peri·clase
| \ ˈperəˌklās, -āz \
variants:
or periclasite \
ˌperəˈklā|ˌsīt , pəˈriklə| , |ˌzīt
\
plural -s
Definition of periclase
: native magnesia MgO in granular forms or isometric crystals (hardness 6, specific gravity 3.67–3.90)
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Merriam-Webster unabridged
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