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- Age of the Earth (20052 bytes)
1: ...the age of the [[solar system]]. It is clear from zircons that the Earth is at least 4.404 billion years o...
8: == First concepts ==
25: ...h a short age for the Earth. Biologists could accept that the Earth might have a finite age, but even ...
27: ...mates would prove far too short. Thomson had attempted to root the debate in one set of facts; the geo...
37: ...ident of himself, and the fact that multiple attempts to determine the age of the Earth seemed to show... - Slate (1151 bytes)
5: ..., [[kaolin]], [[magnetite]], [[tourmaline]], or [[zircon]]. - List of minerals (11610 bytes)
134: #[[Chalcedony]] (cryptocrystalline variety of quartz)
151: #[[Dioptase]]
442: #[[Sapphire]] (gem corundum of any color except red, especially blue varieties)
550: #[[Zircon]]
551: #[[Zirconolite]] - Sedimentary rock (7917 bytes)
28: ...ommon igneous rock forming minerals (with the exception of quartz which is very resistant) are changed...
34: ...chanical and chemical breakdown such as quartz, [[zircon]], [[rutile]], and [[magnetite]]. Quartz is one o... - Hafnium (9162 bytes)
7: | rowspan="3" valign="center" | [[Zirconium|Zr]]<br>'''Hf'''<br>[[Rutherfordium|Rf]] ...
115: | [[electron capture|ε]]
154: ...ndard temperature and pressure|STP]] are used except where noted.</font>
156: ...esembles [[zirconium]] chemically and is found in zirconium [[mineral]]s. Hafnium is used in [[tungsten]] ...
160: ...notable difference between them is their density (zirconium is about half as dense as hafnium). - Zirconium (9876 bytes)
5: ...lspan="2" align="center" | [[yttrium]] – '''zirconium''' – [[niobium]]
17: | Zirconium, Zr, 40
46: | <nowiki>[</nowiki>[[Krypton|Kr]]<nowiki>]</nowiki>4d<sup>2</sup>5[[s-orbita...
157: ...ndard temperature and pressure|STP]] are used except where noted.</font>
159: ... from [[zircon]] and is very corrosion resistant. Zirconium is primarily used in [[nuclear reactor]]s for ... - Timeline of chemical element discovery (10490 bytes)
48: ...ed by [[Martin Heinrich Klaproth]]. Named from [[Zircon]] (mineral).
115: ... κρυπτός ''kryptos'' (hidden).
133: **[[Neptunium]] discovered by [[E.M. McMillan]] & [[Philip... - Sedimentary rocks (7917 bytes)
28: ...ommon igneous rock forming minerals (with the exception of quartz which is very resistant) are changed...
34: ...chanical and chemical breakdown such as quartz, [[zircon]], [[rutile]], and [[magnetite]]. Quartz is one o... - Gemstone (7411 bytes)
9: ...certain [[luminescence]] and a distinctive [[absorption spectrum]].
14: ...one beautiful or desirable are colour, unusual [[optical phenomena]] within the stone, an interesting ...
18: ...y in gem quality that they are scarcely known except to connoisseurs. Here are included andalusite, a...
24: ...hetic artificial diamond substitute composed of [[zirconium]] oxide. The imitations copy the look and colo...
56: *[[Zircon]]
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