Fluoro-edenite is a rare amphibole mineral that contains sodium, calcium, magnesium, aluminium, silicon, oxygen and fluorine. It belongs to the same family as the more common mineral edenite but has fluorine as a key component. Fluoro-edenite was first discovered in volcanic rocks near the town of Biancavilla on the south-western flank of Mount Etna in Sicily. It has since been reported in smaller amounts in other locations.
{{Infobox mineral | name = Fluoro-edenite | boxwidth = | boxbgcolor = | image = Fluoro-edenite9388-9.jpg | imagesize = | alt = | caption = Fluoro-edenite | SMILES = | Jmol = | category = Inosilicate minerals, amphibole group | formula = | IMAsymbol = Fed | molweight = | strunz = 9.DE.15 | dana = | system = Monoclinic | class = 2/m - Prismatic | symmetry = P2/m (space group 10) | unit cell = a = 9.847 Å, b = 18.017 Å, c = 5.268 Å β = 104.84° | color = | colour = Light green to light yellow, grey-black | habit = Prismatic, acicular, fibrous (asbestiform) | twinning = None mentioned | cleavage = Perfect on {110} | fracture = | tenacity = Brittle | mohs = 5 - 6 | luster = Vitreous | streak = Grey-white, yellowish white | diaphaneity = | gravity = 3.09 (Calculated) | density = 3.09 g/cm3 (Calculated) | polish = | opticalprop = Biaxial (-) | refractive = nα = 1.6058(5) nβ = 1.6170(5) nγ = 1.6245(5) | birefringence = δ = 0.019 | pleochroism = Not visible | 2V = Calculated: 78° | dispersion = r 2Mg5(Si7Al)O22F2, which means it is made mainly of sodium, calcium and magnesium combined with silica, aluminium and fluorine. Like other amphiboles, its structure is based on double chains of silica tetrahedra, and it crystallises in the monoclinic crystal system. X-ray and infrared studies show that its atomic arrangement is very similar to other fluorine-rich amphiboles in the edenite–pargasite series.
==Location== Fluoro-edenite was first discovered in Monte Calvario, close to Biancavilla in eastern Sicily. Here, Fluoro-endnite occurs as prismatic and fibrous crystals in benmoreitic lava that has been altered by hot, fluorine-rich fluids rising through the volcanic rocks of Mount Etna. The same rock has been quarried for sand and aggregate used in local building and road works, which has spread fluoro-edenite fibres into the surrounding environment.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).