo courtesy of:

Rob Lavinsky

Black acicular crystals on massive manganite

Origin: Black Jack Mine, Pima Co., Arizona, USA

Sample size: 3 x 5 cm

Photo courtesy of:

Diederik Visser