Chalcedony: Béda antara owahan
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'''Chalcedony''' {{IPAc-en|k|æ|l|ˈ|s|ɛ|d|ə|n|i}} inggih menika satunggaling wujud ingkang sami tumpuk-tumpukan.<ref name="heany_1994">Heaney, Peter J., 1994. Structure and Chemistry of the low-pressure silica polymorphs. In: Reviews in Mineralogy v. 29; Silica: Physical Behavior, geochemistry and materials applications. Ed. Heaney, P.J., Prewitt, C.T., Gibbs, G.V., 1-40</ref> Kuarsa lan moganit menika kalebet mineral silika, ananging kuarsa menika kagungan perangan trigonal wondene ingkang moganit menika gadhah sifat ingkang monoklinik. Struktur kimia saking chalcedony inggih menika SiO<sub>2</sub>.
Nama ''chalcedony'' menika asalipun saking basa [[Latin]] ''chalcedonius'' (utawi ''calchedonius''). Istilah menika ingkang kaping sepisan wonten ing satunggaling karyanipun [[Pliny the Elder]], ''[[Naturalis Historia]]'' ingkang dipunginakaken kangge nyebat batuan Jaspis ingkang asifat transparan.<ref>Pliny the Elder: Naturalis Historiae, Book 37, chapter 7,115 ([http://books.google.de/books?id=oHlGAAAAYAAJ&dq=editions%3A2wxns2VZC7sC&hl=de&pg=RA1-PA163#v=onepage </ref>[[Chalcedon]] ingkang wonten ing [[Asia alit|Asia Cilik]].<ref>Erika Zwierlein-Diehl: Antike Gemmen und ihr Nachleben. Berlin (Verlag [[Walter de Gruyter]]) 2007, S. 307 ([http://books.google.de/books?id=OtaMtKzaKR8C&pg=PA307&lpg=PA307&dq=chalcedon+Plinius&source=bl&ots=xnCuPP5Hl8&sig=Ay5ipzitxzqb3KQLnUTICrmk1uo&hl=de&sa=X&ei=NsnkUMg-yNe0BueHgJgM&ved=0CDQQ6AEwAQ#v=onepage&q=chalcedon%20Plinius&f=false online]) According to the [[OED]] a connection with the town of Chalcedon is "very doubtful":{{OEtymD|Chalcedony}}</ref> Ananging istilah ''khalkedon'' (χαλκηδών) menika ugi medal wonten ing [[Book of Revelation]].<ref>{{cite book|title=The International Standard Bible Encyclopaedia|editor=James Orr|publisher=The Howard-Severance company|year=1915|chapter=''Chalkēdōn''|page=2859|url=http://books.google.com/?id=CqPNAAAAMAAJ&pg=PA2859&dq=chalcedony+Chalkedon#v=onepage&q=chalcedony%20Chalkedon&f=false}}</ref>
== Geokimia ==
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