| 词条 | Neptunite |
| 释义 |
| name = Neptunite | category = Phyllosilicate | boxwidth = | boxbgcolor = | image = Neptunite, bénitoïte, joaquinite-(Ce) sur natrolite et serpentine (USA) 2.jpg | imagesize = 260 | caption = Neptunite crystals | formula = KNa2Li(Fe2+,Mn2+)2Ti2Si8O24 | dana = 70.04.01.01 | strunz = 9.EH.05 | system = Monoclinic | class = Domatic (m) (same H-M symbol) | symmetry = Cc | unit cell = a = 16.427(2), b = 12.478(2) c = 9.975(1) Å; β = 115.56(1)°; Z = 4 | color = Black; deep red-brown in thin fragments | habit = Prismatic or tabular | twinning = Interpenetrant on {301} | cleavage = {110} good | fracture = Conchoidal | tenacity = Brittle | mohs = 5-6 | luster = Vitreous | refractive = nα=1.69-1.6908, nβ=1.6927-1.7, nγ=1.7194-1.736 | opticalprop = Biaxial (+) | 2V = 36° to 49° | birefringence = 0.0294-0.0452 | pleochroism = x=yellow-orange, y=orange, z=deep red | streak = Brown to red brown | gravity = 3.19 - 3.23 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Nearly opaque | other = Piezoelectric | references = [1][2][3] }} Neptunite is a silicate mineral with the formula KNa2Li(Fe2+, Mn2+)2Ti2Si8O24. With increasing manganese it forms a series with mangan-neptunite. Watatsumiite is the variety with vanadium replacing the titanium in the formula. It was first described in 1893 for an occurrence in the Narssârssuk pegmatite of West Greenland.[2] It is also found within natrolite veins in glaucophane schist within serpentinite in San Benito County, California, US. It also occurs in Mont Saint-Hilaire, Quebec and in the Kola Peninsula of Russia.[1] The mineral is named for Neptune, Roman god of the sea because of its association with aegirine from Àgir, the Scandinavian sea-god.[2] The Gemological Institute of America (GIA) identified an 11.78-carat faceted specimen as neptunite based on Raman spectroscopy.[4] References1. ^1 Mineral Handbook {{silicate-mineral-stub}}2. ^1 2 Mindat with location data 3. ^Webmineral 4. ^GIA 6 : Phyllosilicates|Potassium minerals|Lithium minerals|Sodium minerals|Titanium minerals|Monoclinic minerals |
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