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Conglomerate is a sedimentary rock which forms from rounded gravel and boulder sized clasts which are cemented together in a matrix
From Latin conglomeratus, to roll together, i.e. from com together + glomerare to gather into a ball, from glomus (genitive glomeris) a ball
Coarse Grained Rock, Opaque Rock
Litchfieldite is a rare igneous rock which is coarse-grained, foliated and a variety of nepheline syenite, sometimes also called as nepheline syenite gneiss or gneissic nepeheline syenite
From its occurrence at Litchfield, Maine, USA
Durable Rock, Medium Hardness Rock
Coarse Grained Rock, Opaque Rock