Assertion: orthoclase | /r/HasProperty | potassium feldspar
Facets:
Source sentences:
text: True moonstone is orthoclase (potassium feldspar), rather than labradorite (plagioclase feldspar).
text: The presence of significant quartz makes the rock type quartz-diorite (>5% quartz) or tonalite (>20% quartz), and if orthoclase (potassium feldspar) is present at greater than 10 percent, the rock type grades into monzodiorite or granodiorite.