|
gptkbp:instanceOf
|
Mineral group
|
|
gptkbp:associatedMinerals
|
gptkb:Hornblende
gptkb:Quartz
gptkb:Mica
gptkb:Plagioclase_Feldspar
|
|
gptkbp:category
|
Tectosilicate
|
|
gptkbp:chemicalFormula
|
(K,Na)AlSi3O8
|
|
gptkbp:cleavage
|
Perfect
|
|
gptkbp:color
|
gptkb:Cream
Pink
Red
White
|
|
gptkbp:containsElement
|
gptkb:Oxygen
Aluminum
Potassium
Sodium
Silicon
|
|
gptkbp:containsMineral
|
gptkb:Microcline
gptkb:Sanidine
gptkb:Orthoclase
gptkb:Anorthoclase
|
|
gptkbp:crystalSystem
|
Monoclinic
Triclinic
|
|
gptkbp:density
|
2.55–2.63 g/cm³
|
|
gptkbp:discoveredBy
|
gptkb:Johann_Friedrich_Christian_Hessel
|
|
gptkbp:discoveredIn
|
1826
|
|
gptkbp:fracture
|
Uneven
|
|
gptkbp:hardnessMohs
|
6
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Alkali Feldspar
|
|
gptkbp:luster
|
Vitreous
|
|
gptkbp:meltingPoint
|
1150–1250 °C
|
|
gptkbp:occurredIn
|
Igneous rocks
Metamorphic rocks
Sedimentary rocks
|
|
gptkbp:opticalProperties
|
Biaxial (+/-)
|
|
gptkbp:refractiveIndex
|
1.518–1.540
|
|
gptkbp:solubility
|
Insoluble in water
|
|
gptkbp:streak
|
White
|
|
gptkbp:subclassOf
|
gptkb:Feldspar
|
|
gptkbp:transparency
|
Transparent to translucent
|
|
gptkbp:twins
|
gptkb:Baveno
Carlsbad
Pericline
|
|
gptkbp:usedFor
|
Ceramics
Glassmaking
Fillers
Abrasives
|
|
gptkbp:bfsParent
|
gptkb:Alkali_Feldspar_Granite
|
|
gptkbp:bfsLayer
|
7
|