Eudialyte
| Colour | Red, Pink, Brown, Blue |
|---|---|
| Mohs hardness | 5–6 |
| Lustre | Vitreous |
| Streak | White |
| Crystal system | Trigonal |
| Transparency | Transparent to translucent |
| Cleavage | Distinct on {0001} imperfect on {110} |
| Fracture | Uneven |
| Chemical formula | Na 15 Ca 6 (Fe,Mn) 3 Zr 3 SiO(O,OH,H 2 O) 3 (Si 3 O 9 ) 2 (Si 9 O 27 ) 2 (OH,Cl) 2 |
| Specific gravity | 2.74–3.10 |
What is Eudialyte?
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.
How to identify Eudialyte
- Lustre: Vitreous.
- Hardness: Mohs 5–6 — about as hard as a steel knife.
- Streak: White.
- Habit: Trigonal crystal system.
Eudialyte in different forms
Stones often confused with Eudialyte
Frequently asked questions
How hard is Eudialyte?
Eudialyte is Mohs 5–6 on the hardness scale.
What colour is Eudialyte?
Eudialyte is typically red, pink, brown, blue (Red, magenta, brown; also blue and yellow).