| 词条 | Zirkelite |
| 释义 |
| name = Zirkelite | boxwidth = | boxbgcolor = | image = | imagesize = | alt = | caption = | category = Oxide mineral | formula = (Ti,Ca,Zr)O(2-x) | molweight = | strunz = 4.DL.05 | dana = | system = Isometric | class = Hexoctahedral (m{{overline|3}}m) H-M symbol: (4/m {{overline|3}} 2/m) | unit cell = a = 5.02 Å, Z = 4 | color = black, reddish brown | habit = Crystalline, metamict, pseudocubic | twinning = | cleavage = none | fracture = brittle | tenacity = | mohs = | luster = Resinous | streak = brownish grey | diaphaneity = Subtranslucent to opaque[1] | gravity = | density = 4.7 | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = | var3 = | var3text = | var4 = | var4text = | var5 = | var5text = | var6 = | var6text = }} Zirkelite is an oxide mineral with formula: (Ca,Th,Ce)Zr(Ti,Nb)2O7. It occurs as well-formed fine sized isometric crystals. It is a black, brown or yellow mineral with a hardness of 5.5 and a specific gravity of 4.7. Name and discoveryZirkelite was first discovered in Brazil in 1895. It was named for German petrographer Ferdinand Zirkel (1838–1912). OccurrenceInitial discovery was from the Jacupiranga carbonatite, Sao Paulo, Brazil. It is also found in Canada, Kazakhstan, Norway, Russia, South Africa, the United Kingdom, and the United States. References1. ^http://www.webmineral.com/data/Zirkelite.shtml#.VfLMJygViko
8 : Calcium minerals|Thorium minerals|Zirconium minerals|Titanium minerals|Niobium minerals|Lanthanide minerals|Cubic minerals|Oxide minerals |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。