| Haüyne | |
|---|---|
 Hauyne from Mayen, Eifel Mts, Rhineland-Palatinate, Germany | |
| General | |
| Category | Tectosilicate, sodalite group |
| Formula (repeating unit) | Na3Ca(Si3Al3)O12(SO4)[1] |
| IMA symbol | Hyn[2] |
| Strunz classification | 9.FB.10 (10 ed) 8/J.11-30 (8 ed) |
| Dana classification | 76.2.3.3 |
| Crystal system | Isometric |
| Crystal class | Hextetrahedral (43m) H-M symbol (4 3m) |
| Space group | P43n |
| Unit cell | a = 9.08 – 9.13 Å; Z = 2 |
| Identification | |
| Formula mass | 1,032.43 g/mol[3] |
| Color | Blue, white, gray, yellow, green, pink |
| Crystal habit | Dodecahedral or pseudo-octahedral |
| Twinning | Common on {111} |
| Cleavage | Distinct on {110} |
| Fracture | Uneven to conchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 5 to 6 |
| Luster | Vitreous to greasy |
| Streak | Very pale blue to white |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.4 to 2.5 |
| Optical properties | Isotropic |
| Refractive index | n = 1.494 to 1.509 |
| Birefringence | None, isotropic |
| Pleochroism | None, isotropic |
| Fusibility | 4.5[4] |
| Solubility | Gelatinises in acids |
| Other characteristics | May fluoresce orange to pink under longwave ultraviolet light[5][6] |
| References | [3][4][5][6] |
Hauyne or haüyne, also called hauynite or haüynite (/ɑːˈwiːnaɪt/ ah-WEE-nyte),[7] old name Azure spar,[8]: 571 is a rare tectosilicate sulfate mineral with endmember formula Na3Ca(Si3Al3)O12(SO4).[1] As much as 5 wt % K2O may be present, and also H2O and Cl. It is a feldspathoid and a member of the sodalite group.[4][5] Hauyne was first described in 1807 from samples discovered in Vesuvian lavas in Monte Somma, Italy,[9] and was named in 1807 by Brunn-Neergard for the French crystallographer René Just Haüy (1743–1822).[4] It is sometimes used as a gemstone.[10]
- ^ a b "IMA Mineral List with Database of Mineral Properties".
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b "Hauyne". Webmineral.com.
- ^ a b c d Gaines et al (1997) Dana’s New Mineralogy Eighth Edition. Wiley
- ^ a b c "Hauyne". Mindat.org.
- ^ a b "Handbook of Mineralogy" (PDF). Archived from the original (PDF) on 2020-04-10. Retrieved 2011-11-19.
- ^ "haüynite". Dictionary.com Unabridged (Online). n.d. Retrieved 4 June 2016.
- ^ The Edinburgh Encyclopaedia, 1st American ed., Volume 13. — J. and E. Parker edition, 1832.
- ^ Farndon and Parker (2009). Minerals, Rocks and Fossils of the World. Lorenz Books
- ^ Tables of Gemstone Identification By Roger Dedeyne, Ivo Quintens, p.109