glaucochroite
noun
glau·cochro·ite
ˌglȯkəˈkrōˌīt,
glȯˈkäkrəˌwīt
plural -s
: a mineral CaMnSiO4 that consists of a calcium manganese silicate, occurs in bluish green prismatic crystals, and is related to monticellite
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Merriam-Webster unabridged
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