| 词条 | Ludlamite |
| 释义 |
| name = Ludlamite | image = Ludlamite-md87a.jpg | imagesize = 200px | alt = | caption = | category = Phosphate mineral | formula = (Fe,Mn,Mg)3(PO4)2·4H2O | molweight = | strunz = 8.CD.20 | dana = | system = Monoclinic | class = Prismatic (2/m) (same H-M symbol) | symmetry = P21/a | unit cell = a = 10.541(5), b = 4.646(4) c = 9.324(5) [Å]; β = 100.52°; Z = 2 | color = Apple-green to bright green | colour = | habit = Tabular crystals; massive, granular | twinning = | cleavage = Cleavage: perfect on {001}, indistinct on {100} | fracture = | tenacity = | mohs = 3.5 | luster = Vitreous, pearly on cleavage | streak = Pale greenish white | diaphaneity = Translucent | gravity = 3.12–3.19 | density = | polish = | opticalprop = Biaxial (+) | refractive = nα = 1.650 - 1.653 nβ = 1.669 - 1.675 nγ = 1.688 - 1.697 | birefringence = δ = 0.038 - 0.044 | pleochroism = | 2V = Measured: 82° | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | references = [1][2][3] }} Ludlamite is a rare phosphate mineral with formula: (Fe,Mn,Mg)3(PO4)2·4H2O. It was first described in 1877 for an occurrence in Wheal Jane mine in Cornwall, England and named for English mineralogist Henry Ludlam (1824–1880). OccurrenceIt occurs in granite pegmatites and as a hydrothermal alteration product of earlier phosphate bearing minerals in a reducing environment.[3] It occurs associated with whitlockite, vivianite, triploidite, triplite, triphylite, siderite, phosphoferrite, fairfieldite and apatite.[1] References1. ^1 Mindat.org 2. ^Webmineral.com 3. ^1 Handbook of Mineralogy External links{{commonscat-inline|ludlamite}}{{phosphate-mineral-stub}} 2 : Phosphate minerals|Monoclinic minerals |
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