Chalcedony

URI: https://gptkb.org/entity/Chalcedony

GPTKB entity

Predicate	Object
gptkbp:instanceOf	granite
gptkbp:associatedMinerals	gptkb:Jasper gptkb:Quartz gptkb:jewelry gptkb:Calcite
gptkbp:category	Silicate mineral
gptkbp:chemicalFormula	SiO2
gptkbp:cleavage	nan
gptkbp:color	Varies (commonly white, blue, gray, or brown)
gptkbp:composition	gptkb:Silicon_dioxide
gptkbp:crystalSystem	Trigonal
gptkbp:density	2.59–2.61 g/cm³
gptkbp:event	Sedimentary rocks Hydrothermal veins Volcanic rocks
gptkbp:fluorescence	Varies, sometimes weak
gptkbp:fracture	Conchoidal
gptkbp:hardnessMohs	6–7
gptkbp:hasVariant	gptkb:Quartz
https://www.w3.org/2000/01/rdf-schema#label	Chalcedony
gptkbp:IMA_symbol	Chd
gptkbp:luster	Waxy
gptkbp:namedAfter	gptkb:Chalcedon_(ancient_town_in_Asia_Minor)
gptkbp:notableVariant	gptkb:Onyx gptkb:Carnelian gptkb:Chrysoprase gptkb:Moss_agate gptkb:Sard granite
gptkbp:opticalProperties	Uniaxial (+)
gptkbp:radioactive	Non-radioactive
gptkbp:refractiveIndex	1.530–1.540
gptkbp:relatedGroup	gptkb:Quartz
gptkbp:solubility	Insoluble in water
gptkbp:streak	White
gptkbp:structure	Cryptocrystalline
gptkbp:symbol	Chd
gptkbp:transparency	Translucent
gptkbp:uses	granite Ornamental stone
gptkbp:bfsParent	gptkb:Quartz gptkb:granite
gptkbp:bfsLayer	4