a hard glassy mineral that consists of a silicate of beryllium and occurs especially in rhombohedral crystals
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phenakitea hard glassy mineral that consists of a silicate of beryllium and occurs especially in rhombohedral crystals
phenacitea hard glassy mineral that consists of a silicate of beryllium and occurs especially in rhombohedral crystals
euclasea mineral that consists of a brittle silicate of beryllium and aluminum in pale yellow, green, or blue prismatic crystals and is used especially as a gemstone
analcimea white or slightly colored mineral that consists of hydrated silicate of sodium and aluminum and occurs in various igneous rocks in massive form or in crystals
beryla mineral consisting of a silicate of beryllium and aluminum of great hardness that occurs in colorless hexagonal prisms when pure and in various colors (as green, blue, yellow, or pink) when not pure, that is valued as a source of gems, and that is the principal source of beryllium
enstatiteA translucent crystalline mineral of varying colors that occurs in some igneous rocks and stony meteorites. It consists of magnesium silicate and is a member of the pyroxene group