1.7" Pink Olmiite On Matrix - South Africa

 
 
This is an aggregation of Olmiite crystals on a Manganese rich matrix. In natural light, the crystals display a pinkish-brown color, while presenting a pinkish-red color under artificial light. Small calcite crystals can also be observed on portions of the matrix, as well as a small amount of Xonolite that formed into a small cavity in the matrix.

Poldervaartite is a Calcium and Manganese based mineral, which features Ca as the dominant molecule, this is notable from its chemical formula (Ca2,Mn)[SiO3(OH)](OH). This is very similar to Olmiite, a Mn dominant mineral with the chemical formula CaMn[SiO3(OH)](OH). Both are found in association with each other in few known locations in South Africa, most commonly throughout the Kalahari Manganese Fields.

Poldervaartite tends to consist of a peach color, enshrouded in a transparent mineral sheath. While Olmiite typically exhibits more of a salmon color, with little to no transparency depending on the specimens Mn content. Olmiite also displays a deep red fluorescent color when placed under short-wave UV-light.
DETAILS
SPECIES
Poldervaartite/Olmiite
LOCATION
Kalahari Manganese Field, South Africa
SIZE
1.7x1.4", Largest Crystal .6"
ITEM
#37742