|
gptkbp:instanceOf
|
granite
|
|
gptkbp:associatedMinerals
|
gptkb:chlorite
gptkb:calcite
gptkb:albite
quartz
|
|
gptkbp:birefringence
|
0.010–0.046
|
|
gptkbp:category
|
sorosilicate mineral
|
|
gptkbp:chemicalFormula
|
Ca2(Al,Fe)3(SiO4)3(OH)
|
|
gptkbp:cleavage
|
perfect on [001]
|
|
gptkbp:color
|
green
yellow-green
pistachio-green
|
|
gptkbp:crystalSystem
|
monoclinic
|
|
gptkbp:diaphaneity
|
transparent to translucent
|
|
gptkbp:discoveredBy
|
gptkb:René_Just_Haüy
|
|
gptkbp:discoveredIn
|
1801
|
|
gptkbp:event
|
metamorphic rocks
hydrothermal veins
|
|
gptkbp:foundIn
|
gptkb:Austria
gptkb:Italy
gptkb:Norway
gptkb:Pakistan
gptkb:Russia
gptkb:Switzerland
gptkb:United_States
|
|
gptkbp:fracture
|
uneven
|
|
gptkbp:habit
|
prismatic crystals
massive
granular
|
|
gptkbp:hardnessMohs
|
6–7
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Epidote
|
|
gptkbp:IMA_symbol
|
Epd
|
|
gptkbp:luster
|
vitreous
|
|
gptkbp:namedAfter
|
Greek word 'epidosis' (increase)
|
|
gptkbp:opticalProperties
|
biaxial (+)
|
|
gptkbp:pleochroism
|
strong
|
|
gptkbp:refractiveIndex
|
nα = 1.729–1.751
nβ = 1.750–1.773
nγ = 1.759–1.797
|
|
gptkbp:relatedGroup
|
gptkb:epidote_group
|
|
gptkbp:specificGravity
|
3.3–3.5
|
|
gptkbp:streak
|
grayish white
|
|
gptkbp:symmetry
|
P21/m
|
|
gptkbp:tenacity
|
brittle
|
|
gptkbp:transparency
|
translucent
transparent
|
|
gptkbp:uses
|
granite
collector's mineral
|
|
gptkbp:bfsParent
|
gptkb:Grossular_garnet
|
|
gptkbp:bfsLayer
|
5
|