|
gptkbp:instanceOf
|
granite
|
|
gptkbp:birefringence
|
0.006 to 0.007
|
|
gptkbp:category
|
silicate mineral
|
|
gptkbp:chemicalFormula
|
CaB2(SiO4)2
|
|
gptkbp:cleavage
|
poor
|
|
gptkbp:color
|
brown
gray
white
yellow
colorless
pink
|
|
gptkbp:crystalSystem
|
orthorhombic
|
|
gptkbp:diaphaneity
|
translucent
transparent
|
|
gptkbp:discoveredIn
|
gptkb:Danbury,_Connecticut
|
|
gptkbp:event
|
limestone
hydrothermal veins
contact metamorphic rocks
granite pegmatites
|
|
gptkbp:firstDescribed
|
1839
|
|
gptkbp:fluorescence
|
may fluoresce under UV light
|
|
gptkbp:fracture
|
conchoidal
|
|
gptkbp:habit
|
prismatic crystals
massive
|
|
gptkbp:hardnessMohs
|
7 to 7.5
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Danburite
|
|
gptkbp:IMA_symbol
|
gptkb:Dnb
|
|
gptkbp:luster
|
vitreous
|
|
gptkbp:mainConstituent
|
oxygen
boron
calcium
silicon
|
|
gptkbp:namedAfter
|
gptkb:Danbury,_Connecticut
|
|
gptkbp:notablePlace
|
gptkb:Japan
gptkb:Madagascar
gptkb:Mexico
gptkb:Myanmar
gptkb:Russia
gptkb:United_States
|
|
gptkbp:refractiveIndex
|
1.627 to 1.636
|
|
gptkbp:relatedGroup
|
gptkb:danburite_group
|
|
gptkbp:specificGravity
|
2.97 to 3.03
|
|
gptkbp:streak
|
white
|
|
gptkbp:symmetry
|
Pnam
|
|
gptkbp:tenacity
|
brittle
|
|
gptkbp:transparency
|
translucent
transparent
|
|
gptkbp:uses
|
granite
|
|
gptkbp:bfsParent
|
gptkb:Precious_Stone
gptkb:Gem
|
|
gptkbp:bfsLayer
|
6
|