periclase
noun
peri·clase
ˈperəˌklās,
-āz
variants
or periclasite
ˌperəˈklā|ˌsīt,
pəˈriklə|,
|ˌzīt
plural -s
: 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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