Statements (28)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
granite
|
| gptkbp:category |
gptkb:amphibole
|
| gptkbp:chemicalFormula |
Na3(Fe2+4Fe3+)Si8O22(OH)2
|
| gptkbp:cleavage |
prismatic
|
| gptkbp:color |
black
greenish-black |
| gptkbp:crystalSystem |
monoclinic
|
| gptkbp:density |
3.3-3.5 g/cm3
|
| gptkbp:discoveredIn |
gptkb:Sweden
|
| gptkbp:event |
gptkb:syenites
pegmatites alkaline igneous rocks |
| gptkbp:hardnessMohs |
5.5-6
|
| https://www.w3.org/2000/01/rdf-schema#label |
arfvedsonite
|
| gptkbp:IMAStatus |
approved mineral
|
| gptkbp:luster |
vitreous
|
| gptkbp:namedAfter |
gptkb:Johan_August_Arfvedson
|
| gptkbp:opticalProperties |
biaxial (-)
|
| gptkbp:pleochroism |
strong
|
| gptkbp:refractiveIndex |
nα = 1.630–1.650
nβ = 1.680–1.700 nγ = 1.700–1.720 |
| gptkbp:streak |
gray
|
| gptkbp:symmetry |
C2/m
|
| gptkbp:tenacity |
brittle
|
| gptkbp:transparency |
translucent to opaque
|
| gptkbp:bfsParent |
gptkb:amphibole
|
| gptkbp:bfsLayer |
6
|