|
gptkbp:instanceOf
|
granite
|
|
gptkbp:associatedMinerals
|
gptkb:Quartz
gptkb:Biotite
gptkb:Muscovite
|
|
gptkbp:birefringence
|
0.005–0.008
|
|
gptkbp:category
|
gptkb:Feldspar
|
|
gptkbp:chemicalFormula
|
KAlSi3O8
|
|
gptkbp:cleavage
|
Perfect
|
|
gptkbp:color
|
Gray
Green
Pink
White
|
|
gptkbp:crystalSystem
|
Monoclinic
|
|
gptkbp:danaclassification
|
61.01.03.01
|
|
gptkbp:density
|
2.56 g/cm³
|
|
gptkbp:discoveredIn
|
1801
|
|
gptkbp:event
|
gptkb:Pegmatite
Granite
Igneous rocks
|
|
gptkbp:fracture
|
Uneven
|
|
gptkbp:habit
|
Granular
Massive
Tabular crystals
|
|
gptkbp:hardnessMohs
|
6
|
|
gptkbp:hasVariant
|
gptkb:Sanidine
gptkb:Moonstone
gptkb:Adularia
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Orthoclase
|
|
gptkbp:IMA_symbol
|
gptkb:Or
|
|
gptkbp:luster
|
Vitreous
|
|
gptkbp:meltingPoint
|
1150°C
|
|
gptkbp:namedAfter
|
Greek for 'straight fracture'
|
|
gptkbp:opticalProperties
|
Biaxial (+)
|
|
gptkbp:radioactive
|
Non-radioactive
|
|
gptkbp:refractiveIndex
|
1.518–1.526
|
|
gptkbp:relatedGroup
|
gptkb:Potassium_feldspar
|
|
gptkbp:solubility
|
Insoluble in water
|
|
gptkbp:specificGravity
|
2.55–2.63
|
|
gptkbp:streak
|
White
|
|
gptkbp:Strunz_classification
|
9.FA.30
|
|
gptkbp:symmetry
|
C2/m
|
|
gptkbp:tenacity
|
Brittle
|
|
gptkbp:transparency
|
Transparent to translucent
|
|
gptkbp:uses
|
Ceramics
Glassmaking
Gemstone (moonstone)
|
|
gptkbp:bfsParent
|
gptkb:Precious_Stone
gptkb:Feldspar
gptkb:Gem
|
|
gptkbp:bfsLayer
|
6
|