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| Gehlenite | |
|---|---|
 | |
| General | |
| Category | Sorosilicates |
| Formula (repeating unit) | Ca2Al[AlSiO7] |
| IMA symbol | Gh[1] |
| Strunz classification | 9.BB.10 |
| Crystal system | Tetragonal |
| Crystal class | Scalenohedral (42m) H-M symbol: (4 2m) |
| Space group | P421m |
| Identification | |
| Colour | yellow-brown, green-grey, colourless |
| Cleavage | Distinct/good |
| Mohs scale hardness | 5–6 |
| Lustre | vitreous, greasy |
| Streak | white, grey-white |
| Birefringence | δ = 0.010 |
Gehlenite, (Ca2Al[AlSiO7]), is a sorosilicate, Al-rich endmember of the melilite complete solid solution series with akermanite.[2][3] The type locality is in the Monzoni Mountains, Fassa Valley in Trentino in Italy,[3] and is named after the Adolf Ferdinand Gehlen (1775–1815) by A.J. Fuchs in 1815.[4]
- ^ 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.
- ^ Deer et al., 1993
- ^ a b Gehlenite: Gehlenite mineral information and data
- ^ Dana et al. 1997