mineral
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
Hardness: 5-5.5. Color: Magenta, red, pink, brownish-yellow. Luster: Vitreous. Crystal structure: Trigonal. Specific gravity: 2.7–3.0. Distinctive uneven fracture.
- Hardness
- 5-5
- Color
- Magenta, red, pink, brownish-yellow
- Luster
- Vitreous
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Physical properties
Hardness: 5-5.5. Color: Magenta, red, pink, brownish-yellow. Luster: Vitreous. Crystal structure: Trigonal. Specific gravity: 2.7–3.0. Distinctive uneven fracture.
Formation & geological history
Formed in alkaline igneous rocks, particularly nepheline syenites. It occurs in Late Paleozoic to Mesozoic intrusions in specific kratonic environments.
Uses & applications
Primarily a collector's mineral and minor source of zirconium and rare earth elements; occasionally used in lapidary work and jewelry.
Geological facts
Named in 1819 after the Greek words for 'well' and 'dissoluble' because it dissolves easily in acids. It is often radioactive due to trace contents of thorium.
Field identification & locations
Identify by its bright magenta/purple-red color within a white or black host rock. Found in the Kola Peninsula (Russia), Greenland, Canada, and Arkansas, USA.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous