Statements (34)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
mineral group
|
| gptkbp:chemicalFormula |
(Na,Ca)(Si,Al)4O8
|
| gptkbp:cleavage |
perfect on {001}
|
| gptkbp:color |
gray
white bluish |
| gptkbp:contains |
gptkb:oligoclase
gptkb:albite anorthite andesine bytownite labradorite |
| gptkbp:crystalSystem |
triclinic
|
| gptkbp:discoveredBy |
19th century
|
| gptkbp:etymology |
from Greek 'plagios' (oblique) and 'klasis' (fracture)
|
| gptkbp:fracture |
uneven
|
| gptkbp:hardnessMohs |
6–6.5
|
| https://www.w3.org/2000/01/rdf-schema#label |
Plagioclase feldspar
|
| gptkbp:luster |
vitreous
|
| gptkbp:memberOf |
tectosilicates
|
| gptkbp:namedFor |
gptkb:Johann_Friedrich_Christian_Hessel
|
| gptkbp:occurredIn |
metamorphic rocks
sedimentary rocks igneous rocks |
| gptkbp:opticalProperties |
biaxial (-)
|
| gptkbp:specificGravity |
2.62–2.76
|
| gptkbp:streak |
white
|
| gptkbp:subclassOf |
feldspar
|
| gptkbp:uses |
gptkb:ceramics
glassmaking geological indicator |
| gptkbp:bfsParent |
gptkb:Albite
gptkb:Andesite |
| gptkbp:bfsLayer |
6
|