Properties
| Category | Cyclosilicate |
|---|---|
| Formula | Na15Ca6(Fe,Mn)3Zr3SiO(O,OH,H2O)3; (Si3O9)2(Si9O27)2(OH,Cl)2 |
| Crystal system | Trigonal |
| Color | Red, magenta, brown; also blue and yellow |
| Crystal habit | Crystals short rhombohedral to long prismatic, granular, irregular masses |
| Cleavage | Distinct on {0001} imperfect on {1120} |
| Fracture | Uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 5–6 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.74–3.10 |
From the Wikipedia article
Eudialyte, whose name derives from the Greek phrase Εὖ διάλυτος, eu dialytos, meaning "well decomposable", is a somewhat rare, nine-member-ring cyclosilicate mineral, which forms in alkaline igneous rocks, such as nepheline syenites. Its name alludes to its ready solubility in acid.
Source
Source record: crystal-compendium/eudialyte/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Eudialyte — revision id 1305838837. Text and properties from Wikipedia, licensed CC BY-SA 4.0.