hornblende

GPTKB entity

Statements (31)
Predicate Object
gptkbp:instanceOf granite
gptkbp:associatedMinerals gptkb:biotite
quartz
plagioclase
gptkbp:category inosilicate
gptkbp:chemicalFormula (Ca,Na)2-3(Mg,Fe,Al)5(Al,Si)8O22(OH)2
gptkbp:cleavage two directions at 56 and 124 degrees
gptkbp:color black
dark green
gptkbp:crystalSystem monoclinic
gptkbp:discoveredIn 1789
gptkbp:event metamorphic rocks
igneous rocks
gptkbp:foundIn granite
schist
diorite
gptkbp:fracture uneven
gptkbp:hardnessMohs 5-6
https://www.w3.org/2000/01/rdf-schema#label hornblende
gptkbp:luster vitreous
gptkbp:magnetType non-magnetic
gptkbp:namedAfter German: horn (horn) + blende (deceive)
gptkbp:opticalProperties biaxial (-)
gptkbp:radioactive non-radioactive
gptkbp:solubility insoluble in water
gptkbp:specificGravity 2.9-3.4
gptkbp:streak colorless
gptkbp:subclassOf gptkb:amphibole_group
gptkbp:uses rock-forming mineral
gptkbp:bfsParent gptkb:Almandine
gptkbp:bfsLayer 5