Common Opal

GPTKB entity

Statements (46)
Predicate Object
gptkbp:instanceOf granite
gptkbp:category Silicate mineral
gptkbp:chemicalFormula SiO2·nH2O
gptkbp:cleavage nan
gptkbp:color Black
Brown
Green
Red
White
Yellow
gptkbp:containsMineral Opal group
gptkbp:crystalSystem gptkb:Amorphous
gptkbp:diaphaneity Translucent
Opaque
gptkbp:distinctionFromPreciousOpal Lacks play-of-color
gptkbp:event Worldwide
gptkbp:fracture Conchoidal
gptkbp:hardnessMohs 5.5–6.5
https://www.w3.org/2000/01/rdf-schema#label Common Opal
gptkbp:luster Vitreous
Pearly
gptkbp:notablePlace gptkb:Australia
gptkb:Brazil
gptkb:Ethiopia
gptkb:Mexico
gptkb:Slovakia
gptkb:United_States
gptkbp:notableVariant Geyserite
Hyalite
Menilite
Milk opal
Moss opal
Resin opal
Wood opal
gptkbp:otherName Potch
gptkbp:refractiveIndex 1.37–1.52
gptkbp:solubility Insoluble in water
gptkbp:specificGravity 1.98–2.25
gptkbp:streak White
gptkbp:tenacity Brittle
gptkbp:transparency Translucent
Opaque
gptkbp:uses granite
Ornamental stone
gptkbp:bfsParent gptkb:Australian_Opals
gptkbp:bfsLayer 7