Tanzanite

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

GPTKB entity

Predicate	Object
gptkbp:instanceOf	granite
gptkbp:birefringence	0.008
gptkbp:birthstoneFor	December
gptkbp:category	granite
gptkbp:chemicalFormula	(Ca2Al3(SiO4)3(OH))
gptkbp:color	gptkb:Violet Blue Purple
gptkbp:containsMineral	gptkb:Epidote_group
gptkbp:crystalSystem	Orthorhombic
gptkbp:discoveredIn	gptkb:Merelani_Hills 1967
gptkbp:foundIn	gptkb:Tanzania
gptkbp:hardnessMohs	7 6.5
gptkbp:heatTreatment	gptkb:Common
https://www.w3.org/2000/01/rdf-schema#label	Tanzanite
gptkbp:luster	Vitreous
gptkbp:marketedAs	gptkb:Tiffany_&_Co.
gptkbp:mineralSpecies	gptkb:Zoisite
gptkbp:namedAfter	gptkb:Tanzania
gptkbp:officialGemstoneOf	gptkb:Tanzania
gptkbp:pleochroicColors	gptkb:Violet Blue Burgundy
gptkbp:pleochroism	Strong
gptkbp:rarity	Rare
gptkbp:refractiveIndex	1.69 1.70
gptkbp:source	gptkb:Merelani_Hills,_Tanzania
gptkbp:specificGravity	3.35
gptkbp:transparency	Transparent
gptkbp:uses	gptkb:jewelry
gptkbp:valuation	Rare
gptkbp:bfsParent	gptkb:Precious_Stone gptkb:Zoisite gptkb:Gem
gptkbp:bfsLayer	6