|
gptkbp:instanceOf
|
granite
|
|
gptkbp:associatedMinerals
|
gptkb:benitoite
gptkb:natrolite
aegirine
|
|
gptkbp:birefringence
|
0.029
|
|
gptkbp:category
|
inosilicate
|
|
gptkbp:chemicalFormula
|
KNa2Li(Fe2+,Mn2+)2Ti2Si8O24
|
|
gptkbp:cleavage
|
perfect on {100}
|
|
gptkbp:color
|
black
reddish brown
deep red
|
|
gptkbp:containsElement
|
iron
oxygen
manganese
potassium
sodium
silicon
titanium
lithium
|
|
gptkbp:crystalHabit
|
prismatic crystals
|
|
gptkbp:crystalSystem
|
monoclinic
|
|
gptkbp:firstDescribed
|
1893
|
|
gptkbp:fracture
|
conchoidal
|
|
gptkbp:hardnessMohs
|
5-6
|
|
gptkbp:hasVariant
|
gptkb:mangan-neptunite
gptkb:watatsumiite
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
neptunite
|
|
gptkbp:IMAStatus
|
approved mineral
|
|
gptkbp:location
|
gptkb:San_Benito_County,_California,_USA
|
|
gptkbp:luster
|
vitreous
|
|
gptkbp:namedAfter
|
gptkb:Neptune
|
|
gptkbp:opticalProperties
|
biaxial (+)
|
|
gptkbp:pleochroism
|
strong
|
|
gptkbp:radioactive
|
non-radioactive
|
|
gptkbp:refractiveIndex
|
nα = 1.690–1.696
nβ = 1.692–1.700
nγ = 1.719–1.724
|
|
gptkbp:relatedGroup
|
gptkb:neptunite_group
|
|
gptkbp:specificGravity
|
3.19-3.23
|
|
gptkbp:streak
|
brownish yellow
|
|
gptkbp:tenacity
|
brittle
|
|
gptkbp:transparency
|
transparent to translucent
|
|
gptkbp:uses
|
collector's mineral
gemstone (rarely)
|
|
gptkbp:bfsParent
|
gptkb:Benitoite
|
|
gptkbp:bfsLayer
|
5
|