'''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 peranganpérangan trigonal wondenewondéné ingkang moganit menika gadhah sifatsipat 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 sepisansapisan wonten ing satunggaling karyanipun [[Pliny the Elder]], ''[[Naturalis Historia]]'' ingkang dipunginakakendipun-ginakaken kanggé nyebat batuan Jaspis ingkang asifatasipat transparan.<ref>[http://books.google.de/books?id=oHlGAAAAYAAJ&dq=editions%3A2wxns2VZC7sC&hl=de&pg=RA1-PA163#v=onepage Pliny the Elder: Naturalis Historiae, Book 37, chapter 7,115 (]</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 ==
=== Struktur ===
Chalcedony menika natenaté dipunwastani minangka kriptokristalin kuarsa ingkang gadhah kandhutan serat<ref>Chalcedony mineral information and data. http://www.mindat.org/min-960.html</ref> ananging samenika dipunmangertosi bilih chalcedony menika ugi gadhah sifatsipat ingkang polimorf amargi wonten moganit wonten ing salebeting chalsedony kasebat.<ref name="heany_1994" /><ref>Origlieri, Marcus. "Moganite: a New Mineral -- Not!" Lithosphere (1994). Aug. 2007 <http://fgms.home.att.net/moganite.htm>.</ref><ref>Nickel, Ernest H., and Monte C. Nichols. "IMA/CNMNC List of Mineral Names." Materials Data. June 2007. Aug. 2007 <http://www.geo.vu.nl/users/ima-cnmmn/MINERALlist.pdf></ref> Kadar moganit ing satunggal sampel chalcedony manekamanéka werna, Padatanipun ing antawisipun 5 dumugi 20 persenpersèn.<ref name="heany_1992">Heaney, Peter J., and Jeffrey E. Post. "The Widespread Distribution of a Novel Silica Polymorph in Microcrystalline Quartz Varieties." Science ns 255 (1992): 441-443. JSTOR. Aug. 2007. Keyword: moganite</ref>
=== Kelarutan ===
Sinaosa gadhah senyawa kimia ingkang mempermèmper kaliyan kuarsa, ananging chalcedony menika gadhah sifatsipat langkung larut tinimbang kaliyan kuarsa wonten ing temperaturtèmperatur ingkang andhap. Bab menika saged amargi kristal chalcedony menika langkung alus satemah gadhah rasio wiyaring permukaan lan volume ingkang langkung inggil ingkang dipunprakirakaken amargi wontenipun moganit.<ref name="heany_1992" />
