{{Infobox mineral | name = Segelerite | SMILES = | Jmol = | image = Segelerite-710278.png | caption = Pale yellow needle-like crystals of segelerite | category = Phosphate minerals | formula = Ca2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2O | IMAsymbol = Sgl<ref>{{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}}</ref> | molweight = | strunz = | dana = | system = Orthorhombic | class = | symmetry = | unit cell = | color = Green, chartreuse, colorless, pale yellow | habit = | twinning = | cleavage = Perfect | fracture = | tenacity = | toughness = | mohs = | luster = Vitreous | streak = White | diaphaneity = | gravity = 2.67 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | Curie temp = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = | var3 = | var3text = | var4 = | var4text = | var5 = | var5text = | var6 = | var6text = }} '''Segelerite''' is a complex phosphate mineral with formula CaMgFe<sup>3+</sup>OH(PO<sub>4</sub>)<sub>2</sub>'''·'''H<sub>2</sub>O. It occurs in pegmatites and forms striking green or chartreuse crystals. It was discovered in 1974 in the Black Hills of South Dakota by an amateur mineralogist from New York, Curt G. Segeler (1901–1989), after whom it is named.
It is closely related to ''overite'' which is virtually the same mineral except that the iron is replaced by aluminium. Another mineral in the same series is ''juonniite'' wherein the iron is also replaced, this time by scandium.
==References== {{reflist}} *[http://webmineral.com/data/Segelerite.shtml Webmineral.com - Segelerite] *[http://www.mindat.org/min-3605.html Mindat.org - Segelerite] *[http://www.handbookofmineralogy.com/pdfs/segelerite.pdf Handbook of Mineralogy - Segelerite]
Category:Calcium minerals Category:Magnesium minerals Category:Iron(III) minerals Category:Phosphate minerals Category:Orthorhombic minerals Category:Minerals in space group 61
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