Specimen #531

Name: Calcite after Ikaite var. Glendonite

Type: Mineral

Locality: Kola Peninsula, Russia

Favorite? N

Fluorescent? N

Size: 10.3 x 7.7 x 5.9 cm


Acquired: 2007-11-07

Source: Arkenstone: Rob Lavinsky

Label: Y

Comment: ex. Martin Zinn, This mineralogical oddball actually features 4.5 cm, orange-brown crystals of calcite pseudomorphing a rare calcium carbonate, ikaite, commonly known as 'glendonite'. Although these oddities are admittedly esoteric and hard to explain, visually they can be spectacular, like this one. Rob Lavinsky's comments from another specimen: This stuff has confused collectors since it first came to market in the early 90s as calcite after something embedded in concretions, then glendonite after ikaite, then as calcite after ikaite; and now classified as CALCITE VARIETY THINOLITE, which is PSEUDOMORPH AFTER AN UNKNOWN MINERAL. No more Ikaite in the name. Also see: http://www.mindat.org/min-11409.html

Minerals: Calcite (CaCO3) Glendonite (calcite pseudomorphs) Ikaite (CaCO3 6(H2O)) Thinolite (calcite pseudomorphs)

There are 4 pictures on file


Calcite after Ikaite var. Glendonite, Kola Peninsula, Russia - 10.3 x 7.7 x 5.9 cm F: 1