| Lucchesiite | |
|---|---|
 | |
| General | |
| Category | Cyclosilicates Tourmaline group |
| Formula (repeating unit) | CaFe3Al6(Si6O18)(BO3)3(OH)3O |
| IMA symbol | Lcc |
| Crystal system | Trigonal |
| Crystal class | Ditrigonal pyramidal (3m) (same H-M symbol) |
| Space group | R3m |
| Unit cell | a = 16.00, c = 7.21 (approximated); Z = 3 |
| Identification | |
| Color | Black |
| Crystal habit | Thin tablets |
| Fracture | Conchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 7 |
| Luster | Vitreous |
| Streak | Grey |
| Density | 3.21 (calc.), 3.24 (meas.) (approximated) |
| Optical properties | Uniaxial (-) |
| Pleochroism | Very dark brown to light brown |
| References | |
Lucchesiite is a new member of tourmaline-group of minerals. Lucchesiite has the formula CaFe3Al6(Si6O18)(BO3)3(OH)3O. It is the calcium and oxygen-analogue of schorl. It has two co-type localizations, one in Czech Republic and the other in Sri Lanka. As the other members of the tourmaline group, it is trigonal.
Notes on chemistry
Impurites in lucchesiite, depending on the provenience, are sodium, magnesium, aluminium, titanium, trivalent iron, and minor vanadium, potassium, manganese and zinc.
References
- 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.
- ^ Bosi, F., Skogby, H., Ciriotti, M.E., Gadas, P., Novák, M., Cempírek, J., Všianský, D., and Filip, J., 2016. Lucchesiite, CaFe3Al6(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup. Mineralogical Magazine 80(1)
- ^ Bosi, F., Skogby, H., Ciriotti, M.E., Gadas, P., Novák, M., Cempírek, J., Všianský, D., and Filip, J., 2015. Lucchesiite, IMA2015-043. CNMNC Newsletter No. 27, October 2015, page ; Mineralogical Magazine 79, 1229–1236
- ^ "Lucchesiite: Lucchesiite mineral information and data". Mindat.org. Retrieved 2016-03-04.
 | This article about a specific mineral or mineraloid is a stub. You can help Misplaced Pages by expanding it. |