dumortierite

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

GPTKB entity

Predicate	Object
gptkbp:instanceOf	granite
gptkbp:associatedMinerals	granite quartz topaz tourmaline andalusite kyanite sillimanite
gptkbp:birefringence	0.018–0.020
gptkbp:category	silicate mineral
gptkbp:chemicalFormula	Al7BO3(SiO4)3O3
gptkbp:cleavage	poor
gptkbp:color	blue brown gray green pink violet
gptkbp:crystalSystem	orthorhombic
gptkbp:discoveredIn	gptkb:France 1881
gptkbp:event	pegmatites aluminum-rich metamorphic rocks
gptkbp:fracture	splintery
gptkbp:hardnessMohs	7–8.5
https://www.w3.org/2000/01/rdf-schema#label	dumortierite
gptkbp:IMA_symbol	gptkb:Dum
gptkbp:luster	vitreous
gptkbp:namedAfter	gptkb:Eugène_Dumortier
gptkbp:opticalProperties	biaxial (+)
gptkbp:pleochroism	strong
gptkbp:radioactive	non-radioactive
gptkbp:refractiveIndex	1.68–1.72
gptkbp:solubility	insoluble in acids
gptkbp:specificGravity	3.3–3.4
gptkbp:streak	white
gptkbp:tenacity	brittle
gptkbp:transparency	translucent transparent
gptkbp:uses	gptkb:building granite porcelain production
gptkbp:bfsParent	gptkb:J._Dumortierite
gptkbp:bfsLayer	7