| 词条 | Hibonite |
| 释义 |
| name = Hibonite | boxwidth = | boxbgcolor = | image = Hibonite - Esiva eluvials, Tulear Province, Madagascar.jpg | imagesize = | alt = | caption = Hibonite, 1.6 cm sharp and lustrous crystal from Esiva eluvials, Maromby Commune, Amboasary District, Anosy (Fort Dauphin) Region, Tuléar (Toliara) Province, Madagascar | category = Oxide minerals | formula = (Ca,Ce)(Al,Ti,Mg)12O19 | molweight = | strunz = 4.CC.45 | dana = | system = Hexagonal | class = Dihexagonal dipyramidal (6/mmm) H-M symbol: (6/m 2/m 2/m) | symmetry = P63/mmc | unit cell = a = 5.56, c = 21.89 [Å]; Z = 2 | color = Brownish black to black; reddish brown in thin fragments; blue in meteorite occurrence | colour = | habit = Prismatic platy to steep pyramidal crystals | twinning = | cleavage = {0001} good, {10{{overline|1}}0} parting | fracture = Subconchoidal | tenacity = | mohs = {{frac|7|1|2}}-8 | luster = Vitreous | streak = reddish brown | diaphaneity = Semitransparent | gravity = 3.84 | density = | polish = | opticalprop = Uniaxial (-) | refractive = nω = 1.807(2), nε = 1.79(1) | birefringence = | pleochroism = O = brownish gray; E = gray | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = [1][2] }}Hibonite ((Ca,Ce)(Al,Ti,Mg)12O19) is a mineral, occurring in various colours, with a hardness of 7.5–8.0 and a hexagonal crystal structure. It is rare, but is found in high-grade metamorphic rocks on Madagascar. Some presolar grains in primitive meteorites consist of hibonite. Hibonite also is a common mineral in the Ca-Al-rich inclusions (CAIs) found in some chondritic meteorites. Hibonite is closely related to hibonite-Fe (IMA 2009-027, ((Fe,Mg)Al12O19)) an alteration mineral from the Allende meteorite.[3] A very rare gem, hibonite was discovered in 1953 in Madagascar by Paul Hibon, a French prospector.[4] ColourHibonite can vary in colour, from a bright blue, to green, to orange, to a nearly black deep brown. The colour is related to the degree of oxidation; meteoritic hibonite tends to be blue.[5] See also
References
1. ^{{cite web|url=http://rruff.geo.arizona.edu/doclib/hom/hibonite.pdf|title=Handbook of Mineralogy|publisher=}} {{Commons category|Hibonite}}{{Meteorites}}{{oxide-mineral-stub}}2. ^{{cite web|url=http://www.mindat.org/min-1897.html|title=Hibonite: Hibonite mineral information and data.|website=www.mindat.org}} 3. ^{{cite web|url=http://rruff.info/ima/|title=IMA Mineral List with Database of Mineral Properties|website=rruff.info}} 4. ^{{cite web|url=http://www.gemdat.org/gem-1897.html|title=Hibonite gemstone information|website=www.gemdat.org}} 5. ^{{cite journal |last1=Ihinger |first1=Phillip D. |last2=Stolper |first2=Edward |title=The color of meteoritic hibonite: an indicator of oxygen fugacity |journal=Earth and Planetary Science Letters |volume=78 |issue=1 |date=May 1986 |pages=67–79 |doi=10.1016/0012-821X(86)90173-1}} 6 : Calcium minerals|Lanthanide minerals|Aluminium minerals|Oxide minerals|Meteorite minerals|Hexagonal minerals |
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