"(geology) the matrix of fine-grained crystalline material in which larger crystals are embedded"@en-us . . . "14891678-n"^^ . . . "114891678"^^ . "110682878"@en-us . "0"^^ . "0"^^ . . . "groundmass"@en-us . "groundmass"^^ . . . "114043270"@en-us . . .