mineral

Keldishite

Keldishite (NaZr[Si2O6OH](OH)2)

Mohs hardness of 4 to 5, pinkish-white to reddish coloration, vitreous luster, and monoclinic crystal system.

Identified October 17, 2026More mineral →

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Physical properties

Mohs hardness of 4 to 5, pinkish-white to reddish coloration, vitreous luster, and monoclinic crystal system.

Formed in alkaline pegmatites, typically associated with rare-earth and zirconium-bearing mineral assemblages.

Primarily a collector mineral due to its rarity and unique chemical composition.

Named after the prominent Soviet mathematician Mstislav Keldysh, this rare cyclosilicate was first discovered in the Kola Peninsula of Russia.

Identified through X-ray diffraction and chemical analysis, typically found in complex alkaline rock intrusions like nepheline syenites.

Gneiss or Schist

Gneiss or Mica Schist with Garnet

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Tumbled granite

Granite, a coarse-grained felsic intrusive igneous rock

Pegmatite with Tourmaline and Quartz

Igneous Pegmatite

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Granite

Granite (Phaneritic intrusive igneous rock)