tanzanite

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

GPTKB entity

Predicate	Object
gptkbp:instanceOf	granite
gptkbp:associatedMinerals	gptkb:diopside gptkb:tremolite granite graphite sulfides
gptkbp:birthstoneFor	December
gptkbp:category	granite
gptkbp:chemicalFormula	(Ca2Al3(SiO4)3(OH))
gptkbp:cleavage	perfect
gptkbp:color	blue purple violet
gptkbp:containsMineral	gptkb:zoisite
gptkbp:crystalSystem	orthorhombic
gptkbp:discoveredIn	gptkb:Merelani_Hills 1967
gptkbp:fluorescence	weak
gptkbp:foundIn	gptkb:Tanzania
gptkbp:fracture	conchoidal
gptkbp:hardnessMohs	6.5
gptkbp:heatTreatment	common
https://www.w3.org/2000/01/rdf-schema#label	tanzanite
gptkbp:luster	vitreous
gptkbp:marketedAs	gptkb:Tiffany_&_Co.
gptkbp:namedAfter	gptkb:Tanzania
gptkbp:opticalProperties	biaxial positive
gptkbp:pleochroism	strong
gptkbp:rarity	rare
gptkbp:refractiveIndex	1.69–1.70
gptkbp:source	gptkb:Merelani_Hills,_Tanzania
gptkbp:specificGravity	3.35
gptkbp:streak	white
gptkbp:tenacity	brittle
gptkbp:transparency	transparent
gptkbp:uses	gptkb:jewelry
gptkbp:bfsParent	gptkb:zoisite gptkb:German_Gemstone_Museum
gptkbp:bfsLayer	7