Global InformationFluorellestadite information
| Fluorellestadite | |
|---|---|
 Fluorellestadite on blue calcite from the Crestmore Quarries, California, US | |
| General | |
| Category | Nesosilicates Apatite structural group |
| Formula (repeating unit) | Ca10(SiO4)3(SO4)3F2[1] |
| IMA symbol | Fel[2] |
| Strunz classification | 9.AH.25 (10 ed) 8/B.27-10 (8 ed) |
| Dana classification | 52.04.09.03 |
| Crystal system | Hexagonal |
| Crystal class | Dipyramidal (6/m) H-M symbol: (6/m) |
| Space group | P63/m |
| Identification | |
| Formula mass | 503.55 g/mol |
| Color | Light red, yellow, bluish green or colorless |
| Crystal habit | Acicular or hexagonal prismatic crystals, and fine-grained aggregates |
| Cleavage | Imperfect on {0001} |
| Fracture | Conchoidal |
| Tenacity | Very brittle |
| Mohs scale hardness | 4+1⁄2 |
| Luster | Sub-resinous to vitreous[3] |
| Streak | White with a weak bluish tint |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 3.03 to 3.07 |
| Optical properties | Uniaxial (-) |
| Refractive index | nω = 1.638(2), nε = 1.632(2);[4] nω = 1.655, nε = 1.650[5] |
| Solubility | Easily soluble in dilute hydrochloric and nitric acids[3] |
| Other characteristics | Sometimes fluorescent. Not radioactive. |
| References | [6][7][8][9] |
Fluorellestadite is a rare nesosilicate of calcium, with sulfate and fluorine, with the chemical formula Ca10(SiO4)3(SO4)3F2.[1] It is a member of the apatite group, and forms a series with hydroxylellestadite.
- ^ a b IMA Mineral List with Database of Mineral Properties. Rruff.info. Retrieved on 2011-06-22.
- ^ 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 Eakle and Rogers (1914) American Journal of Science 37: 262–267 (as Wilkeite)
- ^ Cite error: The named reference
AM74was invoked but never defined (see the help page). - ^ Cite error: The named reference
AM22was invoked but never defined (see the help page). - ^ Richard V. Gaines (1997) Dana’s New Mineralogy 8th ed. Wiley ISBN 0-471-19310-0
- ^ Fluorellestadite: Fluorellestadite mineral information and data. Mindat.org (2011-06-18). Retrieved on 2011-06-22.
- ^ Ellestadite-(F) Mineral Data. Webmineral.com. Retrieved on 2011-06-22.
- ^ Handbook of Mineralogy. Handbook of Mineralogy. Retrieved on 2011-06-22.