https://tcs.nju.edu.cn/wiki/api.php?action=feedcontributions&feedformat=atom&user=142.105.144.236TCS Wiki - User contributions [en]2026-05-26T19:22:57ZUser contributionsMediaWiki 1.45.3https://tcs.nju.edu.cn/wiki/index.php?title=Garnet&diff=7589Garnet2017-03-26T23:30:55Z<p>142.105.144.236: usage</p>
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<div>{{Infobox mineral<br />
| category = [[Silicate mineral|Nesosilicate]]<br />
| boxbgcolor = #FF9977<br />
| boxtextcolor = black<br />
| image = GarnetCrystalUSGOV.jpg<br />
| formula = The general formula <!--<br />
-->''X''<sub>3</sub>''Y''<sub>2</sub>(SiO<sub>4</sub>)<sub>3</sub><br />
| Z = 8<br />
| spacegroup = Ia3d<br />
| crystalclass = <math>4/m\bar{3} 2/m</math><br />
| color = virtually all colors, blue very rare<br />
| habit = [[Rhombic dodecahedron]] or cubic<br />
| cleavage = Indistinct<br />
| fracture = conchoidal to uneven<br />
| mohs = 6.5–7.5<br />
| luster = vitreous to resinous<br />
| polish = vitreous to subadamantine<ref name="GRG">[[Gemological Institute of America]], ''GIA Gem Reference Guide'' 1995, ISBN 0-87311-019-6</ref><br />
| refractive = 1.72–1.94<br />
| opticalprop = Single refractive, often anomalous double refractive<ref name="GRG"/><br />
| birefringence = None<br />
| pleochroism = None<br />
| streak = White<br />
| gravity = 3.1–4.3<br />
| fluorescence= variable<br />
| other = variable magnetic attraction<br />
| var1 = Pyrope | var1text = Mg<sub>3</sub>Al<sub>2</sub>Si<sub>3</sub>O<sub>12</sub><br />
| var2 = Almandine | var2text = Fe<sub>3</sub>Al<sub>2</sub>Si<sub>3</sub>O<sub>12</sub><br />
| var3 = Spessartine | var3text = Mn<sub>3</sub>Al<sub>2</sub>Si<sub>3</sub>O<sub>12</sub><br />
| var4 = Andradite | var4text = Ca<sub>3</sub>Fe<sub>2</sub>Si<sub>3</sub>O<sub>12</sub><br />
| var5 = Grossular | var5text = Ca<sub>3</sub>Al<sub>2</sub>Si<sub>3</sub>O<sub>12</sub><br />
| var6 = Uvarovite | var6text = Ca<sub>3</sub>Cr<sub>2</sub>Si<sub>3</sub>O<sub>12</sub><br />
}}<br />
A '''garnet''' {{IPAc-en|ˈ|ɡ|ɑr|n|ə|t}} is one kind of [[silicate]] mineral. There are many different kinds of garnets, containing different metals. [[Crystal]]s of garnet are often large and pretty. Their most common color is red or purple, but they can be found in almost all colors and are often used in jewelry. In the [[United States]], garnet is the birthstone for people born in the month of [[January]].<br />
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==Related pages==<br />
* [[List of minerals]]<br />
* [[List of birthstones]]<br />
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==Sources==<br />
{{reflist}}<br />
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==Further reading==<br />
*Hurlbut, Cornelius S.; Klein, Cornelis, 1985, ''Manual of Mineralogy'', 20th ed., Wiley, ISBN 0-471-80580-7<br />
*Color Encyclopedia of Gemstones ISBN 0-442-20333-0<br />
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==Other websites==<br />
{{Commons category}}<br />
*http://www.gemstonemagnetism.com contains a comprehensive section about garnets and garnet magnetism.<br />
*[http://minerals.usgs.gov/minerals/pubs/commodity/gemstones/sp14-95/garnet.html USGS Garnet locations – USA]<br />
*http://www.gemstone.org/gem-by-gem/english/garnet.html<br />
*http://www.mindat.org/min-10272.html<br />
* [http://blogs.loc.gov/law/2012/01/garnets/ Blog post on garnets on the [[Law Library of Congress]]'s blog]<br />
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{{Sci-stub}}<br />
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[[Category:Gemstones]]<br />
[[Category:Birthstones]]</div>142.105.144.236