|
gptkbp:instanceOf
|
granite
|
|
gptkbp:birefringence
|
0.019
|
|
gptkbp:category
|
inosilicate
hydrous calcium aluminium silicate
|
|
gptkbp:chemicalFormula
|
CaAl2Si2O7(OH)2·H2O
|
|
gptkbp:cleavage
|
perfect
|
|
gptkbp:color
|
blue
gray
white
colorless
pink
|
|
gptkbp:crystalSystem
|
orthorhombic
|
|
gptkbp:discoveredIn
|
1895
|
|
gptkbp:event
|
blueschist facies rocks
high-pressure metamorphic rocks
|
|
gptkbp:firstDescribed
|
Tiburon Peninsula, Marin County, California, USA
|
|
gptkbp:habit
|
prismatic crystals
massive
granular
|
|
gptkbp:hardnessMohs
|
7.5
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Lawsonite
|
|
gptkbp:IMAStatus
|
approved mineral
|
|
gptkbp:luster
|
vitreous
|
|
gptkbp:namedAfter
|
gptkb:Andrew_Lawson
|
|
gptkbp:opticalProperties
|
biaxial (+)
|
|
gptkbp:radioactive
|
non-radioactive
|
|
gptkbp:refractiveIndex
|
nα = 1.665
nβ = 1.672
nγ = 1.684
|
|
gptkbp:solubility
|
insoluble in water
|
|
gptkbp:specificGravity
|
3.09
|
|
gptkbp:streak
|
white
|
|
gptkbp:symmetry
|
Cmcm
|
|
gptkbp:tenacity
|
brittle
|
|
gptkbp:transparency
|
translucent
transparent
|
|
gptkbp:bfsParent
|
gptkb:Sorosilicates
|
|
gptkbp:bfsLayer
|
7
|