{"id":11155,"date":"2022-05-23T12:11:43","date_gmt":"2022-05-23T04:11:43","guid":{"rendered":"https:\/\/jiehonggem.com\/?p=11155"},"modified":"2022-06-14T14:24:30","modified_gmt":"2022-06-14T06:24:30","slug":"gematata-chalcedony","status":"publish","type":"post","link":"https:\/\/jiehonggem.com\/gematata-chalcedony\/","title":{"rendered":"Chalcedony"},"content":{"rendered":"\n\n\n
\"\"
<\/figcaption><\/figure>\n\n\n\n

Description:<\/strong><\/p>chalcedony (kal-SED-uh-nee) is microcrystalline or cryptocrystalline quartz; hexagonal (trigonal) crystal system.<\/cite><\/blockquote>\n\n\n\n

Appearance:<\/strong><\/p>\u2022 semitransparent to opaque 
\u2022 virtually all colors<\/cite><\/blockquote>\n\n\n\n

Variety and Trade Names:<\/strong><\/p>milky chalcedony – semi transparent to translucent, nearly colorless or white
\u2022 chrysoprase – semi transparent to translucent, light to medium yellowish green (natural color)
\u2022 carnelian – semi transparent to translucent,yellow-orange to orangy red, brownish red or brownish orange
\u2022 bloodstone (heliotrope) – semitranslucent to opaque, dark green with red to brownish red spots
\u2022 prase – translucent to semitranslucent, with a generally darker, less saturated green than in chrysoprase
\u2022 agate – chalcedony with curved or angular bands or layers
\u2022 landscape agate, picture agate, fortification agate, etc – chalcedony with colored patterns resembling a landscape, etc.
\u2022 moss agate or mocha stone – chalcedony with green, black, or brown inclusions that look like moss
\u2022 onyx – chalcedony composed of straight, parallel layers of different colors
\u2022 sard – semitransparent to translucent, dark brownish red to brown to dark orange (darker and less saturated colors than those in carnelian)
\u2022 sardonyx – onyx showing bands of sard colors alternating with either white or black parallel bands
\u2022 carnelian onyx – onyx showing bands of carnelian colors alternating with either white or black parallel bands
\u2022  jasper – general variety term applied to semi translucent to opaque chalcedony of any color or combination of colors, except solid black or specially labeled material, such as bloodstone, onyx, etc.
\u2022 plasma – semitranslucent to opaque dark green with white or yellowish spots
\u2022 chrysocolla chalcedony or chrysocolla quartz – translucent to semitranslucent, intense light blue or blue-green; colored by the copper mineral chrysocolla
\u2022 petrified wood, agatized wood, silicified wood – wood that has been entirely replaced by chalcedony; it resembles a patterned jasper
\u2022 iris agate – semitransparent to translucent, with iridescent colors (phenomenon best seen on thin slices in transmitted light)
\u2022 fire agate – semitranslucent to opaque, with iridescent colors against a brown bodycolor
\u2022 dendritic agate – chalcedony with dark inclusions resembling tree branches
\u2022 amethystine chalcedony – semitranslucent to opaque purple; also marketed under the name damsonite<\/em><\/cite><\/blockquote>\n\n\n\n

Identification:<\/strong><\/p>Refractive Index: 1.577-1.583 (+-.017)
Cause of Color: usually chromium; some are colored by vanadium, or by both chromium and vanadium 
Specific Gravity: 2.72 (+.18,-.05) 
Hardness: 7 1\/2 to 8 ; Toughness: poor to good<\/cite><\/blockquote>\n\n\n\n

Stone Information from:<\/strong><\/p>Gem Reference Guide, by GIA, ISBN 0-87311-019-6
Gemstones of the world, Third Edition, by Walter Schumann, ISBN 1-4027-4016-6
https:\/\/www.gemdat.org\/gem-960.html
https:\/\/www.mindat.org\/min-960.html<\/cite><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

Description: chalcedony (kal-SED-uh-nee) is microcrystalline or cryptocrystalline quartz; hexagonal (trigonal) crystal system. Appearance: \u2022 semitransparent to opaque \u2022 virtually all colors Variety and Trade Names: milky chalcedony – semi transparent to translucent, nearly colorless or white\u2022 chrysoprase – semi transparent to translucent, light to medium yellowish green (natural color)\u2022 carnelian – semi transparent to translucent,yellow-orange to […]\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[405],"tags":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/jiehonggem.com\/wp-json\/wp\/v2\/posts\/11155"}],"collection":[{"href":"https:\/\/jiehonggem.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jiehonggem.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jiehonggem.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jiehonggem.com\/wp-json\/wp\/v2\/comments?post=11155"}],"version-history":[{"count":4,"href":"https:\/\/jiehonggem.com\/wp-json\/wp\/v2\/posts\/11155\/revisions"}],"predecessor-version":[{"id":12352,"href":"https:\/\/jiehonggem.com\/wp-json\/wp\/v2\/posts\/11155\/revisions\/12352"}],"wp:attachment":[{"href":"https:\/\/jiehonggem.com\/wp-json\/wp\/v2\/media?parent=11155"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jiehonggem.com\/wp-json\/wp\/v2\/categories?post=11155"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jiehonggem.com\/wp-json\/wp\/v2\/tags?post=11155"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}