|
gptkbp:instanceOf
|
granite
|
|
gptkbp:2V_angle
|
36–50°
|
|
gptkbp:approvedBy
|
gptkb:International_Mineralogical_Association
|
|
gptkbp:associatedMinerals
|
gptkb:apophyllite
gptkb:heulandite
gptkb:calcite
laumontite
|
|
gptkbp:birefringence
|
0.018
|
|
gptkbp:category
|
zeolite
|
|
gptkbp:chemicalFormula
|
NaCa4(Si27Al9)O72·28H2O
|
|
gptkbp:cleavage
|
perfect
|
|
gptkbp:color
|
brown
red
white
yellow
colorless
pink
|
|
gptkbp:crystalSystem
|
monoclinic
|
|
gptkbp:discoveredIn
|
1818
|
|
gptkbp:event
|
hydrothermal veins
basaltic volcanic rocks
|
|
gptkbp:fracture
|
uneven
|
|
gptkbp:habit
|
tabular crystals
fibrous masses
sheaf-like aggregates
|
|
gptkbp:hardnessMohs
|
3.5–4
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
stilbite-Ca
|
|
gptkbp:IMA_symbol
|
gptkb:Stb-Ca
|
|
gptkbp:luster
|
vitreous
pearly
|
|
gptkbp:namedAfter
|
Greek stilbein (to shine)
|
|
gptkbp:opticalProperties
|
biaxial (+)
|
|
gptkbp:radioactive
|
non-radioactive
|
|
gptkbp:refractiveIndex
|
nα = 1.479–1.494
nβ = 1.485–1.499
nγ = 1.497–1.507
|
|
gptkbp:relatedGroup
|
gptkb:stilbite_group
|
|
gptkbp:solubility
|
insoluble in water
|
|
gptkbp:spaceGroup
|
C2/m
|
|
gptkbp:specificGravity
|
2.1–2.2
|
|
gptkbp:streak
|
white
|
|
gptkbp:symmetry
|
monoclinic 2/m
|
|
gptkbp:transparency
|
translucent
transparent
|
|
gptkbp:uses
|
collector's mineral
zeolite applications
|
|
gptkbp:bfsParent
|
gptkb:stilbite
|
|
gptkbp:bfsLayer
|
7
|