Fluellite

{{Infobox mineral

| name = Fluellite

| category = Phosphate minerals

| image = Fluellite-111339.jpg

| imagesize = 260px

| alt =

| caption = Fluellite from Leveäniemi Mine, Svappavaara, Kiruna district, Lappland, Sweden

| formula = Al₂(PO₄)F₂(OH)•7H₂O

| IMAsymbol = Fll{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}

| molweight =

| strunz = 8.DE.10

| dana =

| system = Orthorhombic

| class = Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)

| symmetry = Fddd

| color = Colorless, white, pale yellow

| colour =

| habit = Dipyramidal crystals commonly in aggregates; powdery, massive

| twinning =

| cleavage = Indistinct on {001} and {111}

| fracture =

| tenacity =

| mohs = 3

| luster = Vitreous

| streak =

| diaphaneity = Transparent

| gravity = 2.18

| density =

| polish =

| opticalprop = Biaxial (+)

| refractive = n_α = 1.473 - 1.490 n_β = 1.490 - 1.496 n_γ = 1.506 - 1.511

| birefringence = δ = 0.033

| pleochroism =

| 2V =

| dispersion =

| extinction =

| length fast/slow =

| fluorescence= Fluorescent, Long UV=creamy white

| absorption =

| melt =

| fusibility =

| diagnostic =

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| references = http://rruff.geo.arizona.edu/doclib/hom/fluellite.pdf Handbook of Mineralogyhttp://webmineral.com/data/Fluellite.shtml Webmineral datahttp://www.mindat.org/min-1565.html Mindat.org

}}

Fluellite is a mineral with the chemical formula Al₂(PO₄)F₂(OH)•7H₂O. The name is from its chemical composition, being a fluate of alumine (French).

It was first described in 1824 for an occurrence in the Stenna Gwyn Mine, St Stephen-in-Brannel, St Austell District, Cornwall, England.

It is a rare secondary mineral found in complex granite pegmatites where it forms by weathering of earlier phosphate minerals. It is found in association with fluorapatite, wavellite, phosphosiderite, strengite, aldermanite, cacoxenite, variscite, turquoise, fluorite and quartz.