vaba süsinik plaatja (libleja) grafiidina; hallmalmi struktuuriosa (vt hallmalm; vrd kompaktgrafiit, keragrafiit, mügargrafiit), graphitic carbon, in the form of plates, occuring in the microstructure of a gray iron (see: gray cast iron; compare: compacted graphite, spheroidal graphite, nodular graphite)