Kyanite translucent orange crystals from Nani, Loliondo, Arusha Region, Tanzania. Kyanite is an aluminum silicate; it is normally dark blue. The orange color is from a substitution of a small amount of Mn+++ in one of the four Al sites.
RHODOCHROSITE. A superb specimen with an impressive coverage of spherical aggregates of gemmy prismatic crystals of Rhodochrosite. Each "ball" is c. 1cm in diameter and contrasts well against a manganese oxide rich matrix. Spectacular colour and form!
Shigaite crystal. A very uncom-mon mineral, this extremely hydrated (has 8 to 22 waters in its chemical formula) Mangan-ese-Aluminum sulfate is captured here in a Joe Budd image. Shigaite was discovered in Shiga Perfecture, Japan, 27 years ago. Shigaite is also found in Michigan's Iron Range, Mont Saint-Hilaire-Quebec, and at the Wessels Mine in South Africa.