... The type locality for the upper Oligocene Nuwok Member of the Sagavanirktok Formation (Carter Creek, North Slope, Alaska, USA) contains an abundant occurrence of glendonite, a pseudomorph after the calcium-carbonate mineral ikaite, which typically forms in the shallow subsurface of cold marine sediments...

.... This mineral is metastable and quickly transforms to calcite at temperatures above 5 °C. Pseudomorphs of calcite after ikaite are known as glendonite. The nanostructure of 25 000–43 000 year old glendonite from Victoria cave (Southern Ural, Russia) was investigated in search of structural features indicative...

...Stephen E. Grasby; Gennyne E. McCune; Benoit Beauchamp; Jennifer M. Galloway Abstract Dramatic global climate change in the Early Cretaceous suggests that numerous boreal cool events perturbed otherwise warm conditions. Abundant glendonites in Valanginian and Aptian strata are thought to be key...

... maintained and the product is referred to as glendonite. Glendonite is consequently not a mineral but a pseudomorph of calcite after ikaite. Both ikaite and glendonite have been known for a long time, but the derivation of glendonite from ikaite was only confirmed after crystal aggregates of ikaite...

... warming events associated with major carbon cycle perturbations. Paradoxically, many of these extreme greenhouse episodes are preceded or followed by cold climate, perhaps even glacial conditions, as inferred from the occurrence of glendonites in high latitudes. Glendonites are pseudomorphs of ikaite...

... in the geological past is very limited due to the paucity of insights that this compound leaves in the rock record after its destabilization. Calcite pseudomorphs after ikaite (CaCO 3 ·6H 2 O), also known as glendonites, are here documented in Oligocene seep carbonates from the Outer Carpathians in southern Poland...

... and paleobiological data are shaping current understanding of Ediacaran evolutionary and environmental history. Here, we report the occurrence of silicified glendonites in the Ediacaran Doushantuo Formation deposited in an inner-shelf environment on the South China block. Petrographic evidence suggests...

...Ian P. Swainson; Robert P. Hammond Abstract Neutron diffraction results are linked to the pre-diffraction, morphological crystallography of E.S. Dana to show that ikaite is the precursor of “glendonite” and “thinolite” and that some of the unusual features of the morphology can easily be explained...

...I. R. McLachlan; H. Tsikos; B. Cairncross Abstract Glendonites are carbonate pseudomorphs after monoclinic crystals of ikaite (calcium carbonate hexahydrate: CaCO 3 .6H 2 O). Ikaite forms at present within organic-rich marine or brackish sediments that are at near freezing temperatures...

...Fig. 5. Optical characteristics of the studied glendonites and host concretions in plane-polarized light. A) Sample Sn-1 (glendonite). B) Sample Bal-6 (glendonite). C) Sample Bal-2 (Glend, glendonite; Conc, host concretion). D) Sample Bal-4 (host concretion). White arrows point at needle...