Assertion: tourmaline's chemical composition | /r/HasProperty | 7 - 7.5 density
Facets:
Source sentences:
text: Chemical Composition (NaCa)(LI,MgFe,Al)9B3Si6(O,OH)31 Hardness 7 - 7.5 Density 3.06 (.05, +.15)
text: Chemical Composition (NaCa)(LI,MgFe,Al)9B3Si6(O,OH)31 Hardness 7 - 7.5 Density 3.06 (.05, +.15)
text: Chemical Composition (NaCa)(LI,MgFe,Al)9B3Si6(O,OH)31 Hardness 7 - 7.5 Density 3.06 (.05, +.15)
text: Chemical Composition (NaCa)(LI,MgFe,Al)9B3Si6(O,OH)31 Hardness 7 - 7.5 Density 3.06 (.05, +.15)
text: Chemical Composition (NaCa)(LI,MgFe,Al)9B3Si6(O,OH)31 Hardness 7 - 7.5 Density 3.06 (.05, +.15)